基于嵌套网格的舰载直升机流场仿真及风限图计算

Simulation of flow field and calculation of safe operating envelope of shipborne helicopter based on chimera grid

为保证舰载直升机的安全,本文基于嵌套网格方法,针对CG-47提康德罗加级巡洋舰搭载UH-60"黑鹰"直升机的机舰组合进行了流场仿真。研究了此组合在不同风向角及风速下的着舰流场,并结合飞行力学模型计算了直升机操纵量和姿态角。根据安全着舰判据,绘制了此组合的理论风限图。结果表明:滚转角及周期变距操纵量均随来流速度增加,俯仰角则受到来流和舰上建筑的多重影响。风向角越小,最大着舰速度越大,且总体左侧大于右侧。

In order to ensure the shipboard helicopter safety, based on the chimera grid method, the flow field of CG-47 Ticonderoga class cruiser with UH-60 Black Hawk helicopter was simulated. The flow field of this combination under different wind direction angles and speed conditions was studied. The flight dynamics model was used to calculate manipulated variable and attitude angle. Finally, according to the safe landing criterion, the theoretical safe operating envelope of this combination was drawn. The results showed that the roll angle and periodic pitch control increased with the incoming velocity, while the pitching angle was affected by the incoming flow and the ship structure. The smaller wind direction angle meant the greater maximum landing speed. Generally, the left side speed was larger than the right side speed.