A High Altitude Long Endurance Remotely Piloted Vehicle (HALE RPV) concept is currently being studied by the Naval Air Development Center. Plans are for initial demonstrator vehicles to be powered by two turbocharged, liquid cooled, piston engines. A major objective is to minimize fuel consumption so that the vehicle can stay a loft at greater than 60.000 feet for several days at a time. Waste heat from the engine coolant and turbochargers may drive a reverse Rankine cycle, producing electrical power for the vehicle's radar and avionics. A nonazeotropic refrigerant mixture was selected as the working fluid for this study because it produces a higher cycle efficiency than single refrigerants. The Rankine cycle, with its advantages and disadvantages, is compared with a baseline, direct heat rejection system. When using the cycle during a candidate mission, the vehicle endurance may be increased by up to seven percent. While the waste heat recovery system in this paper is particularly geared for the Navy high altitude RPV, the general principle would be applicable to other vehicles with critical endurance requirements and large heat sources.
Waste heat recovery system for high altitude application of liquid cooled, piston engines
Abwaermerueckfuehrungssysteme fuer Anwendung in grossen Hoehen von fluessiggekuelten Kolbenmotoren
AIAA-Papers ; Jul ; 1-6
1987
6 Seiten, 5 Bilder, 3 Tabellen, 5 Quellen
Conference paper
English
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