蛇形进气道影响下发动机进口部件水撞击特性的数值研究

发布时间：2018-06-30 18:21

本文选题：蛇形进气道 + 欧拉/欧拉法　；参考：《推进技术》2016年12期

【摘要】：为了了解亚声速蛇形进气道影响下航空发动机进口段迎风表面处的水滴撞击特性,采用欧拉/欧拉法对蛇形进气道和发动机进口段在来流马赫数为0.3及环境温度为266.5K的大气结冰条件下进行了空气/过冷水滴两相流场的计算,再由已获得的水滴流场进行支板表面水撞击特性的计算。整流罩表面水滴的撞击计算时采用插值的方法将原两相流场的计算结果插值到新生成的整流罩的近壁网格处,之后采用新生成的整流罩面网格进行水撞击特性的计算。通过计算获得了发动机进口结冰参数、支板以及整流罩表面水收集系数的分布。计算结果表明整流罩和支板表面水滴撞击的主要区域与进气道的弯曲方向有关且位于其下表面一侧,最大水收集系数达到0.98。与之相对比的整流罩和支板其他区域的水收集系数则显得非常微小,在数值上约等于0。此外,对于与进气道对称面平行的竖直支板,其与机匣相交的区域存在水收集系数为0遮蔽区。
[Abstract]:In order to understand the impact characteristics of water droplets on the upwind surface of the inlet section of an aeroengine under the influence of a subsonic snake inlet, Euler / Euler method was used to calculate the two-phase air / subcooled water droplet flow field in the snake-shaped inlet and the inlet section of the engine under the condition of ambient temperature 266.5K and Mach number 0.3. Then the water impact characteristics on the surface of the supporting plate are calculated from the obtained water droplet flow field. In the calculation of the impact of water droplets on the fairing surface, the results of the original two-phase flow field are interpolated to the near wall grid of the newly generated fairing, and the water impact characteristics are calculated by the newly generated rectifier overlay mesh. The distribution of the inlet ice parameters, the water collection coefficient on the surface of the supporting plate and the fairing is obtained by calculation. The results show that the main area of water droplet impact on the fairing and branch plates is related to the bending direction of the inlet and is located on the lower side of the inlet. The maximum water collection coefficient is 0.98. In contrast, the water collection coefficient of the fairing and other areas of the supporting plate is very small, with a numerical value of about 0. 5%. In addition, for the vertical branch plate parallel to the symmetrical plane of the inlet, there exists a water collection coefficient of 0 shelter in the region intersecting with the casing.
【作者单位】：南京航空航天大学能源与动力学院;
【分类号】：V231

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