Accession Number : AD0686231

Title :   EFFECTIVENESS OF A GAS CURTAIN ON A TUBULAR SURFACE,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Volchkov,E. P. ; Levchenko,V. Ya.

Report Date : 16 DEC 1968

Pagination or Media Count : 13

Abstract : Experiments were made to determine the efficiency of cold gas jets used for protecting duct walls from the heat transferred from a main gas stream. Cold air and air preheated to 55-100C were used as the hot and cold gases. The cold air was injected at 1-6 m/sec through a slit parallel to a corrugated wall consisting of ebonite cylinder sections. These sections were mounted on a panel and placed in the 150-mm-wide rectangular test section. Velocity and temperature profiles were measured at the inlet and in various cross sections of the test section. The data were correlated in terms of the main gas flow viscosity, wall temperature, Reynolds number, and distance from the inlet. The efficiencies of cold gas jets for protecting smooth and corrugated walls are compared. (Author)

Descriptors :   (*NOZZLE GAS FLOW, COOLING), HEAT TRANSFER, JET MIXING FLOW, TURBULENT BOUNDARY LAYER, VISCOSITY, REYNOLDS NUMBER, DUCTS, BAFFLES, TEST METHODS, EFFICIENCY, CORRELATION TECHNIQUES, SURFACE ROUGHNESS, USSR

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE