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本文研究了贴地飞行的重要气动问题—地面涡现象。通过对旋翼近地尾迹的分析,建立了计算地面涡的离地高度、纵向位置和强度的计算模型、公式和方法,并以此计算了桨盘处诱导速度分布。计算结果与实验值作了比较,达到了相当好的一致性。
This paper studies the important aerodynamic problem of surface-mounted vortex-ground vortex phenomenon. Based on the analysis of the wake of the rotor, the calculation model, formula and method for calculating the ground clearance, longitudinal position and strength of the ground vortex are established and the induced velocity distribution is calculated. The calculated results are compared with the experimental values, reaching a very good consistency.