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基于非结构动态嵌套网格方法,通过求解三维非定常Euler方程对悬停共轴双旋翼直升机的复杂流场进行了数值模拟研究.双旋翼之间的干扰使得两者的拉力性能下降,上旋翼对下旋翼的干扰程度远大于下旋翼对上旋翼的影响程度.下旋翼处的下洗速度比单旋翼的要大得多,而上旋翼的下洗速度比单旋翼的略大一些,几乎相同.桨叶总距角增加,则下洗速度和拉力系数增加.双旋翼之间距离增加,则上旋翼拉力系数增加,下旋翼拉力系数减小,总拉力系数减小.
Based on the unstructured dynamic nested grid method, the numerical simulation of the complex flow field of a helicopter with a hovering co-axial rotor is carried out by solving the three-dimensional unsteady Euler equation. The interference between the two rotors reduces the tensile performance of the two helicopters. Rotor on the lower rotor disturbance degree is much greater than the lower rotor on the upper rotor of the degree of impact.Driven under the rotor at a much faster speed than the single-rotor, while the upper rotor under the washing speed is slightly larger than the single-rotor, almost The total blade pitch angle increases, then the rate of washing and pulling coefficient increases.Double rotor distance increases, the upper rotor drag coefficient increases, the lower rotor drag coefficient decreases, the total pull coefficient decreases.