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中文摘要：
高温高压条件下受限空间内旋流喷雾与横向气流的掺混规律尚不清楚,本文对圆形通道内高温燃气与旋流喷雾掺混蒸发过程进行了三维数值模拟,探究流场特征与掺混规律,研究增强流场掺混效果的方法。研究结果表明,四喷嘴周向均匀布置可以使雾化液滴群较均匀的充满掺混空间。相邻喷嘴中间区域液滴群浓度较高,气相温降较大。靠近壁面区域出现多组小尺度的旋涡对结构,小尺度涡结构的发展是促进掺混蒸发过程的主要方式。喷嘴雾化锥角、轴向倾角、切向倾角影响雾化液滴滞留时间及喷雾轴向贯穿深度,进而对掺混效果有较大影响,选择适中的喷嘴雾化角及入射角有利于流场掺混均匀。
英文摘要：
In a confined space with high pressure and temperature,the mixing characteristics of pressure-swirl spray in the crossfiow are unclear.In this work,the mixing process of pressure-swirl spray in the overheated gas crossfiow in a pipe was studied numerically.In order to put forward proper method to enhance mixing efficiency,flow behaviors and mixing regularities were investigated here.The results show that spray droplets swarm can fill up the mixing space uniformly with four nozzles equally distributed on circumference.At the central regions between each two adjacent nozzles,the concentration of droplets swarm is high and the temperature is low.Near the pipe wall,pairs of vortices with small scale occur.The evolution of vortices with small scale is the main way to improve droplets evaporation and uniform mixing.Spray angles,axial injection angles and tangential injection angles of nozzles have significant influences on the droplets residence time and depth of penetration.Hence,those angles play important roles on the mixing efficiency.A favorable mixing can be achieved with appropriate spray angle,axial injection angle and tangential injection angle of spray nozzles.
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