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Numerical Investigation Of Dual Mode Scramjet Combustor With Large Upstream Interaction
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Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781721145089 Total Pages :114 pages Book Rating :4.1/5 (45 download)
Book Synopsis Numerical Investigation of Dual-Mode Scramjet Combustor with Large Upstream Interaction by : National Aeronautics and Space Administration (NASA)
Download or read book Numerical Investigation of Dual-Mode Scramjet Combustor with Large Upstream Interaction written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-20 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dual-mode scramjet combustor configuration with significant upstream interaction is investigated numerically, The possibility of scaling the domain to accelerate the convergence and reduce the computational time is explored. The supersonic combustor configuration was selected to provide an understanding of key features of upstream interaction and to identify physical and numerical issues relating to modeling of dual-mode configurations. The numerical analysis was performed with vitiated air at freestream Math number of 2.5 using hydrogen as the sonic injectant. Results are presented for two-dimensional models and a three-dimensional jet-to-jet symmetric geometry. Comparisons are made with experimental results. Two-dimensional and three-dimensional results show substantial oblique shock train reaching upstream of the fuel injectors. Flow characteristics slow numerical convergence, while the upstream interaction slowly increases with further iterations. As the flow field develops, the symmetric assumption breaks down. A large separation zone develops and extends further upstream of the step. This asymmetric flow structure is not seen in the experimental data. Results obtained using a sub-scale domain (both two-dimensional and three-dimensional) qualitatively recover the flow physics obtained from full-scale simulations. All results show that numerical modeling using a scaled geometry provides good agreement with full-scale numerical results and experimental results for this configuration. This study supports the argument that numerical scaling is useful in simulating dual-mode scramjet combustor flowfields and could provide an excellent convergence acceleration technique for dual-mode simulations. Mohieldin, T. O. and Tiwari, S. N. and Reubush, David E. (Technical Monitor) Langley Research Center NAG1-2266
Book Synopsis Investigation of Dual-mode Combustion with Large Upstream Interaction by : Melanie Olynciw-Mills
Download or read book Investigation of Dual-mode Combustion with Large Upstream Interaction written by Melanie Olynciw-Mills and published by . This book was released on 2001 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Numerical Investigation of Flowfield Modification in High-speed Airbreathing Inlets Using Energy Deposition by : Matthew Flynn Rohweder
Download or read book A Numerical Investigation of Flowfield Modification in High-speed Airbreathing Inlets Using Energy Deposition written by Matthew Flynn Rohweder and published by . This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Energy deposition in front of dual-mode ram/scramjet engines is numerically investigated utilizing two-dimensional CFD for its potential to modify inlet/isolator flow-fields for engine start/unstart control and for its general potential for generating large-scale flow-field modification in such flows. A simplified (high Mach number) constant-area duct geometry is initially defined in order to test the feasibility of the concept; the results from this initial investigation demonstrates possible beneficial effects of depositing energy upstream of a thermally choked duct in terms of causing massive changes in flow patterns, including the reestablishment of supersonic flow throughout the duct. This study is followed by the definition of a realistic high-speed engine domain focusing on the lower external and internal engine side of a hypersonic vehicle. A quasi-one-dimensional solver is constructed and used to establish approximate understanding of thermal choking limits in the defined geometry. A CFD investigation of this actual engine geometry is performed in which heating blocks are used to simulate fuel-air combustion in the engine combustor. Actual choking limits are established and a base-line case defined with substantial (choked flow) upstream interaction. A range of energy deposition cases are then run in order to assess the use of upstream energy deposition for facilititating restarting an unstarted engine, mitigating unstart, and generating large-scale flow-field modification in the isolator/inlet of a dual-mode ram/scramjet engine. Results indicate that, although the ability to actually increase performance of an unstarted engine through the use of upstream energy deposition is minimal, there is indication that the use of such a technique for generating a "virtual cowl" and/or a "virtual" isolator (including throats, etc.) is possible"--Abstract, leaf iii
Book Synopsis Scramjet Combustion by : Gautam Choubey
Download or read book Scramjet Combustion written by Gautam Choubey and published by Butterworth-Heinemann. This book was released on 2022-07-08 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scramjet Combustion explores the development of a high-speed scramjet engine operating in the supersonic/hypersonic range for various air and space transport applications. The book explains the basic structure, components, working cycle, and the relevant governing equations in a clear manner that speaks to both advanced and more novice audiences. Particular attention is paid to efficient air–fuel combustion, looking at both the underlying fundamentals of combustion as well strategies for obtaining optimum combustion efficiency. Methods for reaching the chemically correct air–fuel ratio, subsequent flame, and combustion stabilization as air enters at supersonic speed are also outlined. Further, it includes the continuous on-going efforts, innovations, and advances with respect to the design modification of scramjet combustors, as well as different strategies of fuel injections for obtaining augmented performance while highlighting the current and future challenges. Outlines the fundamentals of scramjet engines including their basic structure and components, working cycle, governing equations, and combustion fundamentals affecting the combustion and mixing processes Presents new design modifications of scramjet combustors and different fuel injection strategies including combined fuel injection approaches Discusses core topics such as chemical kinetics in supersonic flow, fuel–air mixing methods, strategies for combating combustion difficulties, and subsequent flame and combustion stabilization that can be applied to scramjets Describes the pedagogy for computational approaches in simulating supersonic flows
Book Synopsis Scramjet Propulsion by : E. T. Curran
Download or read book Scramjet Propulsion written by E. T. Curran and published by AIAA. This book was released on 2001 with total page 1354 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Asymmetric Flow-structures in Dual Mode Scramjet Combustor with Significant Upstream Interaction by : T. O. Mohieldin
Download or read book Asymmetric Flow-structures in Dual Mode Scramjet Combustor with Significant Upstream Interaction written by T. O. Mohieldin and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Numerical Study of a Scramjet Combustor Fueled by and Aerodynamic Ramp Injector in Dual-mode Combustion by : D. R. Eklund
Download or read book Numerical Study of a Scramjet Combustor Fueled by and Aerodynamic Ramp Injector in Dual-mode Combustion written by D. R. Eklund and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dual Mode Scramjet by : Ryan Timothy Milligan
Download or read book Dual Mode Scramjet written by Ryan Timothy Milligan and published by . This book was released on 2009 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Numerical analysis was performed on a Dual-Mode Scramjet isolator-combustor. Preliminary analysis was performed to form a baseline geometry. Another study validated the results of a 2D model compared to a 3D model. Stable combustion was shown at two different flight conditions, M=3.0 and M=2.5. A marginal 5% decrease in stream thrust was shown by introducing a 50/50 mix of methane and ethylene. Based on the results of the preliminary analysis, detailed geometry analysis was performed on the 3D baseline geometry. Adding a new set of cavity feeding injectors increased the overall stream thrust and the equivalence ratio in the cavity. Using less fuel than the baseline configuration, revealed a 6.4% increase in stream thrust and an 11% increase in combustion efficiency by placing the second stage injector further upstream. Future analysis includes combining the cavity feeding with closer injector placement, which is expected to yield even better results.
Book Synopsis Hypersonic Airbreathing Propulsion by : William H. Heiser
Download or read book Hypersonic Airbreathing Propulsion written by William H. Heiser and published by AIAA. This book was released on 1994 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt: An almost entirely self-contained engineering textbook primarily for use in undergraduate and graduate courses in airbreathing propulsion. It provides a broad and basic introduction to the elements needed to work in the field as it develops and grows. Homework problems are provided for almost every individual subject. An extensive array of PC-based user-friendly computer programs is provided in order to facilitate repetitious and/or complex calculations. Annotation copyright by Book News, Inc., Portland, OR
Book Synopsis 28th International Symposium on Shock Waves by : Konstantinos Kontis
Download or read book 28th International Symposium on Shock Waves written by Konstantinos Kontis and published by Springer Science & Business Media. This book was released on 2012-03-22 with total page 1122 pages. Available in PDF, EPUB and Kindle. Book excerpt: The University of Manchester hosted the 28th International Symposium on Shock Waves between 17 and 22 July 2011. The International Symposium on Shock Waves first took place in 1957 in Boston and has since become an internationally acclaimed series of meetings for the wider Shock Wave Community. The ISSW28 focused on the following areas: Blast Waves, Chemically Reacting Flows, Dense Gases and Rarefied Flows, Detonation and Combustion, Diagnostics, Facilities, Flow Visualisation, Hypersonic Flow, Ignition, Impact and Compaction, Multiphase Flow, Nozzle Flow, Numerical Methods, Propulsion, Richtmyer-Meshkov, Shockwave Boundary Layer Interaction, Shock Propagation and Reflection, Shock Vortex Interaction, Shockwave Phenomena and Applications, as well as Medical and Biological Applications. The two Volumes contain the papers presented at the symposium and serve as a reference for the participants of the ISSW 28 and individuals interested in these fields.
Book Synopsis A Numerical Investigation of Scramjet Combustors by : H. H. Klein
Download or read book A Numerical Investigation of Scramjet Combustors written by H. H. Klein and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Design and Analysis of a Mach 3 Dual Mode Scramjet Combustor by : Christopher Ryan Corbin
Download or read book Design and Analysis of a Mach 3 Dual Mode Scramjet Combustor written by Christopher Ryan Corbin and published by . This book was released on 2008 with total page 91 pages. Available in PDF, EPUB and Kindle. Book excerpt: Low speed operation of a dual mode scramjet engine is important to the development of a two stage to orbit reusable launch vehicle. This study investigates the Mach 3 operation of a dual mode scramjet engine. SRGULL, a one-dimensional cycle code for scramjet engines, and VULCAN, a computational fluid dynamics code capable of solving reacting flows, are used in this study. Staged injection is investigated to allow more heat release at a low flight Mach number condition so that more thrust can be achieved and inlet unstart is avoided. The nominal case has one injector located 1.067 meters downstream of the inlet with a fuel equivalence ration of 0.488. An increase in thrust of 11.6% is shown in this study by injecting a fuel equivalence ratio of 0.437 upstream and a fuel equivalence ratio of 0.369 at a location 0.8 meters downstream of the first injector.
Book Synopsis An Analysis of Combustion Studies in Shock Expansion Tunnels and Reflected Shock Tunnels by : Casimir J. Jachimowski
Download or read book An Analysis of Combustion Studies in Shock Expansion Tunnels and Reflected Shock Tunnels written by Casimir J. Jachimowski and published by . This book was released on 1992 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book 04-2370 - 04-2473 written by and published by . This book was released on 2004 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis 41st AIAA Aerospace Sciences Meeting & Exhibit by :
Download or read book 41st AIAA Aerospace Sciences Meeting & Exhibit written by and published by . This book was released on 2003 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis 40th AIAA Aerospace Sciences Meeting & Exhibit by :
Download or read book 40th AIAA Aerospace Sciences Meeting & Exhibit written by and published by . This book was released on 2002 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analysis of a Dual-mode Scramjet Combustor by : T. M. Abdel-Salam
Download or read book Analysis of a Dual-mode Scramjet Combustor written by T. M. Abdel-Salam and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
