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横流中喷雾掺混流场结构研究

ISSN号：1001-4055
期刊名称：推进技术
时间：2012
页码：221-226
分类：V233.59[航空宇航科学与技术—航空宇航推进理论与工程;航空宇航科学技术]
作者机构：[1]西安交通大学动力工程多相流国家重点实验室,陕西西安710049
相关基金：国家自然科学基金创新群体项目（50821064）.
相关项目：能源高效节约和可再生转化利用的多相流理论基础

关键词：横流, 喷雾, 掺混流场, 反旋涡对, Crossflow, Spray droplets, Mixing flow field, Counter-rotating vortex pair

中文摘要：

为了获得有限空间内喷雾在横流影响下的掺混发展及机理,应用PIV系统测量了单个旋流雾化喷嘴产生的喷雾在横流中的掺混流场,实验在矩形通道内实施。获得了3种喷嘴入射角度和3种液气动量比下的掺混截面流场结构。结果表明,由于射流撞击、剪切和壁面约束作用,流场中形成前缘涡和反旋涡对,反旋涡对对掺混起了主要作用。比较不同喷嘴入射角度和液气动量比下的流场结构发现,随喷雾入射角度减小,两相作用提前发生,且反旋涡对尺度小,更利于掺混均匀;随液气动量比减小,气相作用增强,旋涡强度和尺度变小,更小的涡尺度更利于液滴均匀分布。

英文摘要：

In order to understand the evolution and mechanism of the mixing of spray droplets in crossflow in confined space, the mixing flow fields of water spray in air crossflow were measured in a rectangular duct by using a particle image ve- locimetry （PIV） system. The spray was generated by a pressure swirl nozzle. The velocity vector structures at different cross sections were obtained under the work conditions of three nozzle injection angles and three liquid/gas momentum flux ratios. The results show that the leading vortex pair appears due to the first impingement of the erossflow and the spray. The counter - rotating vortex pairs （CVPs） are observed during the mixing process. The CVP forms due to the shear of spray and the re- straint of wall and plays an important role in influencing the mixing uniformity. It is also found that the inclined nozzle with an injection angle against the upstream crossflow allows the CVP to occur early and the CVP maintains a small size. A smaller liq- uid/gas momentum flux ratio also contributes to a small-scale CVP. Both the two mechanisms help to enhance the mixing uniformity.