尾吊发动机短舱安装对机翼高速升阻特性的影响研究

尾吊式发动机短舱在全机影响下的气动设计十分复杂,其与机翼、机身、平尾等部件的气动干扰对全机的气动特性有较大影响.为了评估短舱安装对机翼高速升阻特性的影响,本文在计算流体动力学软件Fluent中对某型飞机的全机流场进行了数值模拟,着重考察了有无短舱以及短舱安装在不同位置对机翼表面流场的影响情况.计算结果表明,尾吊式发动机短舱安装将导致机翼升、阻力系数降低,但升阻比会有所提高;短舱安装越靠近机翼,机翼升、阻力系数下降越大,而升阻比越高.

Study on the Effect of Tail-suspended Engine Nacelle Installation on High Speed Lift-to-drag Characteristic of Wing

Aerodynamic design of tail-suspended engine nacelle under the effect of whole aircraft is very complex： the aerodynamic influence between the engine nacelle and wing, fuselage and horizontal tail has great effect on aerodynamic characteristic of whole aircraft. In order to evaluate the effect of nacelle installation on high speed litttn-drag characteristics of wing, numerical simulation has been condncted for the flow field of a certain type of aircraft in calculation fluid dynamics software Fluent, the effect of aircraft with or withot, t nacelle and difterent installation position of nacelle on the flow fieht on the surface of wing have Deen surveyed partit.ularly in the paper. The calculation result shows that the installation of tail-suspended engine nacelle will resuh in reducing of wing litt anti drag coefficients, but lilt-to-drag ratio is improved; the closer installation of nacelle near the wing is, the larger re- duction in wing lift and drag eoefficients is and the higher lift-to-drag ratio is.