直 升 机 多 管 式 分 离 器 结 冰 及 压 降 损 失

The effects of ambient temperature，average volume diameter of water droplets，incoming flow velocity，liquid water content on vortex tube icing and the resulting pressure loss were studied for the problem of inlet pressure loss caused by icing in helicopter multi-tube separators. The calculation results show that the liquid water content exerts the greatest effect on the lip icing of the helicopter vortex tube，followed by ambient temperature，incoming flow velocity，and the average volume diameter of water droplets. The vortex tube pressure loss increases with the increase of icing thickness，and the importance of addressing pressure losses induced by lip icing is emphasized. Lower ambient temperature results in more serious lip icing of the vortex tube. The larger average volume diameter of water droplets leads to increased icing area on the outer surface of the vortex tube lip，with a reduction in the icing area inside the vortex tube. Decreased incoming flow velocity results in more serious icing inside the lip of the vortex tube，while increased incoming flow velocity leads to larger icing area on the surface of the vortex tube lip. Increased liquid water content leads to a significant increase in ice formation，both on the surface of the vortex tube lip and inside the lip，with an increase in icing thickness and coverage.