Accession Number : AD0671588

Title :   CALCULATION OF CONDENSATION SHOCKS IN A RELATIVELY LOW PRESSURE RANGE (RASCHET SKACHKOV KONDENSATSII V OBLASTI NEBOLSHIKH DAVLENII),

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Stepanchuk,V. F. ; Saltanov,G. A.

Report Date : 29 AUG 1967

Pagination or Media Count : 13

Abstract : In general, in a stream of wet steam there appear oblique condensation jumps. A condensation jump is followed by a bunch of rarefaction waves, the first characteristic of which coincides with the front of the jump. The velocity of sound in the region of small moisture contents is sufficiently close to the velocity of sound in dry saturated steam which, in turn, is determined as a =(kRT) to the 1/2 power. The equation pV-RT is applicable to the supercooled steam up to the condensation jump and to the saturated steam after the condensation jump. The article makes the following simplifying assumption: in the region of small pressures (for water vapor the static pressure in front of the condensation jump is less than 50,000 newtons/sq. m), it can be assumed that the saturation temperatures before and after the condensation jump are equal. This applies also to the latent heat of evaporation. In calculation of a condensation jump, the given quantities are p sub o, T sub o, and the geometry of the nozzle. The problem can be solved either on the basis of the kinetics of the phase transitions in a stream of supercooled steam, which leads to difficult calculations, or on the basis of an empirical expression. Further calculation of the condensation jump is carried out on the basis of the equations of gas dynamics: the equation of continuity, the momentum equation, and the energy equation. The results are correlated and presented in the form of a nomograph for the easy calculation of the condensation jumps. (Author)

Descriptors :   (*SHOCK WAVES, EQUATIONS OF MOTION), LOW PRESSURE, MOMENTUM, ENTROPY, NOZZLE GAS FLOW, LAVAL NOZZLES, SUPERCOOLING, CONDENSATION, USSR

Subject Categories : Aerodynamics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE