Effect of Rotating Speed on Dynamic and Economic Performance of Aero Power Plant
To investigate the influence of engine speed on the power performance and economic performance of a certain power plant in a medium-altitude long-endurance(MALE)UAV,combining with the engine speed characteristic curve,fuel consumption character-istic curve,high-altitude characteristic curve,and propeller efficiency curve,typical engine throttle was selected within the flight speed range of a UAV to match different engine speeds.Through theoretical calculation and experimental methods,the changes in pow-er performance and economic performance were evaluated.The research shows that for the power plant under study,within the range of engine speed under study,the thrust increases with the increase of engine speed,and the sfc generally decreases first and then increa-ses with the increase of engine speed,that is,there is a most economical speed,and the greater the throttle position of the engine,the higher the corresponding most economical speed.To ensure the power performance and economic performance,the matching speed of each throttle shall not be set below the most economical speed.For the studied aviation power plant,under the maximum continuous working condition,when the flight speed is constant,the thrust and propeller efficiency of the power plant decrease with the increase of flight altitude,and the sfc increases first and then decreases with the increase of flight altitude.At a certain flight altitude,the thrust of the power plant decreases with the increase of flight speed,while the propeller efficiency and sfc increase with the increase of flight speed.
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