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Design Space Exploration And Performance Modelling Of Advanced Turbofan And Open Rotor Engines
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Book Synopsis Design Space Exploration and Performance Modelling of Advanced Turbofan and Open-rotor Engines by : Panagiotis Giannakakis
Download or read book Design Space Exploration and Performance Modelling of Advanced Turbofan and Open-rotor Engines written by Panagiotis Giannakakis and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This work focuses on the current civil engine design practice of increasing overall pressure ratio, turbine entry temperature and bypass ratio, and on the technologies required in order to sustain it. In this context, this thesis contributes towards clarifying the following gray aspects of future civil engine development: the connection between an aircraft application, the engine thermodynamic cycle and the advanced technologies of variable area fan nozzle and fan drive gearbox. the connection between the engine thermodynamic cycle and the fuel consumption penalties of extracting bleed or power in order to satisfy the aircraft needs. the scaling of propeller maps in order to enable extensive open-rotor studies similar to the ones carried out for turbofan engines. The rst two objectives are tackled by implementing a preliminary design framework, which comprises models that calculate the engine uninstalled performance, dimensions, weight, drag and installed performance. The framework produces designs that are in good agreement with current and near future civil engines. The need for a variable area fan nozzle is related to the fan surge margin at take-o , while the transition to a geared architecture is identi ed by tracking the variation of the low pressure turbine number of stages. The results show that the above enabling technologies will be prioritised for long range engines, due to their higher overall pressure ratio, higher bypass ratio and lower speci c thrust. The analysis also shows that future lower speci c thrust engines will su er from higher secondary power extraction penalties. A propeller modelling and optimisation method is created in order to accomplish the open-rotor aspect of this work. The propeller model follows the lifting-line approach and is found to perform well against experimental data available for the SR3 prop-fan. The model is used in order to predict the performance of propellers with the same distribution of airfoils and sweep, but with di erent design point power coe cient and advance ratio. The results demonstrate that all the investigated propellers can be modelled by a common map, which separately determines the ideal and viscous losses.
Book Synopsis Performance and Weight Estimates for an Advanced Open Rotor Engine by : Nasa Technical Reports Server (Ntrs)
Download or read book Performance and Weight Estimates for an Advanced Open Rotor Engine written by Nasa Technical Reports Server (Ntrs) and published by BiblioGov. This book was released on 2013-07 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: NASA s Environmentally Responsible Aviation Project and Subsonic Fixed Wing Project are focused on developing concepts and technologies which may enable dramatic reductions to the environmental impact of future generation subsonic aircraft. The open rotor concept (also historically referred to an unducted fan or advanced turboprop) may allow for the achievement of this objective by reducing engine fuel consumption. To evaluate the potential impact of open rotor engines, cycle modeling and engine weight estimation capabilities have been developed. The initial development of the cycle modeling capabilities in the Numerical Propulsion System Simulation (NPSS) tool was presented in a previous paper. Following that initial development, further advancements have been made to the cycle modeling and weight estimation capabilities for open rotor engines and are presented in this paper. The developed modeling capabilities are used to predict the performance of an advanced open rotor concept using modern counter-rotating propeller designs. Finally, performance and weight estimates for this engine are presented and compared to results from a previous NASA study of advanced geared and direct-drive turbofans.
Book Synopsis Advanced Control of Turbofan Engines by : Hanz Richter
Download or read book Advanced Control of Turbofan Engines written by Hanz Richter and published by Springer Science & Business Media. This book was released on 2011-10-20 with total page 275 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advanced Control of Turbofan Engines describes the operational performance requirements of turbofan (commercial) engines from a controls systems perspective, covering industry-standard methods and research-edge advances. This book allows the reader to design controllers and produce realistic simulations using public-domain software like CMAPSS: Commercial Modular Aero-Propulsion System Simulation, whose versions are released to the public by NASA. The scope of the book is centered on the design of thrust controllers for both steady flight and transient maneuvers. Classical control theory is not dwelled on, but instead an introduction to general undergraduate control techniques is provided. Advanced Control of Turbofan Engines is ideal for graduate students doing research in aircraft engine control and non-aerospace oriented control engineers who need an introduction to the field.
Author :National Aeronautics and Space Adm Nasa Publisher :Independently Published ISBN 13 :9781794399808 Total Pages :24 pages Book Rating :4.3/5 (998 download)
Book Synopsis Updated Assessment of an Open Rotor Airplane Using an Advanced Blade Design by : National Aeronautics and Space Adm Nasa
Download or read book Updated Assessment of an Open Rotor Airplane Using an Advanced Blade Design written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2019-01-22 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Application of open rotor propulsion systems (historically referred to as "advanced turboprops" or "propfans") to subsonic transport aircraft received significant attention and research in the 1970s and 1980s when fuel efficiency was the driving focus of aeronautical research. Recent volatility in fuel prices and concern for aviation's environmental impact have renewed interest in open rotor propulsion, and revived research by NASA and a number of engine manufacturers. Over the last few years, NASA has revived and developed analysis capabilities to assess aircraft designs with open rotor propulsion systems. These efforts have been described in several previous papers along with initial results from applying these capabilities. The initial results indicated that open rotor engines have the potential to provide large reductions in fuel consumption and emissions. Initial noise analysis indicated that current noise regulations can be met with modern baseline blade designs. Improved blades incorporating low-noise features are expected to result in even lower noise levels. This paper describes improvements to the initial assessment, plus a follow-on study using a more advanced open rotor blade design to power the advanced singleaisle transport. The predicted performance and environmental results of these two advanced open rotor concepts are presented and compared. Hendricks, Eric S. and Berton, Jeffrey J. and Haller, William J. and Tong, Michael T. and Guynn, Mark D. Glenn Research Center; Langley Research Center NASA/TM-2013-218074, E-18749, AIAA Paper 2013-3628
Author :National Aeronautics and Space Adm Nasa Publisher :Independently Published ISBN 13 :9781793958600 Total Pages :38 pages Book Rating :4.9/5 (586 download)
Book Synopsis Refined Exploration of Turbofan Design Options for an Advanced Single-Aisle Transport by : National Aeronautics and Space Adm Nasa
Download or read book Refined Exploration of Turbofan Design Options for an Advanced Single-Aisle Transport written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2019-01-13 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive exploration of the turbofan engine design space for an advanced technology single-aisle transport (737/A320 class aircraft) was conducted previously by the authors and is documented in a prior report. Through the course of that study and in a subsequent evaluation of the approach and results, a number of enhancements to the engine design ground rules and assumptions were identified. A follow-on effort was initiated to investigate the impacts of these changes on the original study results. The fundamental conclusions of the prior study were found to still be valid with the revised engine designs. The most significant impact of the design changes was a reduction in the aircraft weight and block fuel penalties incurred with low fan pressure ratio, ultra-high bypass ratio designs. This enables lower noise levels to be pursued (through lower fan pressure ratio) with minor negative impacts on aircraft weight and fuel efficiency. Regardless of the engine design selected, the results of this study indicate the potential for the advanced aircraft to realize substantial improvements in fuel efficiency, emissions, and noise compared to the current vehicles in this size class. Guynn, Mark D. and Berton, Jeffrey J. and Fisher, Kenneth L. and Haller, William J. and Tong, Michael T. and Thurman, Douglas R. Glenn Research Center; Langley Research Center NASA/TM-2011-216883, L-19970, NF1676L-12004
Author :National Aeronautics and Space Adm Nasa Publisher :Independently Published ISBN 13 :9781794074804 Total Pages :44 pages Book Rating :4.0/5 (748 download)
Book Synopsis Performance and Environmental Assessment of an Advanced Aircraft with Open Rotor Propulsion by : National Aeronautics and Space Adm Nasa
Download or read book Performance and Environmental Assessment of an Advanced Aircraft with Open Rotor Propulsion written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2019-01-14 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Application of high speed, advanced turboprops, or "propfans," to transonic transport aircraft received significant attention during the 1970s and 1980s when fuel efficiency was the driving focus of aeronautical research. Unfortunately, after fuel prices declined sharply there was no longer sufficient motivation to continue maturing this technology. Recent volatility in fuel prices and increasing concern for aviation s environmental impact, however, have renewed interest in unducted, open rotor propulsion. Because of the renewed interest in open rotor propulsion, the lack of publicly available up-to-date studies assessing its benefits, and NASA s focus on reducing fuel consumption, a preliminary aircraft system level study on open rotor propulsion was initiated to inform decisions concerning research in this area. New analysis processes were established to assess the characteristics of open rotor aircraft. These processes were then used to assess the performance, noise, and emissions characteristics of an advanced, single-aisle aircraft using open rotor propulsion. The results of this initial study indicate open rotor engines have the potential to provide significant reductions in fuel consumption and landing-takeoff cycle NOX emissions. Noise analysis of the study configuration indicates that an open rotor aircraft in the single-aisle class would be able to meet current noise regulations with margin. NASA/TM-2012-217772, L-20189, NF1676L-15385 Guynn, Mark D. and Berton, Jeffrey J. and Haller, William J. and Hendricks, Eric S. and Tong, Michael T. Glenn Research Center; Langley Research Center
Author :Andreas Linke-Diesinger Publisher :Springer Science & Business Media ISBN 13 :3540736190 Total Pages :239 pages Book Rating :4.5/5 (47 download)
Book Synopsis Systems of Commercial Turbofan Engines by : Andreas Linke-Diesinger
Download or read book Systems of Commercial Turbofan Engines written by Andreas Linke-Diesinger and published by Springer Science & Business Media. This book was released on 2008-05-21 with total page 239 pages. Available in PDF, EPUB and Kindle. Book excerpt: To understand the operation of aircraft gas turbine engines, it is not enough to know the basic operation of a gas turbine. It is also necessary to understand the operation and the design of its auxiliary systems. This book fills that need by providing an introduction to the operating principles underlying systems of modern commercial turbofan engines and bringing readers up to date with the latest technology. It also offers a basic overview of the tubes, lines, and system components installed on a complex turbofan engine. Readers can follow detailed examples that describe engines from different manufacturers. The text is recommended for aircraft engineers and mechanics, aeronautical engineering students, and pilots.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721593279 Total Pages :34 pages Book Rating :4.5/5 (932 download)
Book Synopsis Development of a Turbofan Engine Simulation in a Graphical Simulation Environment by : National Aeronautics and Space Administration (NASA)
Download or read book Development of a Turbofan Engine Simulation in a Graphical Simulation Environment written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-20 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper presents the development of a generic component level model of a turbofan engine simulation with a digital controller, in an advanced graphical simulation environment. The goal of this effort is to develop and demonstrate a flexible simulation platform for future research in propulsion system control and diagnostic technology. A previously validated FORTRAN-based model of a modern, high-performance, military-type turbofan engine is being used to validate the platform development. The implementation process required the development of various innovative procedures, which are discussed in the paper. Open-loop and closed-loop comparisons are made between the two simulations. Future enhancements that are to be made to the modular engine simulation are summarized. Parker, Khary I. and Guo, Ten-Heui Glenn Research Center NASA/TM-2003-212543, E-14109, NAS 1.15:212543
Book Synopsis Advanced Turboprop Project by : Roy D. Hager
Download or read book Advanced Turboprop Project written by Roy D. Hager and published by . This book was released on 1988 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Refined Exploration of Turbofan Design Options for an Advanced Single-Aisle Transport by : Nasa Technical Reports Server (Ntrs)
Download or read book Refined Exploration of Turbofan Design Options for an Advanced Single-Aisle Transport written by Nasa Technical Reports Server (Ntrs) and published by BiblioGov. This book was released on 2013-07 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive exploration of the turbofan engine design space for an advanced technology single-aisle transport (737/A320 class aircraft) was conducted previously by the authors and is documented in a prior report. Through the course of that study and in a subsequent evaluation of the approach and results, a number of enhancements to the engine design ground rules and assumptions were identified. A follow-on effort was initiated to investigate the impacts of these changes on the original study results. The fundamental conclusions of the prior study were found to still be valid with the revised engine designs. The most significant impact of the design changes was a reduction in the aircraft weight and block fuel penalties incurred with low fan pressure ratio, ultra-high bypass ratio designs. This enables lower noise levels to be pursued (through lower fan pressure ratio) with minor negative impacts on aircraft weight and fuel efficiency. Regardless of the engine design selected, the results of this study indicate the potential for the advanced aircraft to realize substantial improvements in fuel efficiency, emissions, and noise compared to the current vehicles in this size class.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721033997 Total Pages :56 pages Book Rating :4.0/5 (339 download)
Book Synopsis Ultra Efficient Engine Technology Systems Integration and Environmental Assessment by : National Aeronautics and Space Administration (NASA)
Download or read book Ultra Efficient Engine Technology Systems Integration and Environmental Assessment written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-12 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study documents the design and analysis of four types of advanced technology commercial transport airplane configurations (small, medium large and very large) with an assumed technology readiness date of 2010. These airplane configurations were used as a platform to evaluate the design concept and installed performance of advanced technology engines being developed under the NASA Ultra Efficient Engine Technology (UEET) program. Upon installation of the UEET engines onto the UEET advanced technology airframes, the small and medium airplanes both achieved an additional 16% increase in fuel efficiency when using GE advanced turbofan engines. The large airplane achieved an 18% increase in fuel efficiency when using the P&W geared fan engine. The very large airplane (i.e. BWB), also using P&W geared fan engines, only achieved an additional 16% that was attributed to a non-optimized airplane/engine combination.Daggett, David L. and Geiselhart, Karl A. (Technical Monitor)Langley Research CenterEXHAUST EMISSION; AIRCRAFT ENGINES; TECHNOLOGY ASSESSMENT; ENGINE DESIGN; DESIGN ANALYSIS; TURBOFAN ENGINES; TRANSPORT AIRCRAFT; SYSTEMS INTEGRATION; INSTALLING; COMMERCIAL AIRCRAFT; AIRFRAMES
Book Synopsis Aircraft Turbine Engine Control Research at NASA Glenn Research Center by : National Aeronaut Administration (Nasa)
Download or read book Aircraft Turbine Engine Control Research at NASA Glenn Research Center written by National Aeronaut Administration (Nasa) and published by . This book was released on 2020-08-05 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper provides an overview of the aircraft turbine engine control research at the NASA Glenn Research Center (GRC). A brief introduction to the engine control problem is first provided with a description of the state-of-the-art control law structure. A historical aspect of engine control development since the 1940s is then provided with a special emphasis on the contributions of GRC. With the increased emphasis on aircraft safety, enhanced performance, and affordability, as well as the need to reduce the environmental impact of aircraft, there are many new challenges being faced by the designers of aircraft propulsion systems. The Controls and Dynamics Branch (CDB) at GRC is leading and participating in various projects to develop advanced propulsion controls and diagnostics technologies that will help meet the challenging goals of NASA Aeronautics Research Mission programs. The rest of the paper provides an overview of the various CDB technology development activities in aircraft engine control and diagnostics, both current and some accomplished in the recent past. The motivation for each of the research efforts, the research approach, technical challenges, and the key progress to date are summarized. Garg, Sanjay Glenn Research Center NASA/TM-2013-217821, E-18277-1 WBS 432938.11.01.03.02.02.15 AIRCRAFT ENGINES; TURBINE ENGINES; ENGINE CONTROL; PROPULSION SYSTEM PERFORMANCE; PROPULSION SYSTEM CONFIGURATIONS; HISTORIES; CONTROL THEORY; TURBOFAN ENGINES; AIRCRAFT MODELS; SENSORS; FAULT DETECTION; ENGINE FAILURE
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721022014 Total Pages :30 pages Book Rating :4.0/5 (22 download)
Book Synopsis The Modular Aero-Propulsion System Simulation (Mapss) Users' Guide by : National Aeronautics and Space Administration (NASA)
Download or read book The Modular Aero-Propulsion System Simulation (Mapss) Users' Guide written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-11 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Modular Aero-Propulsion System Simulation is a flexible turbofan engine simulation environment that provides the user a platform to develop advanced control algorithms. It is capable of testing the performance of control designs on a validated and verified generic engine model. In addition, it is able to generate state-space linear models of the engine model to aid in controller design. The engine model used in MAPSS is a generic high-pressure ratio, dual-spool, lowbypass, military-type, variable cycle turbofan engine with a digital controller. MAPSS is controlled by a graphical user interface (GUI) and this guide explains how to use it to take advantage of the capabilities of MAPSS.Parker, Khary I. and Melcher, Kevin J.Glenn Research CenterTURBOFAN ENGINES; DIGITAL SIMULATION; GRAPHICAL USER INTERFACE; VARIABLE CYCLE ENGINES; CONTROL SYSTEMS DESIGN; MATHEMATICAL MODELS; AERODYNAMICS; PROPULSION SYSTEM PERFORMANCE; USER MANUALS (COMPUTER PROGRAMS); HIGH PRESSURE; CONTROLLERS; ALGORITHMS; COMPUTER PROGRAMS; LINEARIZATION; DIGITAL SYSTEMS
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781720659570 Total Pages :80 pages Book Rating :4.6/5 (595 download)
Book Synopsis Performance (Off-Design) Cycle Analysis for a Turbofan Engine with Interstage Turbine Burner by : National Aeronautics and Space Administration (NASA)
Download or read book Performance (Off-Design) Cycle Analysis for a Turbofan Engine with Interstage Turbine Burner written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-03 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents the performance of a steady-state, dual-spool, separate-exhaust turbofan engine, with an interstage turbine burner (ITB) serving as a secondary combustor. The ITB, which is located in the transition duct between the high- and the low-pressure turbines, is a relatively new concept for increasing specific thrust and lowering pollutant emissions in modern jet-engine propulsion. A detailed off-design performance analysis of ITB engines is written in Microsoft(Registered Trademark) Excel (Redmond, Washington) macrocode with Visual Basic Application to calculate engine performances over the entire operating envelope. Several design-point engine cases are pre-selected using a parametric cycle-analysis code developed previously in Microsoft(Registered Trademark) Excel, for off-design analysis. The off-design code calculates engine performances (i.e. thrust and thrust-specific-fuel-consumption) at various flight conditions and throttle settings.Liew, K. H. and Urip, E. and Yang, S. L. and Mattingly, J. D. and Marek, C. J.Glenn Research CenterDESIGN ANALYSIS; TURBOFAN ENGINES; STEADY STATE; SPOOLS; BURNERS; DUCTED FLOW; RELIABILITY ANALYSIS; FUEL CONSUMPTION; LOW PRESSURE; PROPULSION
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781719491617 Total Pages :94 pages Book Rating :4.4/5 (916 download)
Book Synopsis Engine Concept Study for an Advanced Single-Aisle Transport by : National Aeronautics and Space Administration (NASA)
Download or read book Engine Concept Study for an Advanced Single-Aisle Transport written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-05-22 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: The desire for higher engine efficiency has resulted in the evolution of aircraft gas turbine engines from turbojets, to low bypass ratio, first generation turbofans, to today's high bypass ratio turbofans. Although increased bypass ratio has clear benefits in terms of propulsion system metrics such as specific fuel consumption, these benefits may not translate into aircraft system level benefits due to integration penalties. In this study, the design trade space for advanced turbofan engines applied to a single aisle transport (737/A320 class aircraft) is explored. The benefits of increased bypass ratio and associated enabling technologies such as geared fan drive are found to depend on the primary metrics of interest. For example, bypass ratios at which mission fuel consumption is minimized may not require geared fan technology. However, geared fan drive does enable higher bypass ratio designs which result in lower noise. The results of this study indicate the potential for the advanced aircraft to realize substantial improvements in fuel efficiency, emissions, and noise compared to the current vehicles in this size class. Guynn, Mark D. and Berton, Jeffrey J. and Fisher, Kenneth L. and Haller, William J. and Tong, Michael and Thurman, Douglas R. Glenn Research Center; Langley Research Center AIRCRAFT DESIGN; GAS TURBINE ENGINES; TURBOJET ENGINES; NOISE REDUCTION; ENGINE DESIGN; GAS EVOLUTION; BYPASS RATIO; TURBOFANS; PROPULSION
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721197798 Total Pages :28 pages Book Rating :4.1/5 (977 download)
Book Synopsis Wave-Rotor-Enhanced Gas Turbine Engine Demonstrator by : National Aeronautics and Space Administration (NASA)
Download or read book Wave-Rotor-Enhanced Gas Turbine Engine Demonstrator written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-15 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: The U.S. Army Research Laboratory, NASA Glenn Research Center, and Rolls-Royce Allison are working collaboratively to demonstrate the benefits and viability of a wave-rotor-topped gas turbine engine. The self-cooled wave rotor is predicted to increase the engine overall pressure ratio and peak temperature by 300% and 25 to 30%. respectively, providing substantial improvements in engine efficiency and specific power. Such performance improvements would significantly reduce engine emissions and the fuel logistics trails of armed forces. Progress towards a planned demonstration of a wave-rotor-topped Rolls-Royce Allison model 250 engine has included completion of the preliminary design and layout of the engine, the aerodynamic design of the wave rotor component and prediction of its aerodynamic performance characteristics in on- and off-design operation and during transients, and the aerodynamic design of transition ducts between the wave rotor and the high pressure turbine. The topping cycle increases the burner entry temperature and poses a design challenge to be met in the development of the demonstrator engine. Welch, Gerard E. and Paxson, Daniel E. and Wilson, Jack and Synder, Philip H. Glenn Research Center NASA/TM-1999-209459, NAS 1.15:209459, ARL-TR-2113, E-11958
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781720942818 Total Pages :82 pages Book Rating :4.9/5 (428 download)
Book Synopsis Small Engine Technology (Set) - Task 4, Regional Turboprop/Turbofan Engine Advanced Combustor Study by : National Aeronautics and Space Administration (NASA)
Download or read book Small Engine Technology (Set) - Task 4, Regional Turboprop/Turbofan Engine Advanced Combustor Study written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-11 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: Under the SET Program Task 4 - Regional Turboprop/Turbofan Engine Advanced Combustor Study, a total of ten low-emissions combustion system concepts were evaluated analytically for three different gas turbine engine geometries and three different levels of oxides of nitrogen (NOx) reduction technology, using an existing AlliedSignal three-dimensional (3-D) Computational Fluid Dynamics (CFD) code to predict Landing and Takeoff (LTO) engine cycle emission values. A list of potential Barrier Technologies to the successful implementation of these low-NOx combustor designs was created and assessed. A trade study was performed that ranked each of the ten study configurations on the basis of a number of manufacturing and durability factors, in addition to emissions levels. The results of the trade study identified three basic NOx-emissions reduction concepts that could be incorporated in proposed follow-on combustor technology development programs aimed at demonstrating low-NOx combustor hardware. These concepts are: high-flow swirlers and primary orifices, fuel-preparation cans, and double-dome swirlers.Reynolds, Robert and Srinivasan, Ram and Myers, Geoffrey and Cardenas, Manuel and Penko, Paul F. (Technical Monitor)Glenn Research CenterTURBOFAN ENGINES; TURBOPROP ENGINES; ENGINE DESIGN; NITROGEN OXIDES; COMPUTATIONAL FLUID DYNAMICS; EXHAUST EMISSION; TAKEOFF; AIRCRAFT LANDING; COMPUTER PROGRAMS; POLLUTION CONTROL
