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Aerodynamics Analysis of Twin-Turboprop Aircraft with Propeller Slipstream Effects Considered

Wang Wei;Duan Zhuoyi;Geng Jianzhong;Wang Bin;Ding Xinzhi;AVIC The First Aircraft Institute;  
Aerodynamic interaction of propeller slipstream with aircraft parts will lead to significant influence on the complete twin-turboprop aircraft. Taking the twin-turboprop aircraft for example,the effects on the complete aircraft due to propeller slipstream and the normalized translation of horizontal wing under different thrust coefficient are studied by numerical simulation based on multiple reference frames(MRF) techniques. The research results and their analysis show preliminarily that: due to the effects caused by slipstream of propellers,the lift and drag will increase correspondingly,while the lift-drag ratio will decrease and the pitching moment will become unstable at the small AOA; with the increasing of thrust coefficient,the lift coefficient will increase by 40%,the Cd will increase by 150%,the lift-drag ratio will decrease by 50%,the inflection point at small angle of attack will increase by 8 degrees and the pitching static margin will decrease by 30%; rationally moving the horizontal wing down will make use of the slipstream effects,which will improve the pitching moment characteristics. The investigation is believed to be of some reference value to the design of twin-turboprop aircraft.
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