摘要
基于多参考系方法,利用RANS方程对某型螺旋桨飞机的全机有滑流和无滑流空间流场进行了数值模拟,分析了滑流在机翼干扰作用下的发展趋势,机翼气动特性在滑流作用下的改变,滑流对飞机失速特性的影响。研究结果表明,螺旋桨旋转卷起的涡流经机翼时被切割成上下两部分,形成了绕机翼的横向二次流,机翼的存在改变了滑流的涡量分布和涡的结构。在弦向,滑流影响最严重的部位是机翼前缘,滑流旋转效应改变了机翼绕流的当地迎角,加速效应增加了桨后气流的速度,这是引起机翼气动特性改变的主要原因。虽然滑流的诱导作用使机翼外段提前发生了分离,但是其推迟了机翼根部分离现象的发生,改善了飞机的失速特性。
The flow field of a turbo prop airplane with and without slipstream have both been numerically simulated with RANS equations based on MFR（multiple frames of reference） in this article.The development of the slipstreams under the interference of the wing and the aerodynamic interference effect of the propeller slipstream on the wing has been analyzed,which shows that the vortices caused by propeller are separated into two parts and form the secondary lateral flow,with vorticity distribution and structure altered by the wing.The wing leading edge is the part affected by the slipstream most along the chord direction,for that slipstream alters the local angle of attack of the wing and the flow behind the propeller is accelerated,which is the core factor that influences the wing aerodynamic performance.Although the induction effect of the slipstream makes the separation on the outboard part of the wing occur earlier,it delays the separation on the wing root,which improves the stall performance of the plane.
出处
《航空计算技术》
2012年第2期87-91,共5页
Aeronautical Computing Technique
关键词
螺旋桨滑流
多参考系
气动干扰
数值模拟
propeller slipstream
multiple frames of reference
aerodynamic interference
numerical simulation
