Results 131 to 140 of about 56,125 (155)
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The Journal of the Acoustical Society of America, 1964
In this paper, the coupling between electromagnetic sources and acoustic waves with thin piezoelectric disks is discussed for longitudinal waves of hypersound. The experimental results in the range of 500–1000 Mc/sec are in agreement with the calculations. Improved coupling can be obtained by using “double layers” of quarter-wave films. These films act
K. Blötekjaer, W. H. Haydl, C. F. Quate
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In this paper, the coupling between electromagnetic sources and acoustic waves with thin piezoelectric disks is discussed for longitudinal waves of hypersound. The experimental results in the range of 500–1000 Mc/sec are in agreement with the calculations. Improved coupling can be obtained by using “double layers” of quarter-wave films. These films act
K. Blötekjaer, W. H. Haydl, C. F. Quate
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AIAA Journal, 1970
Abstract : A study of the motions of solid particles in a dusty gas in the inviscid hypersonic shock layers of slender wedges and cones and the stagnation regions of cylinders and spheres is carried out. Particles of uniform size and with a size distribution are considered.
Franco Fassio, Ronald F. Probstein
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Abstract : A study of the motions of solid particles in a dusty gas in the inviscid hypersonic shock layers of slender wedges and cones and the stagnation regions of cylinders and spheres is carried out. Particles of uniform size and with a size distribution are considered.
Franco Fassio, Ronald F. Probstein
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Philosophical Transactions of the Royal Society of London. Series A: Physical and Engineering Sciences, 1991
The flight test results from the X-15, Asset, Prime, Reentry F and Shuttle Orbiter flight research programmes are reviewed and compared with theory and ground- based experiments. Primary emphasis is placed on our present capability to predict aerodynamic coefficients and stability derivatives, and distributions of surface pressure and ...
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The flight test results from the X-15, Asset, Prime, Reentry F and Shuttle Orbiter flight research programmes are reviewed and compared with theory and ground- based experiments. Primary emphasis is placed on our present capability to predict aerodynamic coefficients and stability derivatives, and distributions of surface pressure and ...
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2020
Hypersonic wind tunnels are intended for studying the aerodynamics of hypersonic aircraft, space launchers, missiles, projectiles and the atmospheric re-entry of space vehicles.
Jean Délery +5 more
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Hypersonic wind tunnels are intended for studying the aerodynamics of hypersonic aircraft, space launchers, missiles, projectiles and the atmospheric re-entry of space vehicles.
Jean Délery +5 more
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An Introduction to Hypersonic Ablation
The Journal of the Royal Aeronautical Society, 1962SummaryThis paper is intended as an introduction to the theory of ablative processes in a hypersonic environment. The various types of ablation are discussed and the general heat transfer equation for an ablating body is given. The effects of radiation are introduced and the physical significance of the gasification ratio is explained.
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Experimental Facilities for Hypersonic Research
Progress in Aerospace Sciences, 1962Publisher Summary This chapter reviews the experimental facilities for hypersonic research. Many tables and charts are presently available for aerodynamic computations, and these may readily be applied if thermodynamic equilibrium can be assumed at all points in the flow field. However, low densities are often associated with hypersonic flow, because
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THE HYPERSONIC AREA RULE [PDF]
, 1963 Abstract : The hypersonic area rule has been formulated in a work and in a hypothesis that all the mass of a gas is concentrated in an infinitely thin layer contiguous to the shock wave. According to that rule, when thin non- axially-symmetrical blunt bodies with the same bluntness drag values and the same laws of transverse area change in the ...
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1994
Abstract : Moment closures were developed for modeling the transition regime in kinetic theory. This was done using a systematic nonperturbative derivation of a hierarchy of closed systems of moment equations. Criteria were developed regarding the stability of shocks in magnetohydrodynamics.
C. D. Levermore, Moysey Brio
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Abstract : Moment closures were developed for modeling the transition regime in kinetic theory. This was done using a systematic nonperturbative derivation of a hierarchy of closed systems of moment equations. Criteria were developed regarding the stability of shocks in magnetohydrodynamics.
C. D. Levermore, Moysey Brio
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An overview of hypersonic aerothermodynamics
Communications in Applied Numerical Methods, 1988This paper briefly reviews some national studies and new programs concerning hypersonic flight. The flight environment that will be encountered by this new class of hypersonic vehicles is described, and the fluid-dynamic and chemical phenomena that occur in hypersonic flight are examined.
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