Accession Number : AD0673394

Title :   CALCULATION OF RECOMBINATION RATE CONSTANTS OF DIATOMIC GASES BY THE MACH NUMBER OF THE STREAM AT THE OUTPUT OF A SUPERSONIC NOZZLE (RASCHET KONSTANTY SKOROSTI REKOMBINATSII DVUKHATOMNYKH GAZOV PO CHISLU MAKHA POTOKA NA VYKHODE SVERKHZVUKOVOGO SOPLA),

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Nikolaev,G. N.

Report Date : 08 SEP 1967

Pagination or Media Count : 10

Abstract : The effects of intramolecular processes, such as dissociation, recombination, and excitation of vibration on supersonic gas flows, is of great interest in studying high temperature gas dynamics. In particular, the recombination rate of a dissociated gas had been previously found to affect the expansion in a supersonic nozzle. Therefore, in the present experimental analysis, an attempt was made to calculate the recombination rate from measurements of one of the parameters, in this case, the Mach number, of a gas (oxygen or hydrogen) discharging from a supersonic nozzle. Using an approximate method based on the concept that the chemical composition is frozen instantaneously, the relationships between the Mach number and the nozzle cross section, which varied according to a hyperbolic law, were calculated and plotted at 8500K and 4200K. It was proved that the recombination rate constant can be calculated from the experimentally determined Mach number at the nozzle outlet. (Author)

Descriptors :   (*NOZZLE GAS FLOW, *RECOMBINATION REACTIONS), DISSOCIATION, REACTION KINETICS, DIATOMIC MOLECULES, MOLECULAR ENERGY LEVELS, EXCITATION, SUPERSONIC FLOW, OXYGEN, HYDROGEN, USSR

Subject Categories : Aerodynamics
      Fluid Mechanics
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE