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Performance Study Of A Regenerative Flow Compressor As A Secondary Air Pump For Engine Emission Control
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Book Synopsis Performance Study of a Regenerative Flow Compressor as a Secondary Air Pump for Engine Emission Control by : Younes Elkacimi
Download or read book Performance Study of a Regenerative Flow Compressor as a Secondary Air Pump for Engine Emission Control written by Younes Elkacimi and published by . This book was released on 2007 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Theoretical, Experimental and CFD Analysis of Regenerative Flow Compressors and Pumps for Microturbine and Automotive Fuel Applications by : Muhammad Mukarram Raheel
Download or read book A Theoretical, Experimental and CFD Analysis of Regenerative Flow Compressors and Pumps for Microturbine and Automotive Fuel Applications written by Muhammad Mukarram Raheel and published by . This book was released on 2003 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Performance Evaluation of Pumps and Compressors by : Paresh Girdhar
Download or read book Performance Evaluation of Pumps and Compressors written by Paresh Girdhar and published by Lulu.com. This book was released on 2008-12-24 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive guide to performance evaluation of pumps and compressors. Includes many solved examples and exercises to clarify concepts.Demonstrates the application of this technique to benchmark the asset performance, troubleshoot problems, size and select new equipment,conduct performance tests and re-rate equipment.Good learning and reference guide for engineers and professionals involved in operation, maintenance, failure analysis, specification and procurement of pumps and compressors. Engineering students will find this book bridging the theory to practical applications.
Download or read book Energy Research Abstracts written by and published by . This book was released on 1979 with total page 988 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Design and Tests of a Six-stage Axial-flow Compressor Having a Tip Speed of 550 Feet Per Second and a Flat Operating Characteristic at Constant Speed by : Willard R. Westphal
Download or read book Design and Tests of a Six-stage Axial-flow Compressor Having a Tip Speed of 550 Feet Per Second and a Flat Operating Characteristic at Constant Speed written by Willard R. Westphal and published by . This book was released on 1958 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: A six-stage axial-flow compressor with a tip speed of 550 feet per second and a flat operating characteristics at constant speed has been designed and tested. It was designed for a constant power input per pound of flow in expectation that this would result in a wider mass-flow operating range at a given stagnation-presssure ratio. The design specific weight flow was 21.3 pounds per second per square foot of frontal area at atmospheric discharge with a stagnation-pressure ratio of 3.25 and an inlet hub-tip radius ratio of 0.7. Several configurations consisting of various blade setting angles and solidities were tested. Tests showed that the design flow, pressure ratio, and flat operating characteristic were obtained over a range of 10 percent of design flow at a peak efficiency of 82 percent for design conditions. The compressor had a possible immediate application for air removal from a large slotted-throat transonic wind tunnel, but the design theory could apply to any low-speed industrial compressor or second spool of a turbojet engine.
Book Synopsis Investigation and Analysis of the Performance Characteristics and Flow Circulation in a Test Model Regenerative Pump by : Thomas O. Englehardt
Download or read book Investigation and Analysis of the Performance Characteristics and Flow Circulation in a Test Model Regenerative Pump written by Thomas O. Englehardt and published by . This book was released on 1965 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt: The momentum analysis, even with gross assumptions of linear momentum change causing the pressure buildup, yielded results that agree with the experimental results. The characteristic curves for the test model pump are similar to published curves for regenerative pumps. Therefore, this type of momentum analysis does provide an insight into the circulation and velocity pattern that exists in conventional regenerative pumps. The circulation is very important in this theory of momentum exchange, therefore further work should be directed toward controlling the circulation to yield the desired pump characteristics. The test pump impeller design with the toroid should be compared with regenerative pumps with conventional impeller design in actual tests with other factors equalized. (Author).
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1982 with total page 1282 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.
Book Synopsis A Study of Off-design Performance of an Axial Flow Compressor by : William Brenton Noé
Download or read book A Study of Off-design Performance of an Axial Flow Compressor written by William Brenton Noé and published by . This book was released on 1954 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analysis of the Effects of Design Pressure Ratio Per Stage and Off-design Efficiency on the Operating Range of Multistage Axial-flow Compressors by : Melvyn Savage
Download or read book Analysis of the Effects of Design Pressure Ratio Per Stage and Off-design Efficiency on the Operating Range of Multistage Axial-flow Compressors written by Melvyn Savage and published by . This book was released on 1950 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multistage compressors composed of high-pressure-ratio stages have higher over-all off-design efficiencies and a wider operating range than those made up of low-pressure-ratio stages if the blade-row efficiency curves for the two cases are assumed to be somewhat similar.
Book Synopsis Compressor Instability with Integral Methods by : Eddie Y.K. Ng
Download or read book Compressor Instability with Integral Methods written by Eddie Y.K. Ng and published by Springer Science & Business Media. This book was released on 2007-07-07 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book brings together the quick integral approaches and advances in the field for the prediction of stall and surge problems in the compressor. The book is useful for people involved in the flow analysis, design and testing of rotating machinery. For students, it can be used as a specialized topic of senior undergraduate or graduate study. The book can also serve as self-study material.
Book Synopsis Improving Compressed Air System Performance by :
Download or read book Improving Compressed Air System Performance written by and published by U.S. Department of Energy. This book was released on with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Investigation of Variables Affecting Regenerative Pump Performance by : Miguel Angel Santalo-Cortina
Download or read book Experimental Investigation of Variables Affecting Regenerative Pump Performance written by Miguel Angel Santalo-Cortina and published by . This book was released on 1954 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Academies of Sciences, Engineering, and Medicine Publisher :National Academies Press ISBN 13 :0309440998 Total Pages :123 pages Book Rating :4.3/5 (94 download)
Book Synopsis Commercial Aircraft Propulsion and Energy Systems Research by : National Academies of Sciences, Engineering, and Medicine
Download or read book Commercial Aircraft Propulsion and Energy Systems Research written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2016-08-09 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary human activities that release carbon dioxide (CO2) into the atmosphere are the combustion of fossil fuels (coal, natural gas, and oil) to generate electricity, the provision of energy for transportation, and as a consequence of some industrial processes. Although aviation CO2 emissions only make up approximately 2.0 to 2.5 percent of total global annual CO2 emissions, research to reduce CO2 emissions is urgent because (1) such reductions may be legislated even as commercial air travel grows, (2) because it takes new technology a long time to propagate into and through the aviation fleet, and (3) because of the ongoing impact of global CO2 emissions. Commercial Aircraft Propulsion and Energy Systems Research develops a national research agenda for reducing CO2 emissions from commercial aviation. This report focuses on propulsion and energy technologies for reducing carbon emissions from large, commercial aircraftâ€" single-aisle and twin-aisle aircraft that carry 100 or more passengersâ€"because such aircraft account for more than 90 percent of global emissions from commercial aircraft. Moreover, while smaller aircraft also emit CO2, they make only a minor contribution to global emissions, and many technologies that reduce CO2 emissions for large aircraft also apply to smaller aircraft. As commercial aviation continues to grow in terms of revenue-passenger miles and cargo ton miles, CO2 emissions are expected to increase. To reduce the contribution of aviation to climate change, it is essential to improve the effectiveness of ongoing efforts to reduce emissions and initiate research into new approaches.
Book Synopsis Effect of Self Recirculation Casing Treatment on the Performance of a Turbocharger Centrifugal Compressor by : Matthieu Gancedo
Download or read book Effect of Self Recirculation Casing Treatment on the Performance of a Turbocharger Centrifugal Compressor written by Matthieu Gancedo and published by . This book was released on 2015 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: Increase in emission regulations in the transport industry brings the need to have more efficient engines. A path followed by the automobile industry is to downsize the size of the internal combustion engine and increase the air density at the intake to keep the engine power when needed. Typically a centrifugal compressor is used to force the air into the engine, it can be powered from the engine shaft (superchargers) or extracting energy contained into the hot exhaust gases with a turbine (turbochargers). The flow range of the compressor needs to match the one of the engine. However compressors mass flow operating range is limited by choke on the high end and surge on the low end. In order to extend the operation at low mass flow rates, the use of passive devices for turbocharger centrifugal compressors was explored since the late 80's. Hence, casing treatments including flow recirculation from the inducer part of the compressor have been shown to move the surge limit to lower flows. Yet, the working mechanisms are still not well understood and thus, to optimize the design of this by-pass system, it is necessary to determine the nature of the changes induced by the device both on the dynamic stability of the pressure delivery and on the flow at the inlet. The compressor studied here features a self-recirculating casing treatment at the inlet. The recirculation passage could be blocked to carry a direct comparison between the cases with and without the flow feature. To grasp the effect on compressor stability, pressure measurements were taken in the different constituting elements of the compressor. The study of the mean pressure variations across the operating map showed that the tongue region is a limiting element. Dynamic pressure measurements revealed that the instabilities generated near the inducer when the recirculation is blocked increase the overall instability levels at the compressor outlet and propagating pressure waves starting at the tongue occurred, different in nature from rotating stall. The flow velocity was also measured at the inlet of the compressor by means of planar PIV measurements. The case without recirculation showed strong back flow occurrence at low MFR on the shroud of the inlet passage due to tip recirculation. With recirculation, this back flow was significantly reduced improving the overall stability. However, with the current recirculation channels design, there is an efficiency penalty and the recirculated flow introduces non-homogeneities in the mixing region. Finally, to explore experimentally the effect of variations of the casing treatment, several different designs were tested. It was seen that modifications of the supporting rib shape impacted the efficiency. Also, improvements on the surge line were obtained with flow reinjection near the inducer in the direction of the main flow at low speeds and with induced counter swirl for all speeds.
Book Synopsis An Analysis of the Part Load Performance of Two Axial Flow Compressors by : William Davids Harshbarger
Download or read book An Analysis of the Part Load Performance of Two Axial Flow Compressors written by William Davids Harshbarger and published by . This book was released on 1951 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Design Strategy for a 6:1 Supersonic Mixed-flow Compressor Stage and Its Viscous Flow-based Performance Analysis by : Aravinth Sadagopan
Download or read book A Design Strategy for a 6:1 Supersonic Mixed-flow Compressor Stage and Its Viscous Flow-based Performance Analysis written by Aravinth Sadagopan and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A current surge in the small jet engine market requires compact and robust high-performance compressors. This thesis presents the design of a single-stage high-pressure ratio mixed-flow compressor with a prescribed maximum diameter in the (1-10) kg.s-1 mass flow segment. Its compactness and reliability demonstrate its suitability in replacing a multistage axial compressor design in the small aero-engine segment with a high-performance envelope. A comprehensive background of mixed-flow stage design is provided based on historical developments since the 1940s. A high-pressure ratio demand necessitates supersonic rotor exit flow. The high-pressure ratio and small diameter requirements push the compressor toward a "highly-loaded" supersonic shock-in rotor design with a supersonic stator/diffuser. Hence, tandem stator configurations with two blade rows were investigated in the past to reduce blade loading for efficient diffusion. Even so, most of the previous stage designs were inefficient, due to the inability of stators to efficiently diffuse supersonic flow. Thus, this thesis implements a tandem design based on Quishi et al.A unique mean-line design procedure is presented based on the isentropic equations defined for a mixed-flow stage. Mass flow rate, stage total pressure ratio, and maximum diameter were chosen as the main design constraints, and a geometry construction technique based on Bezier curves was used. The advancement of multi-dimensional and viscous computational tools has improved accessibility to and reduced overall effort in the thorough analysis of complex turbomachinery designs. Therefore, the aim of this thesis is to include all three dimensionality effects of the stage, viscous flow, and compressibility including the shock wave systems.The computational model employed was thoroughly assessed for its ability to predict compressor performance, as compared to existing well-established experimental data. The results from a RANS-based computational fluid dynamics model were compared to the experimental results of NASA Rotor 37 and the RWTH Aachen supersonic tandem diffuser. The computational approach shed light upon the mixed-rotor and supersonic-stator 3D shock structures, as well as the viscous/secondary flow. Furthermore, a rotor design evaluation study was conducted for a 3.5 kg/s mass flow based on the current mean-line code and additional computational analysis. A relatively high single-stage pressure ratio of 6.0 was targeted.The performance map for the mixed-flow stage was obtained to better understanding the viscous flow details and shock systems of this high-pressure ratio mixed-flow compressor. Areas of potential design optimization were highlighted to further improve the stages performance. The in-house mean-line design code predicted a pressure ratio and efficiency of TT = 6.0 and 75.5%, respectively for a mass flow rate of 3.5 kg/s. The mean-line design code obviously lacked the ability to fully capture three-dimensionality, viscous flow, and compressible flow effects due to its inherent over-simplifying assumptions. The inclusion of the RANS-based computations improved the fidelity of the mixed-flow compressor design performance calculations significantly. Comprehensive computational analysis in the current stage showed that the design goal was met with a stage total pressure ratio of TT = 5.83 and an efficiency of _IS = 77% for a mass flow rate of m = 3.03 kg/s. A total pressure ratio of 6.12 was achieved at a slightly higher rotational speed of /o = 1.035 for an efficiency of 75.5 %.
Book Synopsis A Study of the Design and Performance of Jet Compressors by : William Floyd Chase
Download or read book A Study of the Design and Performance of Jet Compressors written by William Floyd Chase and published by . This book was released on 1949 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
