Author : Doyle D. Knight
Publisher : Cambridge University Press
Page : 463 pages
File Size : 10,50 MB
Release : 2019-02-21
Category : Science
ISBN : 1107123054
Describes energy deposition using direct current (DC), microwave and laser discharge for flow control at high speeds.
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Publisher :
Page : 0 pages
File Size : 10,32 MB
Release : 2003
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The capability for localized flow control in high speed flows using laser energy deposition has been investigated in a collaborative computational and experimental program. Three proposed applications have been comprehensively studied. First, two models of laser energy deposition in air have been developed and validated by comparison with experiment. The first model is an engineering approach wherein the laser energy deposition is treated as an energy release in a perfect gas. The second model is a detailed physical approach which incorporates real gas chemistry with an eleven species model of air. Comparison with experimental measurements of static temperature, density and velocity (one-component) show good agreement with both models outside the plasma region. Second, a detailed 3-D simulation of laser energy deposition upstream of intersecting shocks at Mach 3.45 demonstrated the capability to force transition from Mach Reflection (MR) to Regular Reflection (RR) in the Dual Solution Domain. This result is particularly important for control of MR to RR transition in high speed inlets for scramjet-powered air vehicles. A companion experimental study showed a momentary reduction in the Mach stem height by 70%, but a Mach Reflection was recovered apparently due to freestream turbulence. Third, detailed 3-D simulations of laser energy deposition upstream of an isolated sphere and an Edney IV interaction at Mach 3.45 were performed. Results show the fundamental features observed in the accompanying experiments.
Author : Mona Golbabaei-Asl
Publisher :
Page : 57 pages
File Size : 46,11 MB
Release : 2014
Category : Frictional resistance (Hydrodynamics)
ISBN :
Energy deposition is a robust technique for various high speed flow control applications including drag reduction. A numerical study is performed for perfect gas flow approaching a blunt cylinder at Mach 3. The energy deposition is simulated by a high temperature filament injected in front of the cylinder. The effect of important dimensionless parameters is studied to characterize the drag modification. The results indicate a saturation effect on maximum drag reduction at higher magnitudes of energy deposition. The computations reveal that the discharge location of the filament does not significantly impact the drag. A phenomenological examination of the interaction is performed. The effectiveness and efficiency of the filament on drag reduction are investigated. A one-dimensional analytical approach is studied to describe the numerical results.
Author : Andrew Russell
Publisher :
Page : pages
File Size : 11,90 MB
Release : 2020
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ISBN :
Author : Doyle D. Knight
Publisher : Cambridge University Press
Page : 464 pages
File Size : 27,78 MB
Release : 2019-02-21
Category : Technology & Engineering
ISBN : 1108605516
Written by a leading expert in the field, this book presents a novel method for controlling high-speed flows past aerodynamic shapes using energy deposition via direct current (DC), laser or microwave discharge, and describes selected applications in supersonic and hypersonic flows. Emphasizing a deductive approach, the fundamental physical principles provided give an understanding of the simplified mathematical models derived therefrom. These features, along with an extensive set of 55 simulations, make the book an invaluable reference that will be of interest to researchers and graduate students working in aerospace engineering and in plasma physics.
Author : Russell G. Adelgren
Publisher :
Page : 332 pages
File Size : 28,98 MB
Release : 2002
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ISBN :
A series of experiments with energy deposition via laser-induced optical breakdown of air, i.e., a laser spark, have been performed. These experiments have demonstrated the possibility of using a laser spark for supersonic flow control. A focused Nd:YAG laser (pulse time of 10 nanoseconds, pulse frequency of 10 Hz, and capable of energy levels up to 600 milli-Joules per pulse) was used to create the energy deposition laser spark. This laser energy deposition was then tested in quiescent air, upstream of a Mach 3.45 sphere with and without shock impingement, into shock structures within the dual solution domain, and into a compressible shear layer.
Author : G. Candler
Publisher :
Page : pages
File Size : 48,6 MB
Release : 2003
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Page : 15 pages
File Size : 19,33 MB
Release : 2007
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Achievement of the future US Air Force mission requires development of new high speed air vehicles. The aerodynamic performance of high speed air vehicles is sensitive to local flow phenomena which may adversely affect vehicle operation and possibly result in vehicle loss. An example is the Edney W shock-shock interaction which causes intense local surface heat transfer. New concepts in local flow control for high speed flows are needed to alleviate or eliminate adverse local flow phenomena. * Recently, a promising new research field in local flow control for high speed flows has emerged - Electromagnetic Local Flow Control (ELFC). Examples include beamed energy addition (e.g, laser and/or microwave energy deposition) and DC discharge, with or without external magnetic fields. Recent conferences and workshops have emphasized the importance of ELFC and identified many promising opportunities. This report describes the research accomplishments of Rutgers - The State University of New Jersey, the University of Illinois Urbana-Champaign and the University of Minnesota in understanding the fundamental physics and practical applications of Electromagnetic Local Flow Control in high speed flows.
Author : Thomas B. Gatski
Publisher : Academic Press
Page : 343 pages
File Size : 17,10 MB
Release : 2013-03-05
Category : Science
ISBN : 012397318X
Compressibility, Turbulence and High Speed Flow introduces the reader to the field of compressible turbulence and compressible turbulent flows across a broad speed range, through a unique complimentary treatment of both the theoretical foundations and the measurement and analysis tools currently used. The book provides the reader with the necessary background and current trends in the theoretical and experimental aspects of compressible turbulent flows and compressible turbulence. Detailed derivations of the pertinent equations describing the motion of such turbulent flows is provided and an extensive discussion of the various approaches used in predicting both free shear and wall bounded flows is presented. Experimental measurement techniques common to the compressible flow regime are introduced with particular emphasis on the unique challenges presented by high speed flows. Both experimental and numerical simulation work is supplied throughout to provide the reader with an overall perspective of current trends. An introduction to current techniques in compressible turbulent flow analysis An approach that enables engineers to identify and solve complex compressible flow challenges Prediction methodologies, including the Reynolds-averaged Navier Stokes (RANS) method, scale filtered methods and direct numerical simulation (DNS) Current strategies focusing on compressible flow control
Author : Hai-Bin Tang
Publisher : Academic Press
Page : 363 pages
File Size : 50,3 MB
Release : 2015-08-04
Category : Technology & Engineering
ISBN : 0128018003
Introduction to Plasmas and Plasma Dynamics provides an accessible introduction to the understanding of high temperature, ionized gases necessary to conduct research and develop applications related to plasmas. While standard presentations of introductory material emphasize physics and the theoretical basis of the topics, this text acquaints the reader with the context of the basic information and presents the fundamental knowledge required for advanced work or study. The book relates theory to relevant devices and mechanisms, presenting a clear outline of analysis and mathematical detail; it highlights the significance of the concepts with reviews of recent applications and trends in plasma engineering, including topics of plasma formation and magnetic fusion, plasma thrusters and space propulsion. Presents the essential principles of plasma dynamics needed for effective research and development work in plasma applications Emphasizes physical understanding and supporting theoretical foundation with reference to their utilization in devices, mechanisms and phenomena Covers a range of applications, including energy conversion, space propulsion, magnetic fusion, and space physics
