A three-stage 4.54-inch-mean-diameter reverse-flow reentry turbine was designed and evaluated experimentally in cold air. This turbine was designed for a blade- to jet-speed ratio of 0.244, a total- to static-pressure ratio of 14.5, and a rotative speed of 22,436 rpm.nAt design speed and pressure ratio, the equivalent specific work output ob¬tained was 38 Btu per pound at a static efficiency of 0.57, which compare to de¬sign values of 41.8 and 0.63, respectively. A single-stage test of the turbine showed that, because of overexpansion, the first stage produced slightly more than its design work. A study of the weight-flow variations through the turbine affected by leakage flows is also presented.
展开▼
