Testing of turbo-shaft engines requires power absorption devices that must be capable of stable operation at both variable powers and speeds (idle, take-off, cruise). A dynamometer transfers the engine shaft power to the incoming fluid and transforms it into thermal energy. An air-dynamometer has many advantages and is preferred over water brakes or electric generators, but must be made to operate stably over a wide range of speeds and powers.
The Application of Air Dynamometers for Testing Turbo-Shaft Gas Turbine Engines
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Foor, WB, & Jansen, W. "The Application of Air Dynamometers for Testing Turbo-Shaft Gas Turbine Engines." Proceedings of the ASME 1984 International Gas Turbine Conference and Exhibit. Volume 1: Turbomachinery. Amsterdam, The Netherlands. June 4–7, 1984. V001T01A059. ASME. https://doi.org/10.1115/84-GT-216
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