The Cooling of a Pod-Mounted Avionic System
NATIONAL AEROSPACE LAB AMSTERDAM (NETHERLANDS)
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The paper describes the principles and testing of the air cooling of the pod-mounted Orpheus day and night aerial reconnaissance system, since 1974 operational with the Royal Netherlands Air Force. At ram air temperatures up to 44 C, cooling is provided by ambient air entering the pod through a flush air intake in the nose, and leaving it through slots in the pod belly. In low level flight at high subsonic speeds, with ram air temperatures up to 79 C, the cooling air temperature is kept below 50 C by spraying an automatically controlled amount of water into the airflow near the intake. During the flight testing unexpected cooling problems were encoutered, that could be shown to originate in the NACA flush air intake. By changing to a flush air intake with parallel side walls the cooling system could be made to perform to entire satisfaction.
- Patrol and Reconnaissance Aircraft
- Air Conditioning, Heating, Lighting and Ventilating
- Optical Detection and Detectors
- Infrared Detection and Detectors