Accession Number : AD0787865

Title :   Investigation of Centrifugal Force and Reynolds Number Effects on Combustion Processes.

Descriptive Note : Interim rept. Jun 73-Jan 74,

Corporate Author : PRATT AND WHITNEY AIRCRAFT WEST PALM BEACH FLA FLORIDA RESEARCH AND DEVELOPMENT CENTER

Personal Author(s) : Lewis,George D. ; Smith,Clifford E.

Report Date : AUG 1974

Pagination or Media Count : 54

Abstract : During the period between 30 June 1973 and 30 June 1974, tests in a combustion centrifuge have demonstrated that increased buoyancy produced by centrifugal force can be used to increase flamespeeds significantly over turbulent Flamespeed, which controls combustion rates in conventional burners. A preliminary model has been developed that predicts the flamespreading rate at various burner conditions. Comparison with experimental data obtained from a scale model afterburner operating on the buoyant flamespreading principle confirms the model predictions. In addition, a second model, based on classical heat transfer correlations, has been developed to predict with reasonable accuracy the extinction limits of flames at very high centrifugal force values. The effects of Reynolds number on turbulent flamespeeds of propane-air and hydrogen-air mixtures have also been measured. (Author)

Descriptors :   *Combustion, *Flame propagation, Centrifugal force, Flames, Combustion stability, Centrifuges, Reynolds number, Turbulence

Subject Categories : Combustion and Ignition

Distribution Statement : APPROVED FOR PUBLIC RELEASE