Accession Number : ADA299541

Title :   Interaction of Chemistry, Turbulence, and Shock Waves in Hypervelocity Flow.

Descriptive Note : Annual Progress rept.,

Corporate Author : CALIFORNIA INST OF TECH PASADENA GRADUATE AERONAUTICAL LABS

Personal Author(s) : Candler, G. ; Dimotakis, P. ; Hornung, Hans G. ; Leonard, A. ; Meiron, D.

PDF Url : ADA299541

Report Date : 01 SEP 1995

Pagination or Media Count : 82

Abstract : Significant progress was made during the second year of an interdisciplinary experimental, numerical and theoretical program to extend the state of knowledge and understanding of the effects of chemical reactions in hypervelocity flows. The program addressed key problems in naerothermochemistry that arise from interactions between the three strongly nonlinear effects: Compressibility; vorticity; and chemistry. Important new results included: Clear understanding of the two important parameters that define hypervelocity flow over spheres. Closed-form solution for stand-off distance. Completion of computation of hollow-core compressible vortex streets. First high-resolution interferograms of shock-shock interaction in hypervelocity flow. Detailed experimental and theoretical study shows that high-enthalpy real-gas effects do not further increase heat flux in type IV Interaction. Interferograms establish flow quality in the hypervelocity shock tunnel T5. Upgrade of the Supersonic Shear Layer facility to higher Mach number. New results on supersonic shear layers and shear-layer/shock-wave interaction. Computational discovery of a flow field that is sensitive to vibration-dissociation coupling. Extension of the equilibrium flux method to a more robust less dissipative form and tests. Computation of collision cross section to electrons of low excited states of OH, NO, and CO2. Establishment of Laser-Induced Thermal Acoustics as an accurate diagnostic for gas properties over large pressure ranges. (AN)

Descriptors :   *SHOCK WAVES, *TURBULENCE, *VORTICES, *HYPERSONIC FLOW, THERMAL PROPERTIES, HEAT TRANSFER, MATHEMATICAL MODELS, VIBRATION, REACTION KINETICS, TURBULENT BOUNDARY LAYER, COMPUTATIONAL FLUID DYNAMICS, HIGH RESOLUTION, GAS DYNAMICS, ELECTRONS, LASER APPLICATIONS, COMPRESSIBLE FLOW, INTERFEROGRAMS, FLOW FIELDS, NONLINEAR SYSTEMS, SOLUTIONS(GENERAL), THERMOCHEMISTRY, NONEQUILIBRIUM FLOW, MACH NUMBER, SUPERSONIC FLOW, CARBON DIOXIDE, HEAT FLUX, SUPERSONIC CHARACTERISTICS, AEROTHERMODYNAMICS, HYPERSONIC VELOCITY, ENTHALPY, CHEMICAL EQUILIBRIUM, GAS SURFACE INTERACTIONS, NITROUS OXIDE, SHEAR FLOW, PARTICLE COLLISIONS.

Subject Categories : Fluid Mechanics
      Physical Chemistry
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE