Heat Elimination in Airplane Wheel Brakes With Heavy Thermal Loads.

摘要

A new fan-ventilated type of wheel brake for modern, heavy, high-speed landing airplanes is described. It incorporates a built-in fan driven by a fractional h.p. electric motor located in the wheel axle. The fan draws air through the wheel and creates forced ventilation to counteract the heating of brakes, wheels, and tire beads. Laboratory and field tests have shown that, with the fan in operation, the brake cooling rate was considerably increased and the so-called turn-round time (time measured from the moment of the normal fully-braked stop till the brakes being cooled to 200 degrees centigrade) was reduced from 70 minutes to 13 minutes. Also the peak temperatures of the tire beads and hydraulic fluid were reduced below critical values, i.e. from 140 degrees centigrade (without fan) to 102 degrees centigrade (with fan), and from 166 degrees centigrade to 58 degrees centigrade, respectively. (Author)