发动机进排气系统对飞机气动特性影响的数值研究

为了分析发动机与飞机系统耦合过程中产生的气动力特性,准确获取实际使用条件下的飞机升阻特性,以带动力的某半模飞机模型为研究对象,开展了三维流场数值仿真计算,利用风洞试验数据对计算方法进行了验证,总结了溢流阻力及排气干扰阻力的变化规律,结果表明:发动机状态变化对飞机升阻特性影响明显,在选定的发动机工作参考状态下,溢流阻力在飞机系统升力与阻力方向的分量随捕获面积比的增大分别增大、减小,排气系统实际工作状态偏离选定的参考状态越远,干扰阻力在飞机系统升力和阻力方向分量的绝对值越大。

Numerical study on the influence of aero-engine intake and exhaust system on aerodynamic characteristics of aircraft

In order to analyze the aerodynamic characteristics between aero-engine and aircraft, and to accurately determine the lift-drag characteristics of aircraft under practical use condition, numerical calculation was conducted for a half aircraft model with powerplant. Then the numeical calculation method of three-dimensional flow field was verified with wind-tunnel test data, and the rules of the spillage drag and exhaust interference drag were summarized. Results suggest that: the variation of aero-engine settings has significant influences on the lift-drag characteristics of aircraft. The spillage drag component in lift and drag direction separately increases and decreases with the increase of capture area ratio. The larger difference between real operating condion and reference conditon means the larger absolute value of interference drag components.