摘要
发展了一种用于分析地面效应中瞬态飞行状态旋翼流场的理论模型,采用CB3D时间步进自由尾迹格式求解旋翼的尾迹结构,并采用面元法模拟地面对旋翼流场的影响,针对离散数值计算中出现的部分尾迹涡线落入地面下方的非物理现象,引入了"等体积"修正方法对地面下方尾迹节点的位置进行修正。新模型计算结果显示,计算所得到的地面效应中"环流"和"地面涡"等特殊流动现象的位置和涡强与试验图像符合良好,可以反映瞬态飞行旋翼地面效应中的旋翼气动力变化机理。
A new aerodynamic model was developed fo r the f low field simulation of a rotor intransient fl ight with ground effect. In the new model, a stable and efficient time-stepping wake algorithm CB3D is used to determine the wake geometry, and the ground is modeled w ith a panel method. In consideration of unphysical phenomenon that a part of the wake vortices may be generated under the ground in the numerical prediction, a constant volume rectifying method is incorporated to rectify the position of the unphysical wake vortices. The analysis results of the new model show that, fo r a rotor at various advance ratios w ith ground e f fe c t, the predicted recirculation and ground vortex f low regimes agree w ell w ith the experimental images w ith respect to the location and vor t ici ty,which could provide an insight fo r the rotor transient f ly in g in ground effect.
出处
《空气动力学学报》
CSCD
北大核心
2017年第5期650-654,共5页
Acta Aerodynamica Sinica
基金
中央高校基本科研业务费专项资金资助(NS2014011)
