Accession Number : AD0688688

Title :   AERODYNAMIC INVESTIGATION OF TURBULENT FLAME, DEVELOPING IN A FINITE COAXIAL WAKE JET,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Ershin,Sh. A. ; Voichak,V. P.

Report Date : 28 FEB 1969

Pagination or Media Count : 23

Abstract : A study was made to derive a method for determining the combustion of gases in finite coaxial wake jets. Since the theoretical operational aspect of the investigation is based on aerodynamic flame theory, preliminary investigations were made on the development of turbulent coaxial jets without combustion. Coaxial gas jets with different densities were discharged into a submerged air space from two concentric nozzles, 20 mm and 60 mm in diameter. The density difference was achieved by heating the internal jet to T(subscript 1) = 600, 900, and 1200 degree K. The temperature of external jet was maintained constant (at room temperature). In the three series of tests with different density ratios, measurements were taken of the temperature variation, dynamic pressure, and values were calculated for the flow velocity. The complete aerodynamic pattern of a turbulent diffusion flame formed in the wake of coaxial jets at different nozzle diameter ratios. A decrease in the external jet diameter results in a substantial reduction of the flame length. (Author)

Descriptors :   (*JET FLAMES, TURBULENCE), NOZZLE GAS FLOW, WAKE, DENSITY, TEMPERATURE, AERODYNAMIC CHARACTERISTICS, DIFFUSION, USSR

Subject Categories : Aerodynamics
      Fluid Mechanics
      Combustion and Ignition

Distribution Statement : APPROVED FOR PUBLIC RELEASE