| 内部不可逆损失对喷射器性能影响理论分析 |
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| 引用本文： | 戴征舒,陈光明,张华. 内部不可逆损失对喷射器性能影响理论分析[J]. 化工学报, 2016, 67(Z2): 78-86. DOI: 10.11949/j.issn.0438-1157.20161379 |
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| 作者姓名： | 戴征舒 陈光明 张华 |
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| 作者单位： | 1. 上海理工大学能源与动力工程学院, 上海 200093;2. 浙江大学制冷与低温研究所, 浙江 杭州 310027 |
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| 基金项目： | 国家重点基础研究发展计划项目（2010CB227304）；国家自然科学基金重大资助项目（50890184）；上海高校青年教师培养资助计划项目（10-16-301-801）。 |
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| 摘 要： | 喷射器作为喷射式制冷系统的关键部件，其性能对系统性能有着重要影响。建立了采用实际气体性质且考虑喷射器内两相存在的喷射器性能预测模型，并定义了喷射器内部各部分不可逆损失，利用理论模型对喷射器内部各部分不可逆损失程度对喷射器性能的影响进行理论分析，讨论了喷射器内部各部分不可逆损失程度对喷射系数、喷射器效率和喷射器出口背压的影响。结果表明，工作流体在喷嘴中的不可逆损失以及引射流体在吸入室的不可逆损失对喷射系数影响较大，扩散段不可逆损失和混合段不可逆损失对喷射系数几乎没有影响；随着喷射器内部各部分不可逆损失的减小，喷射器效率增大，同时可以使喷射器出口背压提高。
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| 关 键 词： | 喷射器性能 不可逆损失 实际气体 效率系数 |
| 收稿时间： | 2016-09-29 |
| 修稿时间： | 2016-10-09 |
Theoretical analysis on impact of irreversibility on ejector performance |
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| DAI Zhengshu,CHEN Guangming,ZHANG Hua. Theoretical analysis on impact of irreversibility on ejector performance[J]. Journal of Chemical Industry and Engineering(China), 2016, 67(Z2): 78-86. DOI: 10.11949/j.issn.0438-1157.20161379 |
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| Authors: | DAI Zhengshu CHEN Guangming ZHANG Hua |
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| Affiliation: | 1. School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;2. Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou 310027, Zhejiang, China |
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| Abstract: | Ejector is the key component of ejector refrigeration system.Its performance is directly of relevance to the system efficiency.In the present work, a new theoretical model is proposed to analyze the impact of internal irreversibility of the ejector on its performance, including entrainment ratio, ejector efficiency and ejector back pressure.In the proposed model, real gas characteristic is used, and the existence of two phases is also considered for the prediction of ejector performance.Results show that the irreversibility of primary flow through the converging-diverging nozzle and the irreversibility of secondary flow expansion in suction chamber have great impact on entrainment ratio, the irreversibility of mixed flow in mixing chamber and diffuser almost has little influence on the entrainment ratio.And with the decrease of the internal irreversibility in each part of the ejector, ejector efficiency increases and the ejector back pressure increases as well. |
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| Keywords: | ejector performance irreversibility real gas efficiency coefficient |
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