两相流CO2喷射器内部流场的数值模型

doi:10.16183/j.cnki.jsjtu.2019.07.013

上海交通大学学报 ›› 2019, Vol. 53 ›› Issue (7): 860-865.doi: 10.16183/j.cnki.jsjtu.2019.07.013

两相流CO2喷射器内部流场的数值模型

王雨风1，王丹东1，胡记超1，陈亮1，陈江平1,2

1. 上海交通大学制冷与低温工程研究所，上海 200240; 2. 上海市高效冷却系统工程技术中心，上海 200240

出版日期:2019-07-28 发布日期:2019-08-02
通讯作者: 陈江平，男，教授，博士生导师，电话(Tel.)： 021-34206775； E-mail：jpchen_sjtu@163.com.
作者简介:王雨风（1995-），男，江苏省徐州市人，硕士生，主要研究方向为喷射器数值模拟及可视化.
基金资助:
国家自然科学基金项目(51776119)

A Numerical Model of the Two-Phase CO2 Ejectors

WANG Yufeng 1,WANG Dandong 1,HU Jichao 1,CHEN Liang 1,CHEN Jiangping 1,2

1. Institute of Refrigeration and Cryogenics, Shanghai Jiao Tong University, Shanghai 200240, China; 2. Shanghai High Efficiency Cooling System Research Center, Shanghai 200240, China

Online:2019-07-28 Published:2019-08-02

摘要/Abstract

摘要： 利用计算流体动力学模拟软件Fluent建立两相流CO2喷射器非均相模型，基于非均相模型对CO2喷射器的内部流场进行数值模拟，分析喷射器内部流场的相变、压力和速度变化情况，通过实验验证了模型精度；通过改变喷嘴段结构参数，探究了喷嘴设计对于喷射器性能的影响，并对喷射器结构进行优化.结果表明：喷射器喷射流量以及引射压力的模拟值与实测值的误差分别为 6.5% 和 5.0%，即所建模型具有较高的精度；当喷射器喷嘴段出口出现激波现象时，流体的压力和速度均出现波动，并且存在明显的边界层；喷嘴发散段的长度越长，喷射流量越小，喷射速度越高；通过优化喷嘴段结构参数，可使喷射器的效率提高 10.5%.

关键词: 喷射器；结构优化；二氧化碳；两相流；流场特性

Abstract: A CFD-based numerical analysis of a two-phase R744 ejector using heterogeneous mixture model is presented in this work. The flow patterns inside the ejector, such as the mass transfer rate, change of pressure and velocity alongside the ejector are analyzed. Based on the experimental work, the numerical model is validated. The effect of the ejector’s nozzle geometry on the ejector performance is discussed, and an optimization of the nozzle geometry is performed. Based on the experimental data, the numerical model predicts the motive mass flow rate and the suction pressure within an error margin of 6.5%. Shock wave phenomenon can be observed around the nozzle exit. The motive mass flow rate of the ejector decreases and the motive velocity increases with the increasing divergent length. The optimization of the nozzle geometry can increase the ejector efficiency by 10.5%.

Key words: ejector; structure optimization; carbon dioxide; two-phase flow; flow field characteristic

中图分类号:

TB 61

王雨风，王丹东，胡记超，陈亮，陈江平. 两相流CO2喷射器内部流场的数值模型[J]. 上海交通大学学报, 2019, 53(7): 860-865.

WANG Yufeng,WANG Dandong,HU Jichao,CHEN Liang,CHEN Jiangping. A Numerical Model of the Two-Phase CO2 Ejectors[J]. Journal of Shanghai Jiaotong University, 2019, 53(7): 860-865.

参考文献

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两相流CO2喷射器内部流场的数值模型

A Numerical Model of the Two-Phase CO2 Ejectors

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