航空发动机分流环水滴撞击特性研究

Characteristics of the water droplets impingement on the splitter ring of aero-engine

为了研究航空发动机分流环的防冰需求,利用LEWINT软件对分流环的简化结构进行了水滴撞击特性计算。结果表明:分流环前缘区域水滴局部撞击率最高,上表面靠近前缘的区域和下表面前段有水滴撞击;随着来流速度增大,分流环总撞击率逐渐增大,撞击极限先增大然后缓慢减小;随着来流攻角增大,下表面局部撞击率逐渐增大,上表面撞击极限逐渐减小,分流环总撞击率逐渐增大,撞击极限逐渐减小,来流攻角超过6°撞击极限几乎不再变化;随着水滴直径增大,分流环局部撞击率、总撞击率、撞击极限逐渐增大;与水滴直径S-S分布相比,L-D分布的前缘局部撞击率偏小,分流环撞击极限偏大,总撞击率随水滴直径增大先偏大后偏小。分析结果可为分流环防冰设计提供参考。

In order to understand the anti-icing requirements for the splitter ring splitter ring of aero-engine,the water droplet impingement characteristics on the simplified structure of the splitter ring were calculated by LEWINT software.The results show that the local impingement efficiency is the highest on the leading edge of the splitter ring.There are water droplets impinged on the front section of the lower surface and the area near the leading edge of the upper surface.With the increase of incoming airflow velocity,the total impingement efficiency of the splitter ring gradually increases,the impingement limit first increases and then slowly decreases.With the increase of attack angle,the local impingement efficiency of the lower surface gradually increases,the impingement limit of the upper surface gradually decreases,the total impingement efficiency of the splitter ring gradually increases,the impingement limit of the splitter ring gradually decreases,and when the attack angle exceeds 6°,the impingement limit hardly changes.With the increase of droplet diameter,total impingement efficiency,local impingement efficiency and the impingement limit all gradually increase.Compared with the S-S distribution of water droplet diameter,the local impingement efficiency of the L-D distribution is smaller on the leading edge of the splitter ring,the impingement limit of the splitter ring is larger,and the total impingement efficiency first increases and then decreases with the increase of water droplet diameter.The calculation results can provide a reference for the anti-icing design of the splitter ring.