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On The Goertler Instability In Hypersonic Flows
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Book Synopsis On the Goertler Instability in Hypersonic Flows: Sutherland Law Fluids and Real Gas Effects by : Institute for Computer Applications in Science and Engineering
Download or read book On the Goertler Instability in Hypersonic Flows: Sutherland Law Fluids and Real Gas Effects written by Institute for Computer Applications in Science and Engineering and published by . This book was released on 1990 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722678227 Total Pages :72 pages Book Rating :4.6/5 (782 download)
Book Synopsis On the Goertler Instability in Hypersonic Flows by : National Aeronautics and Space Administration (NASA)
Download or read book On the Goertler Instability in Hypersonic Flows written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-10 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Goertler vortex instability mechanism in a hypersonic boundary layer on a curved wall is investigated. The precise roles of the effects of boundary layer growth, wall cooling, and gas dissociation is clarified in the determination of stability properties. It is first assumed that the fluid is an ideal gas with viscosity given by Sutherland's law. It is shown that when the free stream Mach number M is large, the boundary layer divides into two sublayers: a wall layer of O(M sup 3/2) thickness over which the basic state temperature is O(M squared) and a temperature adjustment layer of O(1) thickness over which the basic state temperature decreases monotonically to its free stream value. Goertler vortices which have wavelengths comparable with the boundary layer thickness are referred to as wall modes. It is shown that their downstream evolution is governed by a set of parabolic partial differential equations and that they have the usual features of Goertler vortices in incompressible boundary layers. As the local wavenumber increases, the neutral Goertler number decreases and the center of vortex activity moves towards the temperature adjustment layer. Goertler vortices with wavenumbers of order one or larger must necessarily be trapped in the temperature adjustment layer and it is this mode which is most dangerous. For this mode, it was found that the leading order term in the Goertler number expansion is independent of the wavenumber and is due to the curvature of the basic state. This term is also the asymptotic limit of the neutral Goertler numbers of the wall mode. To determine the higher order corrections terms in the Goertler number expansion, two wall curvature cases are distinguished. Real gas effects were investigated by assuming that the fluid is an ideal dissociating gas. It was found that both gas dissociation and wall cooling are destabilizing for the mode trapped in the temperature adjustment layer, but for the wall mode trapped near the wall the ef...
Book Synopsis Secondary Instabilities of Görtler Vortices in High-Speed Boundary Layers by : Jie Ren
Download or read book Secondary Instabilities of Görtler Vortices in High-Speed Boundary Layers written by Jie Ren and published by Springer. This book was released on 2017-10-27 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis first reveals the mechanism of Görtler instabilities and then demonstrates how transitions at hypersonic flows can be effectively controlled (either promoted or suppressed) with Görtler or Klebanoff modes. It focuses on understanding and controlling flow transitions from mild laminar to fully turbulent flows at high speeds—aspects that have become crucial at the dawn of an incredible era, in which hypersonic vehicles are becoming available. Once this occurs, it will be possible to travel from Beijing to Los Angeles within just 2 hours, and we will all live in a genuinely global village—and not just virtually, but physically. Görtler instabilities have often been used to promote flow transition in hypersonic vehicles. However, how Görtler instabilities are excited and how they evolve in hypersonic flows are questions that have yet to be answered.
Book Synopsis Nonlinear Development and Secondary Instability of Goertler Vortices in Hypersonic Flows by : Institute for Computer Applications in Science and Engineering
Download or read book Nonlinear Development and Secondary Instability of Goertler Vortices in Hypersonic Flows written by Institute for Computer Applications in Science and Engineering and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nonlinear Development and Secondary Instability of Gortler Vortices in Hypersonic Flows by : Yibin B. Fu
Download or read book Nonlinear Development and Secondary Instability of Gortler Vortices in Hypersonic Flows written by Yibin B. Fu and published by . This book was released on 1991 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722454630 Total Pages :28 pages Book Rating :4.4/5 (546 download)
Book Synopsis On the Gortler Vortex Instability Mechanism at Hypersonic Speeds by : National Aeronautics and Space Administration (NASA)
Download or read book On the Gortler Vortex Instability Mechanism at Hypersonic Speeds written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-09 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: The linear instability of the hypersonic boundary layer on a curved wall is considered. As a starting point the viscosity of the fluid is taken to be a linear function of temperature and real-gas effects are ignored. It is shown that the flow is susceptible to Gortler vortices and that they are trapped in the logarithmically thin adjustment layer in which the temperature of the basic flow changes rapidly to its free stream value. The vortices decay exponentially in both directions away from this layer and are most unstable when their wavelength is comparable with the depth of the adjustment layer. The non-uniqueness of the neutral stability curve associated with incompressible Gortler vortices is shown to disappear at high Mach numbers if the appropriate fast streamwise dependence of the instability is built into the disturbance flow structure. It is shown that in the hypersonic limit wall-cooling has a negligible effect on the stability of a fluid with a given value of the Chapman constant. Hall, Philip and Fu, Yibin Langley Research Center NAS1-18605; RTOP 505-90-21-01...
Book Synopsis Crossflow Effects on the Growth Rate of Inviscid Goertler Vortices in a Hypersonic Boundary Layer by : Institute for Computer Applications in Science and Engineering
Download or read book Crossflow Effects on the Growth Rate of Inviscid Goertler Vortices in a Hypersonic Boundary Layer written by Institute for Computer Applications in Science and Engineering and published by . This book was released on 1992 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis On the Gortler Vortex Instability Mechanism at Hypersonic Speeds by : Philip Hall
Download or read book On the Gortler Vortex Instability Mechanism at Hypersonic Speeds written by Philip Hall and published by . This book was released on 1989 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis On the Görtler Instability in Hypersonic Flows by : Y. B. Fu
Download or read book On the Görtler Instability in Hypersonic Flows written by Y. B. Fu and published by . This book was released on 1990 with total page 67 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Secondary Gortler Instability in Hypersonic Boundary Layers by : Chong W. Wang
Download or read book Secondary Gortler Instability in Hypersonic Boundary Layers written by Chong W. Wang and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Direct Numerical Simulation of Gortler Instability in Hypersonic Boundary Layers by : Chong W. Whang
Download or read book Direct Numerical Simulation of Gortler Instability in Hypersonic Boundary Layers written by Chong W. Whang and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis On the Görtler Instability in Hypersonic Flows by :
Download or read book On the Görtler Instability in Hypersonic Flows written by and published by . This book was released on 1993 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Goertler Vortices Development in Hypersonic Flows by : I. I. Lipatov
Download or read book Goertler Vortices Development in Hypersonic Flows written by I. I. Lipatov and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis On the Instability of Hypersonic Flow Past a Flat Plate by : Institute for Computer Applications in Science and Engineering
Download or read book On the Instability of Hypersonic Flow Past a Flat Plate written by Institute for Computer Applications in Science and Engineering and published by . This book was released on 1990 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: The instability of hypersonic boundary-layer flows over flat plates is considered. The viscosity of the fluid is taken to be governed by Sutherland's law, which gives a much more accurate representation of the temperature dependence of fluid viscosity at hypersonic speeds than Chapmans's approximate linear law; although at lower speeds the temperature variation of the mean state is less pronounced so that the Chapman law can be used with some confidence. Attention is focussed on the so-called vorticity mode of instability of the viscous hypersonic boundary layer. The instability of the hypersonic boundary layer is non-interactive. The vorticity mode of instability of this flow operates on a significantly different lengthscale than that obtained if a Chapman viscosity law is assumed. The growth rate predicted by a linear viscosity law overestimates the size of the growth rate by O (M-sq). Next, the development of the vorticity mode as the wavenumber decreases is described, and it is shown that acoustic modes emerge when the wavenumber has decreased from it's O(1) initial value to O (M to the -3/2 power). (jhd).
Book Synopsis On the Instability of Hypersonic Flow Past a Wedge by : Institute for Computer Applications in Science and Engineering
Download or read book On the Instability of Hypersonic Flow Past a Wedge written by Institute for Computer Applications in Science and Engineering and published by . This book was released on 1988 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis DNS Studies of Transitional Hypersonic Reacting Flows Over 3-D Hypersonic Vehicles by :
Download or read book DNS Studies of Transitional Hypersonic Reacting Flows Over 3-D Hypersonic Vehicles written by and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of this research project are to develop CFD techniques and to conduct DNS studies of fundamental flow physics leading to boundary-layer instability and transition in hypersonic flows During the three-year period, we have conducted extensive DNS studies on the receptivity of a supersonic boundary layer over a blunt cone, and over both sharp and blunt leading edge; and on the receptivity of the Goertler vortices. DNS studies were also compared with Stetson's 1984 stability experiment on Mach 7.99 flow over a blunt cone. Our studies have led to new understanding of a number of hypersonic boundary layer receptivity mechanisms. Such understanding can lead to better tool for the prediction and control of high-speed boundary layer transition.
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 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
