Abstract
The use of gases bled from a propulsion unit as an energy source for auxiliary power units (APU's) has been investigated and shown to offer significant weight and envelope savings in comparison with conventional warm gas generators. The principal challenge associated with this use of chamber-bled gases lies in conditioning the hot, particle-laden gases to a state compatible with the energy transfer device (e.g., turbine, air motor). Filter designs which remove 100% of the metallic particles in the exhaust gas and which have efficiently reduced chamber gas temperature by thermal decomposition of a sacrificial material have been demonstrated. Four candidate coolant materials have been characterized by subscale testing. Heat transfer models have been formulated which adequately predict the performance of coolant bed designs. Two full-scale demonstration tests of a combined filter-cooler have been conducted. Approximately 8 hp was delivered to a hydraulic actuation system for the 21.4and 40.3-sec test durations.
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