Accession Number : AD0673543

Title :   HYPERSONIC BLUNT BODY FLOW OF HYDROGEN-OXYGEN MIXTURES.

Descriptive Note : Technical rept.,

Corporate Author : PURDUE UNIV LAFAYETTE IND PROJECT SQUID HEADQUARTERS

Personal Author(s) : Galloway,Arnold J. ; Sichel,Martin

Report Date : JUL 1968

Pagination or Media Count : 145

Abstract : The stagnation region of the shock layer in high velocity flow of hydrogen-oxygen mixtures over blunt bodies is investigated. The method of series truncations is used to obtain numerical solutions of the conservation equations, using complete hydro-oxygen kinetics. A local linearization scheme is applied to the integration of the chemical rate equations in order to reduce computation time. First order solutions are obtained with acceptable accuracy in a relatively short computation time. A second order solution is computed in one case to test the convergence and results in negligible modification of the first order solution. In qualitative agreement with experimental observations, it is found that there is a steep combustion front between the shock and the body, and that combustion results in an increase in shock standoff distance as compared to non-reactive flow. The results are consistent with a previously developed scaling law for hydrogen-oxygen flows. Near-frozen flows exhibit a thin region of rapid chemical reaction adjacent to the body. A parameter identifying this regime is developed, and the shock layer flow of an idealized reacting gas is investigated. An equation describing this flow is presented, and preliminary results indicate that the gas model exhibits the important characteristics of near-frozen shock layer flows. (Author)

Descriptors :   (*REENTRY VEHICLES, SUPERSONIC COMBUSTION), (*SHOCK WAVES, ATMOSPHERE ENTRY), HYPERSONIC CHARACTERISTICS, HYDROGEN, OXYGEN, MIXTURES, BLUNT BODIES, STAGNATION POINT, FROZEN EQUILIBRIUM FLOW, NUMERICAL ANALYSIS, RAMJET ENGINES, REACTION KINETICS

Subject Categories : Aerodynamics
      Fluid Mechanics
      Combustion and Ignition

Distribution Statement : APPROVED FOR PUBLIC RELEASE