迷你翼梢小翼增升减阻效应

Lift enhancement and drag reduction effect of mini winglet

选取某窄体客机的翼梢小翼为研究对象,采用Spalart-Allmaras模型对无翼梢小翼、全尺寸翼梢小翼和迷你翼梢小翼3种机翼构型进行数值模拟,通过流场分析和速度分解等手段,研究翼梢小翼的增升减阻机理。结果表明:迷你翼梢小翼有恢复涡核流速、减弱涡流掺混程度和梳理翼梢气流的作用;增升减阻的关键在于迷你翼梢小翼对气流方向的修正;翼梢小翼的局部流动差异会对整体机翼近场造成影响。由于尺寸较小,迷你翼梢小翼能在较大攻角范围内改善传统翼梢小翼的性能,具有一定的实践意义。

Taking the winglet of a narrow-body aircraft as the object,the numerical simulations of three types of wing configuration are carried out using Spalart-Allmaras model,including wingless,full-size winglet and mini winglet.The mechanism of lift enhancement and drag reduction of winglet is studied by means of flow field analysis and velocity decomposition.The results show that the mini winglet can renew the turbulence core velocity,weaken the mixing degree of turbulence and straighten out the wingtip airflow.The key of lift enhancement and drag reduction is the airflow direction correction owing to mini winglet.The local flow difference of winglet will affect the near field of whole wing.Owing to the small size,the mini winglet can improve the performance of traditional winglet in a wide range of attack angle.It has certain practical significance.