Accession Number : AD0675923

Title :   EFFECTS OF VARIABLE HEAT CAPACITY OF A GAS IN SUPERSONIC FLOW PAST BLUNT BODIES,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Lunkin,Yu. P. ; Timofeeva,T. Ya.

Report Date : 20 MAR 1968

Pagination or Media Count : 30

Abstract : The effect of variable heat capacity which is due to the heating of gas in the shock layer on supersonic gas flow past blunt bodies is analyzed in detail for carbon dioxide, oxygen, nitrogen, and air. The effects related to variable heat capacity such as the excitation of internal degrees of freedom, dissociation, and ionization substantially affect the location and shape of the shock wave. A system of nonlinear, partial differential equations of mixed form describing a supersonic gas flow past blunted bodies is solved by the Dorodnitsyn-Belotserkovskiy method of integral relations. The processes of excitation of vibrations, dissociation, and single and double ionization are investigated for all four gases and a system of equations of chemical equilibrium with simultaneous occurrence of these processes is derived. The results of numerical calculations made for a sphere and ellipsoids are given in graphical form for all the gases. Their analysis shows that the effect of variable heat capacity leads to decrease in shock detachment distance. The effects of excitation of the internal degrees of freedom, dissociation, and ionization are more developed in a pure gas than in a gas mixture. (Author)

Descriptors :   (*BLUNT BODIES, SUPERSONIC CHARACTERISTICS), SPECIFIC HEAT, SHOCK WAVES, CARBON DIOXIDE, OXYGEN, NITROGEN, AIR, DISSOCIATION, GAS IONIZATION, USSR

Subject Categories : Aerodynamics
      Fluid Mechanics
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE