螺旋桨滑流对短舱/机翼构型尾迹流场的影响

螺旋桨滑流对飞机机翼表面流动和尾迹流场有重要的影响，进而改变机翼和飞机的性能。本文通过风洞试验方法开展了螺旋桨滑流对尾迹流场的影响研究。试验模型为后掠角4°、带增升装置的螺旋桨/短舱/机翼模型，试验构型包括襟翼收回和襟翼打开，试验策略是在两种构型下分别同时模拟真实飞行状态的拉力系数和前进比。通过比较有/无螺旋桨时空间尾迹流场的速度场和流动偏角等，分析滑流在尾迹流场中的发展规律和影响范围，研究尾迹流场中滑流的加速效应、下洗和侧洗效应等。结果表明，在滑流作用下，机翼远后方流场参数在机翼展向和垂直方向上均呈现复杂的变化；同时，襟翼收回和襟翼打开构型的滑流效应有明显的区别，影响规律也有所不同。

Effect of propeller slipstream on wake field of a nacelle/wing configuration

The slipstream of propeller greatly influences the flows on wings and wakes due to high swirl velocities, and thus alters the performance of the wing and the aircraft. In this paper, the effects of propeller slipstream on the wake flow are investigated using wind tunnel test. The experimental model includes a 6-bladed propeller, a nacelle and a wing with high lift device at the sweep angle of 4°, and two configurations of flap deflection or retraction are tested. The thrust coefficient and advance ratio of two configurations at real flight are simulated at the same time. By comparing the flow velocities and directions at the wake with and without propeller slipstream, the development and influence of slipstream on wake flow are analyzed, and the slipstream effects including accelerating effect, downwash effect and sidewash effect are investigated. The test results show that, under the influence off slipstream, the flow parameters in far wake show complex variation on horizontal and vertical directions; and a clear distinction of the slipstream effects is shown under flap-deflection and retraction configurations.