Accession Number : AD0824243

Title :   INVESTIGATION OF AIR-AUGMENTED ROCKET COMBUSTION AND MIXING PROCESSES.

Descriptive Note : Technical progress rept. no. 2, 1 Feb-15 Sep 67,

Corporate Author : ATLANTIC RESEARCH CORP ALEXANDRIA VA

Personal Author(s) : Sargent,W. H. ; Anderson,R. ; Duvvuri,T.

Report Date : OCT 1967

Pagination or Media Count : 123

Abstract : Apparatus to examine coaxial jet mixing was designed, fabricated and 'shaken down'. Wall static pressure data varied markedly in range and form in response to secondary and primary stream parameters of flow and state, and the primary stream generator operated smoothly through a wide range of preselected flow rates and compositions. Temperatures from 1000 to 3000K were generated in the primary stream, and solid particle loadings up to 50 percent by weight were flowed. Pressure and temperature structure of the secondary flow was mapped, turbulance intensity was estimated, and effects of solid particles on the secondary mixing process were examined. Solutions were developed for the turbulent mixing of gas/particle streams. The solutions indicate that particle dispersion into the secondary stream is slow due to mixing alone. Potential core length of the primary stream was increased by increasing velocity ratio but was relatively unaffected by the range of temperature ratios examined. Further analysis was undertaken of Macek's boron combustion data in which the effects of velocity lag and particle preloading in the injector were discussed. Burn times (time following ignition) for boron particles were estimated assuming a diffusion-controlled process. In addition, apparatus is being developed to study the ignition and combustion of single boron particles. (Author)

Descriptors :   (*ROCKET ENGINES, *COMBUSTION), JET MIXING FLOW, FLUID DYNAMICS, IGNITION, BORON, PARTICLES, SECONDARY FLOW, TURBULENCE, TRANSPORT PROPERTIES, MIXTURES, DIFFUSION, AIR, COMBUSTION CHAMBERS

Subject Categories : Fluid Mechanics
      Combustion and Ignition
      Rocket Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE