Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Separation Control On Low Pressure Turbine Airfoils Using Synthetic Vortex Generator Jets
Download Separation Control On Low Pressure Turbine Airfoils Using Synthetic Vortex Generator Jets full books in PDF, epub, and Kindle. Read online Separation Control On Low Pressure Turbine Airfoils Using Synthetic Vortex Generator Jets ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Separation Control on Low-pressure Turbine Airfoils Using Synthetic Vortex Generator Jets by : Ralph J. Volino
Download or read book Separation Control on Low-pressure Turbine Airfoils Using Synthetic Vortex Generator Jets written by Ralph J. Volino and published by . This book was released on 2003 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Investigation of Separation Control in Low Pressure Turbine Using Pulsed Vortex Generator Jets (Postprint). by :
Download or read book Investigation of Separation Control in Low Pressure Turbine Using Pulsed Vortex Generator Jets (Postprint). written by and published by . This book was released on 2006 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: The periodic fluctuation of velocity in the boundary layer due to forcing of Vortex Generator Jets (VGJs) injected over the suction surface of the Pack-B turbine blade is reported. Blade Reynolds numbers in the turbine cascade match those that occur in aircraft engines while at high altitude cruise. The blowing ratio, a ratio of the jet velocity to the freestream velocity, was set to 2. The VGJs are pitched at 30 degrees and have a skew angle of 90 degrees to the freestream and are located in two rows at 45% and 63% axial chord. PIV data phase locked to the VGJ forcing was used to obtain planar velocity data around the blade. The phase locked PIV images reveal the fluctuation of the flow velocity in the boundary layer with respect to the pulsing period of the VGJ. This sheds light on the mechanism by which the VGJs suppress laminar separation over the blade suction surface.
Book Synopsis Control of Low-pressure Turbine Separation Using Vortex Generator Jets by : Jeffrey P. Bons
Download or read book Control of Low-pressure Turbine Separation Using Vortex Generator Jets written by Jeffrey P. Bons and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721512393 Total Pages :26 pages Book Rating :4.5/5 (123 download)
Book Synopsis Low-Pressure Turbine Separation Control by : National Aeronautics and Space Administration (NASA)
Download or read book Low-Pressure Turbine Separation Control 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 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: The present work details a computational study, using the Glenn HT code, that analyzes the use of vortex generator jets (VGJs) to control separation on a low-pressure turbine (LPT) blade at low Reynolds numbers. The computational results are also compared with the experimental data for steady VGJs. It is found that the code determines the proper location of the separation point on the suction surface of the baseline blade (without any VGJ) for Reynolds numbers of 50,000 or less. Also, the code finds that the separated region on the suction surface of the blade vanishes with the use of VGJs. However, the separated region and the wake characteristics are not well predicted. The wake width is generally over-predicted while the wake depth is under-predicted. Garg, Vijay K. Glenn Research Center NASA/CR-2002-211689, NAS 1.26:211689, E-13419, GT-2002-30229
Book Synopsis Air Breathing Engines and Aerospace Propulsion by : B. N. Raghunandan
Download or read book Air Breathing Engines and Aerospace Propulsion written by B. N. Raghunandan and published by Allied Publishers. This book was released on 2004 with total page 752 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contributed papers presented at the 7th National Conference on Air Breathing Engines and Aerospace Propulsion, hosted at I.I.T., Kanpur.
Book Synopsis Separation Flow Control with Vortex Generator Jets Employed in an Aft-loaded Low-pressure Turbine Cascade with Simulated Upstream Wakes by : Kyle Adler Gompertz
Download or read book Separation Flow Control with Vortex Generator Jets Employed in an Aft-loaded Low-pressure Turbine Cascade with Simulated Upstream Wakes written by Kyle Adler Gompertz and published by . This book was released on 2009 with total page 77 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: Detailed pressure and velocity measurements were acquired at Rec = 20,000 with 3% inlet free stream turbulence intensity to study the effects of position, phase and forcing frequency of vortex generator jets employed on an aft-loaded low-pressure turbine blade in the presence of impinging wakes. The L1A blade has a design Zweifel coefficient of 1.34 and a suction peak at 58% axial chord, making it an aft-loaded pressure distribution. At this Reynolds number, the blade exhibits a non-reattaching separation region beginning at 60% axial chord under steady flow conditions without upstream wakes. Wakes shed by an upstream vane row are simulated with a moving row of cylindrical bars at a flow coefficient of 0.91. Impinging wakes thin the separation zone and delay separation by triggering transition in the separated shear layer, although the flow does not reattach. Instead, at sufficiently high forcing frequencies, a new time-mean separated shear layer position is established which begins at approximately 72%Cx. Reductions in area-averaged wake total pressure loss of more than 75% were documented. One objective of this study was to compare pulsed flow control using two rows of discrete vortex generator jets (VGJs). The VGJs are located at 59%Cx, approximately the peak Cp location, and at 72%Cx. Effective separation control was achieved at both locations. In both cases, wake total pressure loss decreased 35% from the wake only level and the shape of the Cp distribution indicates that the cascade recovers its high Reynolds number (attached flow) performance. The most effective separation control was achieved when actuating at 59%Cx where the VGJ disturbance dominates the dynamics of the separated shear layer, with the wake disturbance assuming a secondary role only. On the other hand, when actuating at 72%Cx, the efficacy of VGJ actuation is derived from the relative mean shear layer position and jet penetration. When the pulsed jet actuation (25% duty cycle) was initiated at the 72%Cx location, synchronization with the wake passing frequency (8.7Hz) was critical to produce the most effective separation control. A 20% improvement in effectiveness over the wake-only level was obtained by aligning the jet actuation between wake events. A range of blowing ratios was investigated at both locations to maximize separation reduction with minimal mass flow. The optimal control parameter set for VGJ actuation at 72%Cx does not represent a reduction in required mass flow compared to the optimal parameter set for actuation at 59%Cx. Differences in the fundamental physics of the jet interaction with the separated shear layer are discussed and implications for the application of flow control in a full engine demonstrator are reviewed. Evidence suggests that flow control using VGJs will be effective in the highly unsteady LPT environment of an operating gas turbine, provided the VGJ location and amplitude are adapted for the specific blade profile.
Book Synopsis Integrated Flow Control Devices for the Design of Enhanced Low Pressure Turbines by :
Download or read book Integrated Flow Control Devices for the Design of Enhanced Low Pressure Turbines written by and published by . This book was released on 2007 with total page 17 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flow separation limits the efficiency of low-pressure turbines (LPTs) in aircraft engines. Experiments with vortex generator jets (VGJs), conducted in AFRL's low-speed cascade at Wright-Patterson AFB, have demonstrated dramatic reductions in separation losses. The critical science that will enable this design innovation to reach its potential is a comprehensive understanding of the effect of VGJs on a separating boundary layer. Experiments were conducted at BYU to better understand the basic physics of the separation control phenomenon and establish the quantitative links between the underlying flow physics and LPT performance. Understanding gained from these experiments was used to guide the design of a new, high-performance LPT blade at AFRL. The Air Force design codes used to generate the new airfoil included provisions for flow control using vortex generator jets. Experiments with the new profile confirmed the design goal of a 17% increase in blade loading compared to industry standard.
Book Synopsis Design and Modeling of Turbine Airfoils with Active Flow Control in Realistic Engine Conditions by :
Download or read book Design and Modeling of Turbine Airfoils with Active Flow Control in Realistic Engine Conditions written by and published by . This book was released on 2008 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flow separation limits the efficiency of low-pressure turbines (LPTs) in aircraft engines. Experiments with vortex generator jets (VGJs), conducted in AFRL's low-speed cascade at Wright-Patterson AFB, have demonstrated dramatic reductions in separation losses. Before flow control can become an integral part of LPT design, research must be conducted in more realistic engine conditions. This can best be accomplished through a combined experimental and computational program that uses both tools in a complementary fashion. Such a program was initiated at BYU in 2007 to better understand the basic physics of the separation control phenomenon and establish the quantitative links between the underlying flow physics and LPT performance under a variety of conditions. A new, high performance LPT blade design (L1A) was received from AFRL. CFD was used to design a new 3-passage cascade facility with the L1A blade. The new cascade was completed at Ohio State University under a subcontract agreement between BYU and OSU since the PI moved to OSU in July 2007. CFD was also used to determine the appropriate diameter and location for an upstream wake generator. The wake generator was used to assess the impact of upstream wakes on the implementation of pulsed VGJ flow control for the Pack B baseline LPT design. The convecting wakes have a first order influence on the LPT flow field.
Book Synopsis Flow Control Techniques and Applications by : Jinjun Wang
Download or read book Flow Control Techniques and Applications written by Jinjun Wang and published by Cambridge University Press. This book was released on 2019 with total page 293 pages. Available in PDF, EPUB and Kindle. Book excerpt: Master the theory, applications and control mechanisms of flow control techniques.
Book Synopsis Axial Turbine Aerodynamics for Aero-engines by : Zhengping Zou
Download or read book Axial Turbine Aerodynamics for Aero-engines written by Zhengping Zou and published by Springer. This book was released on 2018-01-11 with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a monograph on aerodynamics of aero-engine gas turbines focusing on the new progresses on flow mechanism and design methods in the recent 20 years. Starting with basic principles in aerodynamics and thermodynamics, this book systematically expounds the recent research on mechanisms of flows in axial gas turbines, including high pressure and low pressure turbines, inter-turbine ducts and turbine rear frame ducts, and introduces the classical and innovative numerical evaluation methods in different dimensions. This book also summarizes the latest research achievements in the field of gas turbine aerodynamic design and flow control, and the multidisciplinary conjugate problems involved with gas turbines. This book should be helpful for scientific and technical staffs, college teachers, graduate students, and senior college students, who are involved in research and design of gas turbines.
Download or read book Research & Technology 2004 written by and published by DIANE Publishing. This book was released on with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Aerodynamic Unsteadiness in Axial Turbomachines by : R. Dénos
Download or read book Effects of Aerodynamic Unsteadiness in Axial Turbomachines written by R. Dénos and published by . This book was released on 2005 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proceedings of the ... ASME Joint U.S.-European Fluids Engineering Conference by :
Download or read book Proceedings of the ... ASME Joint U.S.-European Fluids Engineering Conference written by and published by . This book was released on 2006 with total page 1098 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book MARE-WINT written by Wiesław Ostachowicz and published by Springer. This book was released on 2016-08-30 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a holistic, interdisciplinary overview of offshore wind energy, and is a must-read for advanced researchers. Topics, from the design and analysis of future turbines, to the decommissioning of wind farms, are covered. The scope of the work ranges from analytical, numerical and experimental advancements in structural and fluid mechanics, to novel developments in risk, safety & reliability engineering for offshore wind.The core objective of the current work is to make offshore wind energy more competitive, by improving the reliability, and operations and maintenance (O&M) strategies of wind turbines. The research was carried out under the auspices of the EU-funded project, MARE-WINT. The project provided a unique opportunity for a group of researchers to work closely together, undergo multidisciplinary doctoral training, and conduct research in the area of offshore wind energy generation. Contributions from expert, external authors are also included, and the complete work seeks to bridge the gap between research and a rapidly-evolving industry.
Book Synopsis Active Flow Separation Control of a Stator Vane Using Surface Injection in a Multistage Compressor Experiment by :
Download or read book Active Flow Separation Control of a Stator Vane Using Surface Injection in a Multistage Compressor Experiment written by and published by . This book was released on 2003 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis AIAA Aerospace Sciences Meeting and Exhibit, 42nd by :
Download or read book AIAA Aerospace Sciences Meeting and Exhibit, 42nd written by and published by . This book was released on 2004 with total page 552 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 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:
