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On The Goertler Instability In Hypersonic Flows Sutherland Law Fluids And Real Gas Effects
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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 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:
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 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 Instability and Transition in Compressible Boundary Layers by :
Download or read book Instability and Transition in Compressible Boundary Layers written by and published by . This book was released on 1991 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results are presented for (a) Real gas effects and Gortler vortices, (b) Nonparallel effects on Gortler vortex growth of Sutherland Law fluids, (c) Secondary instability analysis of finite amplitude Gortler vortices at hypersonic speeds, (d) Effects of crossflow velocities on Gortler vortices, (e) Mode interactions in compressible flows, (f) Receptivity theory for Gortler vortices.
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 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 1992 with total page 324 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effects of Goertler Vortices, Wall Cooling and Gas Dissociation on the Rayleigh Instability in a Hypersonic Boundary Layer by : Institute for Computer Applications in Science and Engineering
Download or read book Effects of Goertler Vortices, Wall Cooling and Gas Dissociation on the Rayleigh Instability in a Hypersonic Boundary Layer written by Institute for Computer Applications in Science and Engineering and published by . This book was released on 1991 with total page 40 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:
Book Synopsis The Inviscid Compressible Goertler Problem by : Institute for Computer Applications in Science and Engineering
Download or read book The Inviscid Compressible Goertler Problem written by Institute for Computer Applications in Science and Engineering and published by . This book was released on 1991 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Annual Index by :
Download or read book Government Reports Annual Index written by and published by . This book was released on 1991 with total page 1662 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis 26th AIAA Fluid Dynamics Conference by :
Download or read book 26th AIAA Fluid Dynamics Conference written by and published by . This book was released on 1995 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Annual Report 1989-90 by : New Brunswick. Department of Transportation
Download or read book Annual Report 1989-90 written by New Brunswick. Department of Transportation and published by . This book was released on 1991 with total page 1272 pages. Available in PDF, EPUB and Kindle. Book excerpt: General activity review of associated branches and agencies to the Department which includes corporate securities registrations, a list of tenders received, and general financial data. Branches and agencies reviewed are responsible for motor vehicle activity, highway construction, traffic engineering, telecommunications and public utilities.
Book Synopsis Transitional and Turbulent Compressible Flows by :
Download or read book Transitional and Turbulent Compressible Flows written by and published by . This book was released on 1995 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1991 with total page 1256 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 Transitional and Turbulent Compressible Flows, 1995 by : L. D. Kral
Download or read book Transitional and Turbulent Compressible Flows, 1995 written by L. D. Kral and published by . This book was released on 1995 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:
