Performance of the LACV-30 Air Management System Original Configuration.
Final technical rept.,
BELL AEROSPACE TEXTRON BUFFALO N Y
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In response to early indications of excessive sand ingestion through the LACV-30 main engines and low pressures at their inlets, the inlet Air Management System was instrumented for air flows, pressures and temperatures and tested at various power conditions. These tests confirmed the presence of negative pressures at the inlets and provided data showing where the principal pressure losses occurred. Concurrent analysis of the original two-stage filtration system demonstrated that at its design filtration efficiency it would pass excessive amounts of particulates when operating in the high sand and dust environment experienced during testing at Fort Story, Va. It was concluded that a third stage of filtration must be added to the system. A modified AMS configuration incorporating additional filtration, a diffuser at the fan exit, an enlarged entrance to the engine inlet compartment, and shifting the oil cooler air load from the AMS fan to the lift system was designed and analyzed.
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