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Self Recirculating Casing Treatment Concept For Enhanced Compressor Performance
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Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721513901 Total Pages :30 pages Book Rating :4.5/5 (139 download)
Book Synopsis Self-Recirculating Casing Treatment Concept for Enhanced Compressor Performance by : National Aeronautics and Space Administration (NASA)
Download or read book Self-Recirculating Casing Treatment Concept for Enhanced Compressor Performance written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-19 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: A state-of-the-art CFD code (APNASA) was employed in a computationally based investigation of the impact of casing bleed and injection on the stability and performance of a moderate speed fan rotor wherein the stalling mass flow is controlled by tip flow field breakdown. The investigation was guided by observed trends in endwall flow characteristics (e.g., increasing endwall aerodynamic blockage) as stall is approached and based on the hypothesis that application of bleed or injection can mitigate these trends. The "best" bleed and injection configurations were then combined to yield a self-recirculating casing treatment concept. The results of this investigation yielded: 1) identification of the fluid mechanisms which precipitate stall of tip critical blade rows, and 2) an approach to recirculated casing treatment which results in increased compressor stall range with minimal or no loss in efficiency. Subsequent application of this approach to a high speed transonic rotor successfully yielded significant improvements in stall range with no loss in compressor efficiency. Hathaway, Michael D. Glenn Research Center NASA/TM-2002-211569, E-13353, NAS 1.15:211569, ARL-TR-2748, GT-2002-30368
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 Advances in Gas Turbine Technology by : Ernesto Benini
Download or read book Advances in Gas Turbine Technology written by Ernesto Benini and published by BoD – Books on Demand. This book was released on 2011-11-04 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gas turbine engines will still represent a key technology in the next 20-year energy scenarios, either in stand-alone applications or in combination with other power generation equipment. This book intends in fact to provide an updated picture as well as a perspective vision of some of the major improvements that characterize the gas turbine technology in different applications, from marine and aircraft propulsion to industrial and stationary power generation. Therefore, the target audience for it involves design, analyst, materials and maintenance engineers. Also manufacturers, researchers and scientists will benefit from the timely and accurate information provided in this volume. The book is organized into five main sections including 21 chapters overall: (I) Aero and Marine Gas Turbines, (II) Gas Turbine Systems, (III) Heat Transfer, (IV) Combustion and (V) Materials and Fabrication.
Book Synopsis Advances in Axial Compressor Aerodynamics by : R. Dénos
Download or read book Advances in Axial Compressor Aerodynamics written by R. Dénos and published by . This book was released on 2006 with total page 650 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proceedings of the 3rd Annual International Conference on Material, Machines and Methods for Sustainable Development (MMMS2022) by : Banh Tien Long
Download or read book Proceedings of the 3rd Annual International Conference on Material, Machines and Methods for Sustainable Development (MMMS2022) written by Banh Tien Long and published by Springer Nature. This book was released on with total page 583 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proceedings of the ASME Turbo Expo ... by :
Download or read book Proceedings of the ASME Turbo Expo ... written by and published by . This book was released on 2005 with total page 826 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proceedings of the ASME Turbo Expo 2002 Presented at the 2002 ASME Turbo Expo, June 3-6, 2002, Amsterdam, the Netherlands by :
Download or read book Proceedings of the ASME Turbo Expo 2002 Presented at the 2002 ASME Turbo Expo, June 3-6, 2002, Amsterdam, the Netherlands written by and published by . This book was released on 2002 with total page 726 pages. Available in PDF, EPUB and Kindle. Book excerpt: Annotation This is Volume 1 of five volumes that comprise the proceedings of the June 2002 conference, sponsored by the International Gas Turbine Institute (IGTI), a technical institute of the American Society of Mechanical Engineers. The purpose of the conference was to facilitate international exchange and development of educational and technical information related to the design, application, manufacture, operation, maintenance, and environmental impact of all types of gas engines. With an emphasis upon the need for more efficient, cleaner, and more reliable gas turbines, the approximately 130 articles cover various technical aspects of aircraft engines; coal, biomass, and alternative fuels; combustion and fuels; education; electric power; and vehicular and small turbomachines. There is no subject index. Annotation c. Book News, Inc., Portland, OR (booknews.com).
Book Synopsis Effect of Casing Treatment on Performance of a Multistage Compressor by : Leon M. Wenzel
Download or read book Effect of Casing Treatment on Performance of a Multistage Compressor written by Leon M. Wenzel and published by . This book was released on 1975 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analytical Study of Effect of Casing Treatment on Performance of a Multistage Compressor by : Roger William Snyder
Download or read book Analytical Study of Effect of Casing Treatment on Performance of a Multistage Compressor written by Roger William Snyder and published by . This book was released on 1972 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: The simulation was based on individual stage pressure and efficiency maps. These maps were modified to account for casing treatment effects on the individual stage characteristics. The individual stage maps effects on overall compressor performance were observed. The results show that to improve the performance of the compressor in its normal operating range, casing treatment of the rear stages is required.
Book Synopsis Monthly Catalog of United States Government Publications by :
Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 2004 with total page 1004 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proceedings of the ASME Turbo Expo 2002 by :
Download or read book Proceedings of the ASME Turbo Expo 2002 written by and published by . This book was released on 2002 with total page 594 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Novel Design Methodology for Enhanced Compressor Performance Based on a Dynamic Stability Metric by : Juan Carlos Castiella Ruiz de Velasco
Download or read book A Novel Design Methodology for Enhanced Compressor Performance Based on a Dynamic Stability Metric written by Juan Carlos Castiella Ruiz de Velasco and published by . This book was released on 2005 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) compressor design optimization framework allows a versatile definition of the objective function such that any combination of pressure ratio, efficiency and dynamic stability can be prescribed at various operating speeds. The compressor design optimization framework uses an effective blade-to-blade CFD method (fast blade performance prediction method) to predict the blade row performance which is used to evaluate the compressor performance and dynamic stability. The fast blade performance prediction method is estimated to be 100 times faster than a direct numerical simulation and it is shown that the accuracy is within 2% of the direct numerical simulation results. Design Optimization of a Generic Three Stage Compressor. Two different design philosophies commonly used in compressor design practice are adopted. The first design philosophy is aimed at improving efficiency and the second is targeted to improve operability over the entire compressor operating range. The compressor design optimization for enhanced efficiency demonstrates that improvements in efficiency are due to an optimal matching of the compressor stages. The results show an average efficiency improvement of 1% throughout the operating envelope. At maximum climb conditions an efficiency enhancement of 2.7% is achieved. Furthermore, optimizing for efficiency does not deteriorate stability but yields an average improvement in surge margin of 2.6 points. The compressor design optimization based on ...
Book Synopsis 43rd AIAA Aerospace Sciences Meeting & Exhibit by :
Download or read book 43rd AIAA Aerospace Sciences Meeting & Exhibit written by and published by . This book was released on 2005 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Several Porous Casing Treatments on Stall Limit and on Overall Performance of an Axial-flow Compressor Rotor by : Walter Martin Osborn
Download or read book Effect of Several Porous Casing Treatments on Stall Limit and on Overall Performance of an Axial-flow Compressor Rotor written by Walter Martin Osborn and published by . This book was released on 1971 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several geometrically different porous casings were tested with an axial-flow compressor rotor to determine their effects upon the rotor stall-limit line and overall performance. The tests were conducted using both uniform and nonuniform inlet-flow conditions. The rotor performance with the various casing treatments is compared with that obtained with a solid casing. The ability of the various casing treatments to displace the rotor stall-limit line to lower weight flows was observed. Significant stall-margin increases were obtained with several of the porous casings. Peak efficiencies with two of the porous casings were as high as or slightly higher than that obtained with solid casing.
Book Synopsis Effect of casing treatment on performance of an inlet stage for a transonic multistage compressor by : Donald C. Urasek
Download or read book Effect of casing treatment on performance of an inlet stage for a transonic multistage compressor written by Donald C. Urasek and published by . This book was released on 1976 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Casing Treatment on Performance of an Inlet Stage for a Transonic Multistage Compressor by : D. C. Urasek
Download or read book Effect of Casing Treatment on Performance of an Inlet Stage for a Transonic Multistage Compressor written by D. C. Urasek and published by . This book was released on 1976 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Slotted Casing Treatment on Performance of a Multistage Compressor by : John E. Moss
Download or read book Effect of Slotted Casing Treatment on Performance of a Multistage Compressor written by John E. Moss and published by . This book was released on 1976 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
