双发直升机回避区曲线研究

Research on the H-V diagram curve for twin-engine helicopter

针对直升机安全飞行和双发直升机回避区曲线更为复杂的问题开展了研究。首先,提出了双发直升机回避区双曲线的概念,并总结了双发直升机回避区曲线的关键参数点。然后,提出了一种基于功率/能量平衡关系的双发直升机回避区曲线的计算方法,对双发直升机单发失效(OEI)和全发失效(AEI)时的回避区进行了区分,并以垂直速率法确定了双发直升机低速回避区拐点和高速回避区起始点的速度。最后,进行了算例计算及结果分析。研究结果表明,所提出的垂直速率法在计算双发直升机回避区曲线时有较高的精度,得到的结论合理可行。

A study was carried out to solve the problem of safe flight of helicopters and more complex H-V diagram curve of twin-engine helicopters. Firstly, this paper proposed the concept of twin-curve for the twin-engine helicopter H-V diagram, and summarized the key parameter points of the twin-engine helicopter H-V diagram curve. Then, a calculation method for the H-V diagram curve of the twin-engine helicopter based on the power/energy balance relationship was proposed. The H-V diagram in the case of one engine inoperative(OEI) and all engines inoperative(AEI) of the twin-engine helicopter was distinguished, and the vertical velocity method was used to determine the speed of the turning point of the helicopter’s low-speed H-V diagram and the starting point of the high-speed H-V diagram. Finally, an example calculation was performed and the results were analyzed. The results show that the vertical velocity method proposed in this paper has a high accuracy in calculating the H-V diagram curve of the twin-engine helicopter, and the obtained conclusion is reasonable and feasible.