液-液射流雾化的数值模拟与实验研究  

Numerical Simulation and Experimental Study of Liquid-liquid Jet-flow Atomization

作　　者：彭正标[1] 梁坤峰[1] 袁竹林[1] 

机构地区：[1]东南大学能源与环境学院,江苏南京210096

出　　处：《热能动力工程》2007年第2期205-212,共8页Journal of Engineering for Thermal Energy and Power

基　　金：国家重点基础研究发展计划(973)基金资助项目(2004CB217707)

摘　　要：建立了液-液雾化机理的数值模拟平台与实验研究平台,对水在非相溶溶液中的喷射雾化机理进行了研究。应用VOF-CSF多相流模型对雾化过程进行了数值模拟,并在相同工况下进行了实验验证和对比。研究表明,所建立的数学模型能成功地模拟连续射流雾化过程,与实验结果取得了非常好的一致性。通过数值模拟和实验相结合的方法,对雾化过程中的射锥高度、射流速度、非相溶介质流速等关键因素的影响进行了探讨,获得了相应的规律:在确定的雾化条件下,雾化液滴粒径呈现出离散性;液滴的运动方式随射流速度的增加由规则逐渐过渡为紊乱;射流速度为3.5 m/s与非相溶介质流速为0.18 m/s时,雾化射锥高度变化趋势发生转变。本文的研究结果对认识液-液射流雾化机理以及相应的工程应用,具有重要的指导意义和实用价值。A platform for numerical simulation of liquid-liquid atomization mechanism and another one for experimental study have been established.By employing the above platforms,water jet atomization mechanism in indissolvable solutions has been studied and its atomization process numerically simulated by using a VOF-CSF multi-phase flow model.An experimental verification and comparison was performed under identical working conditions.The study shows that the mathematical model set up by the authors can successfully simulate a continuous jet-flow atomization process and the simulation results are in extremely good agreement with the experimental ones.Through a combination of numerical simulation and experiments an exploratory study has been conducted of the influence of such key factors as jet-flow cone height,jet flow speed,indissolvable working-medium velocity etc.As a result,the following relevant law has been identified: under a certain atomization condition,the particle diameters of the atomization liquid droplets appear to be discrete;with an increase in jet flow velocity,the movement mode of liquid droplets assumes a gradual transition from being regular in shape to becoming turbulent.When the jet flow velocity is 3.5 m/s and the indissolvable medium velocity 0.18 m/s,the development trend of the atomization jet-flow cone height will undergo a change.The research findings are of major significance and have practical value for understanding liquid-liquid jet-flow atomization mechanism and better guiding relevant engineering applications.

关 键 词：液-液雾化 数值模拟 实验研究 VOF—CSF多相流模型 

分 类 号：O359[理学—流体力学]