摘要
基于DPM离散模型、液滴破碎模型和液滴与气体之间的传热传质模型,对闪蒸室内液滴雾化闪蒸进行仿真模拟。喷雾发展初期闪蒸最为剧烈,各物理场如液滴的温度场、速度场、气体的压力场及温度场等均在极短时间内大幅度变化,随着时间推进,闪蒸反应蒸发强度明显减弱,各物理场的数值变化缓慢。研究不同叶片数量和角度对不平衡分数(NEF)、不平衡温差(NETD)及闪蒸效率等进行分析。结果表明:随着叶片数量的增加,水滴的NEF和NETD均减小,闪蒸效率增大;液滴的NEF和NETD随着叶片角度的增大先增大后减小,闪蒸效率则相反,该工况下叶片角度为35°最为适宜。
Based on DPM discrete model,droplet breakage model and the heat and mass transfer model between the droplets and the gas,the simulation of droplet atomization flash in flash chamber was carried out.At the beginning of the development of the spray,the flashing is the most intense.The temperature field,velocity field,gas pressure field and temperature field of each physics field change greatly in a very short time.With the advancement of time,the evaporation intensity of the flash reaction decreases obviously and the value of each physics field changes slowly.Study on the effect of both number and angle of different blades on the imbalance scores,unbalanced temperatures difference and flashing efficiency showed that,with the increase of the number of blades,the NEF and NETD of the droplet decrease and the flashing efficiency becomes increased;the NEF and NETD of the droplet increase first and then decrease with the increase of the blade angle,but the flashing efficiency is opposite.The blade angle with a 35°angle is the most suitable under this condition.
作者
陈启东
顾泽堃
张斌
CHEN Qi-dong;GU Ze-kun;ZHANG Bin(School of Mechanical Engineering,Changshu Institute of Technology;School of Mechatronics Engineering,Soochow University)
出处
《化工机械》
CAS
2020年第2期240-244,265,共6页
Chemical Engineering & Machinery
基金
国家自然科学基金项目(51705037)。
关键词
喷雾闪蒸
旋流叶片
高温高压
传热传质
闪蒸特性
spray flashing
swirling blade
high temperature and pressure
heat and mass transfer
flashing characteristics
