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Direct Mixing and Combustion Measurements in Ducted, Particle-Laden Jets.
BRIGHAM YOUNG UNIV PROVO UTAH DEPT OF CHEMICAL ENGINEERING
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Using water-cooled probes and hot-gas valves, gas-particle samples were withdrawn from the secondary duct of an air-augmented laboratory burner. Using a boron-loaded propellant, airfuel ratio and secondary duct pressure were varied from 121 to 321 and from 82 to 127 psia respectively. From sample analysis of chlorine, argon air tracer, boron, and boron oxide, radial and axial profiles of air, gaseous fuel, particulate fuel and percent of boron combustion were determined. Particles and gases mixed at significantly different rates. Measured gas-phase mixing rates were more rapid than model predictions, which assumed particles to be in equilibrium with gases. Boron combustion efficiency varied markedly with duct position, airfuel ratio and secondary chamber pressure. Author
APPROVED FOR PUBLIC RELEASE