Turbine Windage Torque Tests.
Final rept. 20 Aug 79-Oct 80,
ROCKWELL INTERNATIONAL CANOGA PARK CA ROCKETDYNE DIV
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Systems for producing high electrical power on demand include the use of a turbinegas generator system. The power absorption by turbine windage is an important factor in determining the sizes of the vacuum pump and drive, if the turbine exhaust cavity is to be evacuated, and the size and quality of the vacuum isolation valve on the turbine exhaust system. Rocketdyne conducted windage torque tests on a MK15E3-2 turbine at speeds up to 30,000 RPM where torque contributions of shrouded and unshrouded wheels, single wheel, and bearing and seal power losses were determined at turbine cavity air pressure of 0.3 psia to atmospheric pressure 14.3 psia. Windage torque losses of the shrouded two-wheel system at atmospheric conditions represented about 2.6 percent of the overall rated turbine horsepower 155 versus 6,000 HP. Author
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