Accession Number : AD0430426


Title :   NONEQUILIBRIUM INVISCID FLOW ABOUT BLUNT BODIES,


Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF


Personal Author(s) : Lee,R H ; Chu,S T


Report Date : 20 Jan 1964


Pagination or Media Count : 61


Abstract : An inverse method was used for analyzing the chemically nonequilibrium flow about a blunt body. This method starts with an assumed form of shock shape. The flow field and the thermodynamics behind the shock is determined by a finite difference mesh scheme. The calculation is continued until the sonic point on the body is exceeded. Mass flow rate is integrated along the curvilinear coordinate normal to the shock to determine locations and shapes of the body and the streamlines. The analysis assumes air to be a five-component reacting gas undergoing six coupled reactions with negligible ionization. Complete rate equations including three-body recombinations are used. Numerical examples are given for frozen and nonequilibrium air flows. Three different kinetic models are used for the reacting cases. The results show that even though the pressure and velocities in the shock layer are not sensitive to the air kinetics, the other thermodynamic properties are significantly influenced by the kinetic models chosen. The nitric oxide concentration is greatly enhanced by its direct formation from molecular oxygen and nitrogen. The extra amount of nitric oxide may cause an appreciable increase in gas cap radiation at high altitudes and superorbital velocities. (Author)


Descriptors :   *HYPERSONIC FLOW , *ATMOSPHERE ENTRY , BLUNT BODIES , CHEMICAL REACTIONS , SHOCK WAVES , AXISYMMETRIC FLOW , AIR , NITROGEN , OXYGEN , OXIDES , NUMERICAL METHODS AND PROCEDURES , RECOMBINATION REACTIONS , FROZEN EQUILIBRIUM FLOW , REENTRY VEHICLES


Distribution Statement : APPROVED FOR PUBLIC RELEASE