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为了改善目前直接将大气液态水含量(LWC0)作为发动机进口结冰计算参数的研究现状,对某S弯进气道的LWC变化进行了数值模拟。采用欧拉-拉格朗日方法计算了进气道内空气-水滴两相流场,得到了流场液态水含量的分布;分析了不同的流量系数下大气液态水含量、水滴直径、Ma对进气道出口LWC的影响。计算结果表明:受S弯的影响,进气道出口的液态水含量分布不均匀,中间液态水含量较高,顶部和底部较少;流量系数φ<1时比φ>1时的出口平均LWC高,且高LWC区域也较大;在流量系数一定的条件下,水滴直径增加,进气道出口平均LWC减小;大气中LWC0增加,进气道出口LWC分布不变,但LWC值会增大;Ma增加,进气道出口平均LWC变化不大。由于进气道出口LWC的数值及分布与大气中的LWC0存在一定差别,因此研究发动机支板的结冰、防冰问题和发动机帽罩的结冰、防冰问题时,需要考虑进气道的影响。
In order to improve the research status of LWC0 which is used to calculate the inlet icing of the engine, the LWC variation of a S-bend inlet is numerically simulated. The Euler-Lagrange method was used to calculate the air-water two-phase flow field in the inlet and the distribution of liquid water content in the flow field was obtained. The liquid water content, droplet diameter, Impact of airway exit LWC. The calculation results show that the liquid water content at the outlet of the inlet is unevenly distributed, the liquid water content in the middle is relatively high and the top and bottom are less affected by the S-bend. The average LWC of the outlet at the flow coefficient φ <1 is greater than 1 High LWC and high LWC area. With the constant flow coefficient, the droplet diameter increases and the average inlet LWC decreases. The atmospheric LWC0 increases and the inlet LWC distribution remains unchanged, but the LWC increases Large; Ma increases, the average inlet port LWC little change. Because the value and distribution of the inlet LWC at inlet are different from the LWC0 in the atmosphere, it is necessary to consider the air intake when considering the icing and anti-icing of the engine plate and the icing and anti-icing of the hood of the engine influences.