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Author :
Publisher :
ISBN 13 :
Total Pages : 36 pages
Book Rating : 4.:/5 (317 download)
Download or read book Simplified Off-design Performance Model of a Day Turbofan Engine Cycle written by and published by . This book was released on 1981 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Frederick J. Lallman
Publisher :
ISBN 13 :
Total Pages : 18 pages
Book Rating : 4.:/5 (11 download)
Download or read book Simplified Off-design Performance Model of a Dry Turbofan Engine Cycle written by Frederick J. Lallman and published by . This book was released on 1981 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 28 pages
Book Rating : 4.:/5 (317 download)
Download or read book Simplified Design Point Performance Model of a Dry Turbofan Engine Cycle written by and published by . This book was released on 1981 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 1126 pages
Book Rating : 4.:/5 (31 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1987 with total page 1126 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
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ISBN 13 :
Total Pages : 92 pages
Book Rating : 4.:/5 (317 download)
Download or read book Computer Program for the Design and Off-design Performance of Turbojet and Turbofan Engine Cycles written by and published by . This book was released on 1978 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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)
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 : Robert W. Koenig
Publisher :
ISBN 13 :
Total Pages : 172 pages
Book Rating : 4.:/5 (31 download)
Download or read book GENENG written by Robert W. Koenig and published by . This book was released on 1972 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: A computer program titled GENENG is described. The program uses component performance maps to enable the user to do analytical steady-state engine cycle calculations. Through a scaling procedure, each of the component maps can be used to represent a family of maps (different design values of pressure ratios, efficiency, weight flow, etc. ). Either convergent or convergent divergent nozzles may be used. Included is a complete FORTRAN IV listing of the program. Sample results and input explanations are shown for one-spool and two-spool turbojets and two-spool separate and mixed-flow turbofans operating at design and off-design conditions. The computer program is available from the authors.
Author : Canada. Energy, Mines and Resources Canada
Publisher : Energy, Mines and Resources Canada
ISBN 13 :
Total Pages : 190 pages
Book Rating : 4.:/5 (31 download)
Download or read book Compressors and Turbines written by Canada. Energy, Mines and Resources Canada and published by Energy, Mines and Resources Canada. This book was released on 1987 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: Manual on energy management for compressors and turbines, introducing these pieces of equipment as used in the industrial, commercial and institutional sectors; defining methods of determining the approximate energy consumption; providing potential energy and cost savings available; and providing a series of worksheets to establish a standard method of calculating energy and cost savings. Also included is a glossary and specific details for energy calculations for electric motor drives and alternatives.
Author : Robert W. Buettner
Publisher :
ISBN 13 :
Total Pages : 73 pages
Book Rating : 4.:/5 (13 download)
Download or read book Dynamic Modeling and Simulation of a Variable Cycle Turbofan Engine with Controls written by Robert W. Buettner and published by . This book was released on 2017 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: Next generation aircraft (especially combat aircraft) will include more technology and capability than ever before. This increase in technology comes at the price of higher electrical power requirements and increased waste heat that must be removed from components to avoid overheating induced shutdowns. To help combat the resulting power and thermal management problem, a vehicle level power and thermal management design and optimization toolset was developed in MATLAB®/Simulink®.A dynamic model of a three-stream variable cycle engine was desired to add to the capabilities of the power and thermal management toolset. As an intermediate step to this goal, the dynamic mixed-flow turbofan engine model previously developed for the toolset was modified with an afterburner, a variable geometry nozzle, and a new controller to automatically control the new components. The new afterburning turbofan engine model was tested for a notional mission profile both with and without power take-off. This testing showed that the afterburning turbofan engine model and controller were successful enough to justify moving on to the development of the three-stream variable cycle engine model.The variable cycle engine model was developed using the components of the afterburning turbofan model. The compressor and turbine components were modified to use maps that incorporate the effects of variable inlet guide vane angles. The new engine model and components were sized by attempting to match data from a Numerical Propulsion System Simulation model with similar architecture. A previously developed heat exchanger model was added to the third stream duct of the new engine model. Finally, a new simplified controller was developed for the variable cycle engine model based on the controller developed for the afterburning turbofan model.The new variable cycle engine model was tested for a notional mission profile for five cases. The first case operated the engine model without power take-off and with the third stream heat exchanger removed. The second case added shaft power take-off. The third and fourth cases did away with the power take-off and added the heat exchanger to the engine model with two different hot-side mass flow rate conditions. The fifth case tested the engine with both power take-off and the third stream heat exchanger. The results were promising, showing that the variable cycle engine model had variable cycle tendencies even with a minimum of controlled variable geometry features. The controller was found to be effective, though in need of upgrades to take advantage of the benefits offered by a variable cycle engine. Additionally, it was found that both power take-off and heat rejection to the third stream impact the entire engine cycle.
Author : Joachim Kurzke
Publisher : Springer
ISBN 13 : 3319759795
Total Pages : 766 pages
Book Rating : 4.3/5 (197 download)
Download or read book Propulsion and Power written by Joachim Kurzke and published by Springer. This book was released on 2018-05-28 with total page 766 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book is written for engineers and students who wish to address the preliminary design of gas turbine engines, as well as the associated performance calculations, in a practical manner. A basic knowledge of thermodynamics and turbomachinery is a prerequisite for understanding the concepts and ideas described. The book is also intended for teachers as a source of information for lecture materials and exercises for their students. It is extensively illustrated with examples and data from real engine cycles, all of which can be reproduced with GasTurb (TM). It discusses the practical application of thermodynamic, aerodynamic and mechanical principles. The authors describe the theoretical background of the simulation elements and the relevant correlations through which they are applied, however they refrain from detailed scientific derivations.
Author : D. V. MacInnis
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book A Simplified Cycle-matching Transient Simulation of a Turbofan Engine written by D. V. MacInnis and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Vincent A. Padovano
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (137 download)
Download or read book Characteristics of a Regenerative Cycle Turbofan Aircraft Engine written by Vincent A. Padovano and published by . This book was released on 1963 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Intermarriage of the turbofan engine concept with a regenerative thermodynamic cycle is suggested as a means of improving the thrust specific fuel consumption. The primary objective of this study is to determine generalized performance characteristics of the regenerative cycle turbofan engine by (a) the derivation of the applicable thermodynamic cycle analysis, and (b) the generation of parametric design point performance. Secondary objectives include the optimization of cycle relationships to maximize performance and the quantitative evaluation of the regenerative turbofan from an aircraft mission standpoint. A thermodynamic cycle analysis has been derived for a front-fan, non-mixed exhaust turbofan engine which allows the determination of general engine performance as a function of component performance, flight conditions, and cycle design variables with and without primary stream regeneration. Parametric design point calculations have yielded both the performance characteristics of the simple and regenerative cycle turbofan engines and the comparison between them. The use of regeneration is found to offer significant improvement in turbofan TSFC at the expense of engine weight and size. Analytical means are provided for direct evaluation of the optimum cycle temperature which yields minimum TSFC. Substantial improvement in the range of a subsonic transport aircraft can be realized even up to the point where the regenerative turbofan weighs twice as much as its simple cycle counterpart. Primary stream regeneration can allow a given level of specific fuel consumption improvement to be obtained subsonically at bypass ratios lower than those that would be required by a simple cycle turbofan. Low bypass ratio would be desirable for high subsonic and supersonic operation. Hence, it is concluded that a more flexible performance improvement of the present simple cycle turbofan could well lie in a combination of increased bypass ratio and the selective use of primary stream regeneration.
Author : Laurence H. Fishbach
Publisher :
ISBN 13 :
Total Pages : 196 pages
Book Rating : 4.:/5 (31 download)
Download or read book GENENG II written by Laurence H. Fishbach and published by . This book was released on 1972 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: A computer program titled GENENG II which calculates steady-state design and off-design jet engine performance for two- or three-spool turbofans with one, two, or three nozzles is described. Included in the report are complete FORTRAN IV listings of the program with sample results for nine basic turbofan engines that can be calculated: (1) three-spool, three-stream engine; (2) two-spool, three-stream, boosted-fan engine; (3) two-spool, three-stream, supercharged-compressor engine; (4) three-spool, two-stream engine; (5) two-spool, two stream engine; (6) three-spool, three-stream, aft-fan engine; (7) two-spool, three-stream, aft-fan engine; (8) two-spool, two-stream, aft-fan engine; (9) three-spool, two-stream, aftfan engine. The simulation of other engines by using logical variables built into the program is also described. The computer program is available from the authors.
Author :
Publisher :
ISBN 13 :
Total Pages : 94 pages
Book Rating : 4.:/5 (317 download)
Download or read book ENGINEL: A Single Rotor Turbojet Engine Cycle Match Performance Program written by and published by . This book was released on 1977 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 192 pages
Book Rating : 4.3/5 ( download)
Download or read book Aeronautical Engineering written by and published by . This book was released on 1991 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: A selection of annotated references to unclassified reports and journal articles that were introduced into the NASA scientific and technical information system and announced in Scientific and technical aerospace reports (STAR) and International aerospace abstracts (IAA).
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ISBN 13 :
Total Pages : 38 pages
Book Rating : 4.:/5 (227 download)
Download or read book SIMULATION OF TURBOFAN ENGINE. PART 1. DESCRIPTION OF METHOD AND BALANCING TECHNIQUE. written by and published by . This book was released on 1967 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report describes a digital computer program titled SMOTE (simulation of Turbofan Engine). SMOTE is a computer program for balancing-cycle turbofan engines capable of running both design and off-design points. Component performance maps are reduced to Block Data (tabular form) to provide a base for calculating component performance. The design point is run first and map correction factors are calculated to scale the components to the desired performance. These correction factors are then applied to the component performance maps at off-design points. Initially, when the program is running at an off-design point, the cycle is not balanced, and errors (for example, work required by the compressor minus work supplied by the turbine) are generated. Small changes in engine independent variables (for example, compressor speed) then produce small changes in the errors, and these differential changes are loaded into a matrix. The matrix is then solved for the set of independent variables which results in zero errors, thus balancing the cycle. Actually, this process may be repeated several times before it reaches a balanced point because there is a non linear relationship between the independent variables and the errors. Sample results are included in the report.
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Publisher :
ISBN 13 :
Total Pages : 332 pages
Book Rating : 4.:/5 (319 download)
Download or read book NASA SP. written by and published by . This book was released on 1992 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:
