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Title: SUPERSONIC JET AND SHOCK INTERACTIONS

Abstract

No abstract prepared.

Authors:
; ;
Publication Date:
Research Org.:
Los Alamos National Lab., NM (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
788298
Report Number(s):
LA-UR-01-5906
TRN: US0302095
DOE Contract Number:
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: Conference title not supplied, Conference location not supplied, Conference dates not supplied; Other Information: PBD: 1 Oct 2001
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; SUPERSONIC TRANSPORT; JETS; INTERACTIONS; LANL

Citation Formats

J. M. FOSTER, B. H. WILDE, and ET AL. SUPERSONIC JET AND SHOCK INTERACTIONS. United States: N. p., 2001. Web.
J. M. FOSTER, B. H. WILDE, & ET AL. SUPERSONIC JET AND SHOCK INTERACTIONS. United States.
J. M. FOSTER, B. H. WILDE, and ET AL. Mon . "SUPERSONIC JET AND SHOCK INTERACTIONS". United States. doi:. https://www.osti.gov/servlets/purl/788298.
@article{osti_788298,
title = {SUPERSONIC JET AND SHOCK INTERACTIONS},
author = {J. M. FOSTER and B. H. WILDE and ET AL},
abstractNote = {No abstract prepared.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Oct 01 00:00:00 EDT 2001},
month = {Mon Oct 01 00:00:00 EDT 2001}
}

Conference:
Other availability
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  • This paper presents a comparison of the measured and the computed spatial stability properties of an aspect ratio 2 supersonic shock free elliptic jet. The shock free nature of the elliptic jet provides an ideal test of validity of modeling the large scale coherent structures in the initial mixing region of noncircular supersonic jets with linear hydrodynamic stability theory. Both aerodynamic and acoustic data were measured. The data are used to compute the mean velocity profiles and to provide a description of the spatial composition of pressure waves in the elliptic jet. A hybrid numerical scheme is applied to solvemore » the Rayleigh problem governing the inviscid linear spatial stability of the jet. The measured mean velocity profiles are used to provide a qualitative model for the cross sectional geometry and the smooth velocity profiles used in the stability analysis. Computational results are presented for several modes of instability at two jet cross sections. The acoustic measurements show that a varicose instability is the jet's perferred mode of motion. The stability analysis predicts that the Strouhal number varies linearly as a function of axial distance in the jet's initial mixing region, which is in good qualitative agreement with previous measurements. 18 refs., 18 figs., 1 tab.« less
  • In a supersonic gas jet issuing from a Laval nozzle solid or liquid particles of sizes varying within the range from fractions of a micron to tens of microns may be present. The distribution of these particles in space and their characteristics depend strongly on the structure of the jet. With an increase in particle size and concentration they themselves begin to influence the parameters of the gas close to the nozzle outlet and the geometry of the first barrel. In this paper a two-phase supersonic jet issuing into a cotraveling flow of gas is considered. The spatial distributions andmore » temperature fields of the solid and liquid phases are investigated taking account of the shock wave structure of the underexpanded jet.« less
  • A supersonic plasma stream was created by an electrical discharge generator with a storage capacity of 140 microfarads and a starting voltage of 1 kV. The plasma was expanded through a cylindrical nozzle into air under normal conditions. Holographic interferometry was used to study the shock wave generated by the stream. The interferometer, operating in a real time regime and coupled to a high-speed photorecorder, attained a space and time resolution of 0.1 cm and 1 microsecond, respectively. The interferograms showed that in the initial instant of time (less than or equal to 10 microseconds) the shock wave surface wasmore » close to the surface of an ellipsoid of rotation with a semiaxis ratio close to unity which, as the distance from the wave increases, changed over into a spherical surface with a center at the outlet of the nozzle. Figures are used to illustrate the dependence of Mach number of the shock wave on time and other results.« less
  • An analytical/numerical model for the deflection and mixing of a single gaseous jet in a supersonic crossflow is presented. The jet cross-section is described in terms of the compressible vortex pair resulting from viscous and impulsive forces acting at the jet periphery, and the vortex pair data are combined with data for the mass and momentum balance along the jet axis in order to model the trajectory and mixing of the injected fluid. A numerical technique is employed to solve for the inviscid outer flow and the position of the bow shock which envelopes the jet. The model is shownmore » to be capable of predicting overall jet penetration (for perfectly or slightly underexpanded jets) to within 10 percent of experimental findings, while requiring only a few seconds of computer time. 24 refs.« less