短舱涡流发生器流动控制机理初探

首先回顾了短舱涡流发生器在民机研制中的应用及发展历程,然后结合民用飞机研发实践,借助于CFD工具初步计算并着重分析了短舱涡流发生器的流动控制机理。结果分析表明合理设计的短舱涡流发生器能够产生能量较强的集中涡,在分离敏感的短舱后翼面区域产生下洗流场并为边界层注入能量,降低短舱后气流的当地有效迎角,延缓由于"挂架涡"提前破裂而导致的大面积分离,从而能够改善失速区形态。

Preliminary Investigation on Flow Control Mechanisms of Nacelle Strake

Applications and developments of a kind of vortex control device, the nacelle strake, are first reviewed. Underlying flow control mechanisms are then demonstrated through CFD simulations. Once the nacelle strake is properly designed and installed, strong vortices shed from the strake can produce upwashes and reenergize the separation-sensitive boundary layer on the upper wing behind the nacelle. The stall characteristics are improved by lowering the effective angle of attack and delaying premature bursts of the pylon vortex.