不同膨胀状态下涡旋膨胀机非定常流动特性分析

doi:10.12028/j.issn.2095-4239.2019.0119

储能科学与技术 ›› 2019, Vol. 8 ›› Issue (6): 1241-1246.doi: 10.12028/j.issn.2095-4239.2019.0119

不同膨胀状态下涡旋膨胀机非定常流动特性分析

刘祯^1,2, 吴华伟^1,2, 林鑫^1,3, 宋盼盼⁴

1 湖北文理学院纯电动汽车动力系统设计与测试湖北省重点实验室, 湖北襄阳 441053;
2 湖北文理学院汽车与交通工程学院, 湖北襄阳 441053;
3 武汉科技大学汽车与交通工程学院, 湖北武汉 430081;
4 北京理工大学机械与车辆学院, 北京 100081

收稿日期:2019-05-08 修回日期:2019-07-28 出版日期:2019-11-01 发布日期:2019-11-01
通讯作者: 吴华伟,副教授,研究方向为机电系统设计、故障诊断与健康管理,E-mail:whw_xy@163.com。
作者简介:刘祯(1984-),女,博士,讲师,研究方向为热能转换及利用、容积式机械数值计算及优化设计,E-mail:liuzhen@hbuas.edu.cn
基金资助:
北京市自然科学基金资助项目（3194057），湖北省技术创新专项重大项目（2017AAA133），“机电汽车”湖北省优势特色学科群开放基金（XKQ2019010，XKQ2019016）。

Unsteady flows of a scroll expander under various types of expansion process

LIU Zhen^1,2, WU Huawei^1,2, LIN Xin^1,3, SONG Panpan⁴

1 Hubei Key Laboratory of Power System Design and Test for Electrical Vehicle, Hubei University of Arts and Science, Xiangyang 441053, Hubei, China;
2 School of Automotive and Traffic Engineering, Hubei University of Arts and Science, Xiangyang 441053, Hubei, China;
3 School of Automobile and Traffic engineering, Wuhan University of Science and Technology, Wuhan 430081, Hubei, China;
4 School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China

Received:2019-05-08 Revised:2019-07-28 Online:2019-11-01 Published:2019-11-01

摘要/Abstract

摘要： 本工作采用计算流体力学（CFD）的方法对适应于微型压缩空气储能（micro-CAES）系统的涡旋膨胀机工作过程进行非定常数值模拟，得到膨胀机内部压力场、速度场和温度场的分布，研究了相同排气背压下外膨胀比对涡旋膨胀机非稳态性能的影响规律及工作腔流场结构分布，结果显示：排气背压一定时，外膨胀比的变化对进气质量流量的脉动规律影响较小，外膨胀比的增加，增大了出口质量流量脉动程度、增大了膨胀机内压缩空气的热量利用程度、增大了膨胀机非稳态驱动力矩、增大了背压腔内二次流旋涡的强度和尺度，背压腔中存在明显局部高温区。

关键词: 微型压缩空气储能, 涡旋膨胀机, 非定常流动, 外膨胀比, 数值模拟

Abstract: This study was expected to provide the theory references for the design of a scroll expander used in micro-compressed air energy storage (micro-CAES) systems, by conducting the computational fluid dynamics (CFD) method to obtain the pressure, velocity and temperature field distributions in the working chambers. The effects of different external expansion ratio on the transient performance of the scroll expander and the flow fields of the working chambers were investigated under a constant back-pressure. The results showed that the variable external expansion ratio has little influence on the fluctuation of the inlet mass flow rate, and the outlet mass flow rate fluctuation increases with the increase of the external expansion ratio. The heat utilization degree of the compressed air in the expander and the unsteady driving moment of the expander increase with the increase of the external expansion ratio. The secondary flow loses in the back pressure chamber also increase with the increase of the external expansion ratio. There exist obvious local high temperature areas in the back pressure chamber.

Key words: micro-CAES, scroll expander, unsteady flow, external expansion ratio, numerical simulation

中图分类号:

TH45

刘祯, 吴华伟, 林鑫, 宋盼盼. 不同膨胀状态下涡旋膨胀机非定常流动特性分析[J]. 储能科学与技术, 2019, 8(6): 1241-1246.

LIU Zhen, WU Huawei, LIN Xin, SONG Panpan. Unsteady flows of a scroll expander under various types of expansion process[J]. Energy Storage Science and Technology, 2019, 8(6): 1241-1246.

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不同膨胀状态下涡旋膨胀机非定常流动特性分析

Unsteady flows of a scroll expander under various types of expansion process

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