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Fuel Spray Ignition by Hot Surfaces and Aircraft Fire Stabilization
Final rept. 15 Nov 1981-31 Mar 1986
PURDUE UNIV LAFAYETTE IN THERMAL SCIENCES AND PROPULSION CENTER
Pagination or Media Count:
In Task 1 an experimental study of the ignition of Jet-A fuel sprays by an isothermal hot surface was conducted in a vertical axisymmetric duct. In addition to measurements of the wall temperature necessary for ignition, local measurements of velocity, turbulence intensity, fuel concentration, and the fraction of fuel vaporized were measured in the boundary layer at surface temperatures just below that required for ignition. In Task 2 two combustion tunnel facilities were used to investigate the stabilization of aircraft fires. Results showed that the shape of a bluff-body flameholder affects its stability characteristics through its influence on the size and shape of the wake region. Another significant finding was that the flameholding properties of the single-vortex flow pattern are markedly superior to those of the double-vortex pattern. In Task 3 experimental studies were conducted on 1 Entrainment of an external flow into a cavity, with a small opening or vent in a side wall, when there is a small flow through the cavity and 2 Fluid dynamics and ignition and flame stability characteristics of a jet of gaseous fuel through a protrusion of different shapes and heights in the wall of a cavity with a small flow of air through the cavity.
APPROVED FOR PUBLIC RELEASE