Hydraulic Fluid Temperature Control on Aircraft Requiring Long Endurance at Supersonic Speeds 640327
Aircraft which fly at supersonic speeds for long periods of time encounter conditions which require incorporation of a hydraulic fluid cooling system. This system can be designed to operate automatically over a wide range of conditions.
On-board heat sinks may be used in one of several possible arrangements. Fuel and air as heat sink media are commonly used in the type of aircraft under consideration.
Prediction of hydraulic fluid temperatures in the elevated temperature range is possible and feasible. Flight testing has verified the method presented herein.