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为了研究收缩段型面和液滴轨迹特性对结冰风洞流场品质与结冰试验效果的重要影响,获得收缩段的优化设计参数,采用数值模拟方法,使用二维简化模型对3m×2m结冰风洞收缩段的流场特性进行了研究,对几种典型收缩曲线的流场进行了计算,对比了收缩曲线对沿轴向压力分布、出口截面速度分布、不同粒径云雾粒子的极限释放距离及试验段入口云雾粒子分布的影响,结果表明:三次曲线与xm为0.4的五次曲线不能满足流场合格指标,其他曲线流场特性差别不大,维氏曲线具有最小极限释放距离,在收缩段出口,三次曲线和五次曲线粒子包络面积最大,综合比较,xm为0.5的五次曲线能有效兼顾流场均匀性、极限释放距离和收缩段出口粒子包络面积比.
In order to study the important influence of shrinkage profile and droplet trajectory on the flow field quality and icing test results of icing wind tunnel, the optimal design parameters of shrinkage section were obtained. By using the numerical simulation method and the two-dimensional simplified model, the optimal design parameters of 3m × 2m The flow fields in the contraction section of the icing wind tunnel were studied. The flow field of several typical shrinkage curves were calculated. The effects of the shrinkage curve on the axial pressure distribution, exit section velocity distribution, The results show that the cubic curve and the cubic curve with xm of 0.4 can not meet the eligibility criteria of flow field. The flow characteristics of other curves have little difference, and the Vickers curve has the minimum limit release distance. At the exit of the contraction section, the cubic envelope and the fifth curve have the largest envelope area, and the fifth curve with xm of 0.5 can effectively balance the uniformity of the flow field, the limit release distance and the particle envelope area ratio at the exit of the contraction section.