滑流对涡桨飞机进气道气动性能影响的研究

螺旋桨滑流产生的加速效应、旋转效应、粘性效应等对于处于后方的进气道性能有显著的影响。基于计算流体力学方法(CFD)，通过求解非定常 RANS方程，采用滑移动态网格技术来模拟螺旋桨的旋转，建立考虑螺旋桨滑流的飞机进气道气动特性数值仿真方法；以某多轴式涡桨动力系统为研究对象，对螺旋桨滑流对进气道内流的影响进行分析。结果表明：在地面与起飞两个大拉力状态下，有滑流进气道出口总压恢复系数较无滑流的有所提高；而巡航状态下有滑流进气道出口总压恢复系数却降低，除地面小速度状态外，在起飞以及巡 航飞行状态下,滑流会增加进气道出口总压畸变指数。

Numerical simulations study about the effect of propeller slipstream on inlet flow field for a turboprop aircraft

Due to the small distance between the inlet port and the propeller blade, the propeller slipstream has a great impact on inlet flow field. In order to study this impact, unsteady CFD Methods are used to simulate inlet aerodynamic performance under the influence of propeller slipstream. The results show that: in the state of on ground and takeoff, the exit total pressure recovery coefficient is higher with slipstream than without it while the exit total pressure recovery coefficient is lower with slipstream in cruise flight. The primary factors cause the difference lie in whether propeller in front of the inlet does work to the airflow. Besides,when the flow from side channel flow backwards into inlet, the propeller slipstream will increase the distortion factor of the flow at the exit. The reason is that the slipstream will cause perturbation to the inlet flow field as propellers sweep past the inlet periodically. Also, the propeller wake will flows into inlet periodically. Thus, both of the two reasons will reduce the uniformity of the flow field in the inlet.