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 are described. The pod conditioning system was developed by pod manufacturer, Fokker-VFW, and flight-tested by the National Aerospace Laboratory NLR. At moderate airspeeds (e.g. 400 kts), with 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 (e.g. 600 kts), 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 of a pre-production reconnaissance system, unexpected cooling problems were encountered. These problems, not experienced during previous prototype tests, 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 in the series.
The Cooling of a Pod-Mounted Avionic System
1976
7 pages
Report
Keine Angabe
Englisch
The Cooling of a Pod-Mounted Avionic System
NTIS | 1976
|Cooling of Military Avionic Equipment
SAE Technical Papers | 2015
NTIS | 1987
|