Structural design and numerical analysis of two-stage low-pressure ejector

被引：0

作者：

Ni Y. ^{[1
]}

Zhao Q. ^{[1
]}

Gui Y. ^{[1
]}

Wang Y. ^{[1
]}

Shao H. ^{[1
]}

机构：

[1] Department of Thermal Engineering, School of Energy and Power Engineering, Xi'an Jiaotong University, Shaanxi, Xi’an

来源：

Huagong Jinzhan/Chemical Industry and Engineering Progress | 2020年 / 39卷 / S1期

关键词：

mixing; numerical analysis; optimization; structural design; two-stage ejector;

D O I：

10.16085/j.issn.1000-6613.2020-0213

中图分类号：

学科分类号：

摘要：

The ejector is an important part of the current atmospheric burner, and it undertakes the key task of ejecting and mixing two or more media with each other. This paper first designed and optimized the structure of the two-stage ejector for the gas burner, and carried out two-dimensional, steady-state numerical simulations of the two designed two-stage ejectors. The mixing process of momentum and mass exchange of gas and air uses the mass ejection coefficient and the standard deviation coefficient of the outlet methane mass fraction to characterize the ejection performance and mixing performance of the ejector. The structure parameters and operating parameters of the ejector are studied. Studies have shown that two types of two-stage ejectors can eject air that exceeds the stoichiometric ratio. There is an optimal value for the length of the first-stage mixing section to maximize the mass flow rate ejecting coefficient of the ejector. When the other parameters of the ejector are the same, the optimized two-stage ejector's ejection performance is improved under different back pressure, and the mixing performance is reduced under different back pressures. The higher the back pressure, the greater the improvement in ejection performance, and the smaller the decrease in mixing performance. © 2020, Chemical Industry Press Co., Ltd.. All rights reserved.

引用

页码：69 / 76

页数：7

共 19 条

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