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基于Beddoes-Leishman(B-L)动态失速模型,对前缘涡的分离条件和位置进行了修正,并采用了量纲为一的时间参数对前缘涡的累积和涡的移动在时间尺度上做更合理的建模,建立了涡位置和涡增量的关系,另外,改进了气流的再附着条件。算例表明采用修正后的B-L动态失速模型,能够有效地改善低马赫数下垂直力系数和力矩系数突变的临界点和峰值,而且改进了一般修正模型对气流再附着段的判断,有助于提高直升机在大机动飞行时旋翼大交变载荷的计算准确性。
Based on the Beddoes-Leishman (BL) dynamic stall model, the separation conditions and locations of the leading edge vortex are modified, and the cumulation of the vortex and the movement of the vortex are modified on the time scale Reasonable modeling, the establishment of the relationship between the vortex position and the eddy increments, in addition, improved air re-attachment conditions. The numerical examples show that the modified BL dynamic stall model can effectively improve the critical points and peak values of the vertical force coefficient and the torque coefficient mutation at low Mach numbers and improve the general correction model to judge the reattachment of airflow, Raise the Computation Accuracy of Large Alternating Rotor Load of Helicopter in Large Maneuver.