Novel ejector model for performance evaluation on both dry and wet vapors ejectors |
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| Authors: | Yinhai Zhu Yanzhong Li |
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| Affiliation: | 1. Institute of Marine Engineering and Thermal Science, Marine Engineering College, Dalian Maritime University, Dalian 116026, China;2. Key Laboratory of Marine, Mechanical & Manufacturing Engineering of the Ministry of Transport, Dalian 116026, China;1. New Energy Center, Department of Mechanical Engineering, National Taiwan University, Taipei 106, Taiwan;2. Odessa State Academy of Refrigeration, Ejector Refrigeration Technology Center, 1/3, Dvoryanskaya St., 65082 Odessa, Ukraine;1. Department of Mechanical and Aerospace Engineering, University of Missouri – Columbia, Columbia, MO 65211, USA;2. Institute of Marine Engineering and Thermal Science, Marine Engineering College, Dalian Maritime University, Dalian 116026, China;1. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China;2. Beijing Key Laboratory of CO Utilization and Reduction Technology, Department of Thermal Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | A novel ejector model is proposed for the performance evaluation on ejectors with both dry and wet vapor working fluids at critical operating mode. A simple linear function is defined in order to approach the real velocity distribution inside the ejector. Mass flow rates of the primary flow and secondary flow are derived by integrating the velocity function at the inlet section of the mixing chamber. By considering the flow characteristics of the critical-mode operating ejector, the developed model contains only one energy conservation equation and is independent of the flow in the mixing chamber and the diffuser. Experimental data from different ejector geometries and various operation conditions reported earlier are used to verify the effectiveness of the new model. Results show that the model has a good performance in predicting the mass flow rates and the entrainment ratio for both dry and wet vapor ejectors. |
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