旋翼结冰对直升机悬停性能影响的数值分析

Numerical Analysis on Effects of Rotor Icing on Helicopter Performance in Hover

目的研究旋翼结冰对直升机悬停性能的影响。方法选取具有充分试验数据的UH-1H直升机为算例,采用Fluent计算旋翼流场,将收敛后的流场文件导入Fensap-ICE中进行水滴撞击和结冰计算,得到结冰后的旋翼外形后,再采用Fluent计算旋翼流场,从而分析旋翼结冰对直升机悬停性能的影响。结果通过改变结冰条件,分析了不同结冰条件对直升机悬停效率的影响,表明旋翼结冰会显著降低直升机的悬停效率,且随着结冰时间、水滴平均直径(MVD)和液态水含量(LWC)的增大,直升机的悬停效率逐渐降低。结论不同结冰条件对直升机悬停效率下降趋势的影响不同,随着结冰时间的增大,悬停效率基本呈线性下降,而随着MVD和LWC的增大,悬停效率的下降趋势逐渐变缓,下降幅度逐渐减小。

The paper aims to study the effects of icing on rotor on helicopter performance in hover.The UH-1H helicopter with sufficient experimental data was selected as an example.The flow field of rotor was calculated with Fluent.After convergence,the flow field file was imported into Fensap-ICE for droplet impingement and ice accretion calculation to obtain the rotor shape after icing.Then,the flow field of rotor with ice accretion was calculated with Fluent to analyze the effect of icing on rotor on helicopter performance in hover.By changing the icing conditions,influences of different icing conditions on helicopter hover efficiency was analyzed.The results showed that the icing on rotor significantly reduced the helicopter hover efficiency,and the hover efficiency decreased with the increase of ice accretion time,median volume diameter(MVD)and liquid water content(LWC).Different icing conditions have different effects on the downtrend of helicopter hover efficiency.With the increase of icing time,the hover efficiency decreases linearly.But with the increase of MVD and LWC,the downtrend of hovering efficiency gradually slows down,and the decline gradually decreases.