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为研究超声速气流中液体横向射流的雾化过程,根据可压缩条件下线性稳定性分析解推导出的不稳定增长率和波数间的色散关系,对KH/RT模型进行了改进,并调整了离散相液滴的追踪算法,利用改进的KH/RT模型对1.94Ma气流条件下水横向射流过程进行模拟。研究表明,数值模拟中液滴的实际追踪数对计算结果有较大影响,而改进的液滴追踪算法有效增加了液滴数,提高了计算准确性;改进的KH/RT模型扩大了Weber数的适用上限至4000,可用于超声速流场;利用改进的KH/RT破碎模型得到的液雾穿透深度与试验测量结果基本一致,而液雾展向和近壁区的分布与试验有一定差异。
In order to study the atomization process of liquid transverse jet in supersonic gas flow, the KH / RT model is improved and the dispersion is adjusted according to the unstable growth rate and dispersion relation between wave numbers under the linear stability analysis of compressible condition. Phase droplet tracking algorithm, the use of improved KH / RT model of 1.94Ma water jet lateral jet process simulation. The results show that the actual tracking number of the droplets in the numerical simulation has a great influence on the calculation results, and the improved droplet tracking algorithm effectively increases the number of droplets and improves the calculation accuracy. The improved KH / RT model expands the Weber number Of the upper limit of application to 4000, can be used for the supersonic flow field; using improved KH / RT broken model obtained penetration depth of the liquid fog and the test results are basically the same, and the distribution of liquid spray near the wall and the zone has a certain difference .