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平面液膜破碎及雾化过程的试验研究
芦翔1,靳朝阳2,葛冰1,臧述升1
1.上海交通大学 机械与动力工程学院 动力机械及工程教育部重点实验室,上海 200240;2.中国船舶及海洋工程设计研究院,上海 200011
摘要:
为考察液膜破碎及雾化特性,通过高速相机、平面激光诱导荧光(PLIF)和相位多普勒粒子分析仪(PDPA)对平面液膜的失稳、破碎及雾化全过程进行了试验研究。结果表明,平面液膜在预膜板上的液膜形态与气液速度比(λ)直接相关。随着气液速度比增大,平面液膜分别会呈现平滑表面(λ≤23)、波动表面(23<λ<70)和液膜剥离(λ≥70)三种形态。此外,平面液膜破碎过程中会形成叶瓣状、波纹状、孔状和韧带状的液带,液带形状主要取决于气流和液体速度。液膜破碎过程的破碎距离和横向不稳定波长与韦伯数、动量比以及液相雷诺数有关,液膜破碎后的雾化粒径随着气流速度的增大而减小,与液膜破碎过程的破碎距离和横向不稳定波长呈线性关系。
关键词:  平面液膜  破碎过程  可视化研究  液膜形态  雾化粒径
DOI:10.13675/j.cnki.tjjs.210655
分类号:V231.2+3
基金项目:国家科技重大专项(2017-V-0012-0064)。
Experiment Research on Break-Up and Atomization Process of Planar Prefilm
LU Xiang1, JIN Zhao-yang2, GE Bing1, ZANG Shu-sheng1
1.Key Laboratory of Power Machinery and Engineering,Ministry of Education,School of Mechanical Engineering, Shanghai Jiaotong University,Shanghai 200240,China;2.Marine Design and Research Institute of China,Shanghai 200011,China
Abstract:
High-speed camera, Planar Laser Induced Fluorescence (PLIF) and Phase Doppler Particle Analyzer (PDPA) were used to evaluate the break-up and atomization process of planar prefilm to evaluate the breaking-up and atomization characteristics of liquid prefilm. The result shows, liquid sheet on the prefilm plate can be divided into three shapes decided by air and liquid velocity ratio: smooth film surface (λ≤23), wave film surface (23<λ<70) and film stripping (λ≥70). Prefilm will break up into shapes of lobe, corrugation, hole, and ligament based on the effect of air and liquid velocity. The break-up length and transverse unstable wavelength of the prefilm break-up are dependent on Weber number, momentum ratio and liquid Reynolds number. The droplet size decreases with the increase of air velocity and is in a linear relationship with break-up length and transverse unstable wavelength.
Key words:  Planar prefilm  Break-up process  Visualization investigation  Prefilm shape  Atomization size