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基于回流区特性的气雾化喷嘴设计及流场结构模拟 预览

Design of Atomizing Nozzle and Simulation of its Flow Field Structure
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摘要 本文设计了一种laval喷管结构雾化器,并利用CFD软件模拟研究了雾化气压P、雾化气体温度T、气体喷口孔心距D、气体喷射角度α以及导流管伸出长度d五大因素对流场结构的影响。结果表明:laval喷管雾化流场结构与狭缝喷嘴不同,气流喷出后不发生膨胀,不形成闭涡结构;随着P的增大,流场速度增加,区域扩大,回流区静态压力Ps不随P变化而变化;增加气体温度T可以提升流场速度和流场温度;气体喷口孔心距D会影响回流区压力和流场速度;增大气体喷射角度α可以提升流场速度,同时会导致回流区压力升高;随着导流管伸出长度d的增加,回流区静压先下降后升高。 In this paper,an atomizer with laval nozzle is designed and studied by commercial CFD software.The influence of the five main factors(the atomization pressure P,the gas temperature T,the gas nozzle distance D,the gas injection angleαand the protrusion of delivery tube h)on the flow field structure is investigated.The result shows that the flow field structure of the laval nozzle is different from the annular nozzle without dramatic gas expansion and recirculation flow formed at the nozzle exit.The flow field velocity increases with atomization pressure,however,the static pressure(Ps)in recirculation zone remains unchanged.Along with the increase of gas temperature,the velocity and temperature in the flow field also increase.The gas nozzle distance affects the flow field velocity and Ps significantly.On the other hand,The flow field velocity and Ps increase with the gas injection angle.With the increasing of the conduct tube extension,the Ps declines before it rises.
作者 徐良辉 周香林 李景昊 杜开平 马尧 于月光 Lianghui Xu;Xianglin Zhou;Jinghao Li;Kaiping Du;Yao Ma;Yueguang Yu(State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083;Department of Mechanical Engineering,Mcgill University,Montreal,QCH2A0C3,Canada;BGRIMM Technology Group,Beijing 100160)
出处 《热喷涂技术》 2019年第3期30-37,共8页 Thermal Spray Technology
基金 国家重点研发计划(2017YFB0306102) 国家自然科学基金项目(51271034)。
关键词 laval喷管 CFD 回流区 流场结构 抽吸压力 Laval nozzle CFD Recirculation zone Flow field Aspiration pressure
作者简介 第一作者:徐良辉(1993-),男,硕士研究生,xulianghui2017@qq.com;通讯作者:周香林,bkdzxl@ustb.edu.cn。
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