异戊烷闪蒸喷雾喷嘴近场雾化与喷嘴内流动特性  

Atomization Near Nozzle Filed and Internal Flow within the Nozzle of iso-Pentane Flashing Spray

作　　者：刘兵 宇文璋杰 杨涛[2] 朱栋清 王嘉丰 周致富[2] LIU Bing;YUWEN Zhangjie;YANG Tao;ZHU Dongqing;WANG Jiafeng;ZHOU Zhifu(Xi’an Research Institute of Aerospace Power Measurement and Control Technology,Xi’an Shaanxi 710049;State Key Laboratory of Multiphase Flow in Power Engineering,Xi’an Jiaotong University,Xi’an Shaanxi 710049)

机构地区：[1]中国航天科技集团有限公司四院401所,陕西西安710025 [2]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

出　　处：《东北电力大学学报》2022年第3期57-63,共7页Journal of Northeast Electric Power University

基　　金：国家自然科学基金(52176163)。

摘　　要：当高压液态碳氢燃料由于容器或者管道破口泄露释放到低压环境中,会形成剧烈闪蒸喷雾,闪蒸喷雾是在动力学与非平衡热力学共同作用下一种复杂的破碎雾化形式.文中搭建了易燃易爆介质闪蒸喷雾实验台,研究了不同初始压力和温度作用下异戊烷闪蒸喷雾喷嘴内流动与近场雾化变化规律.研究结果表明,完全闪蒸雾化前,提高喷雾初温可以极大促进闪蒸雾化程度,之后温度变化对闪蒸雾化的影响急剧减弱;相同过热度下,提高喷雾初始压力也增加了闪蒸喷雾锥角和喷雾影响区域.在闪蒸喷雾不稳定阶段,喷嘴内出现多种两相流型并伴随不同闪蒸雾化形态,喷嘴内气相含率与闪蒸喷雾剧烈程度呈现正相关性,但是二者之间存在一定相位差,相位差与喷嘴内汽化起始点距离喷嘴出口距离以及流动速度有关.The accidental release of flammable hydrocarbon liquid with high pressure into low-pressure environment will cause an explosive flashing spray, due to the failure of a vessel or pipe in the form of a small hole.Flashing spray is a complex physical phenomenon governed by the hydrodynamics and thermodynamics.This paper conducted an experimental study on the effect of spray initial pressure and temperature on the internal flow within the nozzle and near-nozzle field atomization of iso-pentane flashing spray.The experimental results indicated that the first increase in spray temperature enhanced atomization quality significantly before the spray reaching the fully flashing.Afterwards, spray temperature had much less effect on the atomization pattern.Increasing spray pressure also promoted the flashing spray, leading to a larger spray angle and influencing region under the same spray temperature.During the transient period of flashing spray, various two-phase flow patterns could be observed within the straight tube nozzle.The gas phase fraction within the nozzle is positively correlated with the intensity of flashing spray outside the nozzle, but there is a certain phase difference between them.The phase difference is determined by the distance between the start point of cavitation in the nozzle and the exit of the nozzle and the flow velocity within the nozzle.

关 键 词：泄漏性事故 闪蒸喷雾 过热度 近场雾化形态 喷嘴内流动 

分 类 号：TM62[电气工程—电力系统及自动化] TE88[石油与天然气工程—油气储运工程]