| 三角转子膨胀机在跨临界CO2制冷循环中的应用分析 |
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| 引用本文： | 李沛昀,李杨,王文彬,王文.三角转子膨胀机在跨临界CO2制冷循环中的应用分析[J].化工学报,2021,72(Z1):161-169. |
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| 作者姓名： | 李沛昀 李杨 王文彬 王文 |
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| 作者单位： | 1.上海交通大学机械与动力工程学院，上海 200240;2.上海宇航系统工程研究所，上海 201109 |
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| 摘 要： | 在高压比跨临界CO2制冷循环中，采用膨胀机替代节流元件对提高循环效率有较大的潜力。分析了以三角转子机械作为膨胀机的运行机理，对三角转子膨胀机的工作过程进行计算和分析，并从形状因子、转子型线、进气角度、偏心距和轴距系数入手，讨论了影响三角转子膨胀机的影响因素。在设定情况下，使用三角转子膨胀机可以通过将10 MPa、313.15 K的超临界CO2膨胀至3.49 MPa、273.69 K，并将制冷系数提高23.7%。形状因子和进气角度是影响膨胀机运行效果的主要因素，需选取适当的参数来提高效率。
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| 关 键 词： | 跨临界CO2 制冷循环 膨胀机 三角转子 |
| 收稿时间： | 2020-11-03 |
Application analysis of Wankel expander in CO2 trans-critical refrigeration cycle |
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| LI Peiyun,LI Yang,WANG Wenbin,WANG Wen.Application analysis of Wankel expander in CO2 trans-critical refrigeration cycle[J].Journal of Chemical Industry and Engineering(China),2021,72(Z1):161-169. |
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| Authors: | LI Peiyun LI Yang WANG Wenbin WANG Wen |
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| Affiliation: | 1.School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2.Aerospace System Engineering Shanghai, Shanghai 201109, China |
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| Abstract: | Utilizing expander instead of throttle valve in high pressure ratio CO2 trans-critical refrigeration cycle has great potential to improve cycle efficiency. Compared with other expanders, the Wankel expander has a series of advantages in terms of compactness, economy and reduced mechanical vibrations, the working process consists of intake process, expand process and exhaust process. In this paper, the operation mechanism of Wankel expander in the refrigeration system is theoretically analyzed, including the working process, the influence of shape factor, rotor profile, intake angle, eccentric distance and wheelbase coefficient. A non-isentropic model which introduces isentropic efficiency is used to calculate the physical properties of cavity according to the change of volume. In this paper, by expanding supercritical CO2 from 10 MPa, 313.15 K to 3.485 MPa, 273.69 K, the Wankel expander can increase the refrigeration coefficient by 23.7% in the discussed conditions; the shape factor and the intake angle are the main factors that affect the performance of Wankel expander. It is necessary to select appropriate parameters in order to optimize the efficiency. |
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| Keywords: | trans-critical CO2 refrigeration cycle expander Wankel engine |
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