CIESC Journal ›› 2016, Vol. 67 ›› Issue (S1): 63-68.doi: 10.11949/j.issn.0438-1157.20160561

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Influences of primary nozzle diameter on steam ejector performance

FU Weina, LIU Zhongliang, LI Yanxia, WU Hongqiang, TANG Yongzhi   

  1. Key Laboratory of Enhanced Heat Transfer and Energy Conversion, Ministry of Education, Key Laboratory of Heat Transfer and Energy Conversion, Beijing Education Commission, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China
  • Received:2016-04-27 Revised:2016-05-03 Online:2016-08-31 Published:2016-08-31
  • Supported by:

    supported by the Beijing Municipal Science & Technology Plan Project (Z111100058911006).


The complex internal flow field of steam ejector was numerically simulated with commercial software FLUENT. The pressure and velocity variation of internal fluid in the flowing process were studied and analyzed. The influences of the mixing steam pressure and the outlet diameter of primary nozzle on the ejector performance of the steam ejector were discussed in a great length. It is found from the results that the entrainment ratio of the steam ejector remains constant first with the back pressure to its critical pressure and then decreases, nevertheless, the entrainment ratio initially increases sharply with the primary nozzle outlet diameter and then decreases after the outlet diameter exceeds a certain value. Therefore there exists a critical outlet pressure for the steam ejector that determines its operation states. The outlet diameter of main nozzle has an optimal range, in which the ejector obtains the best performance, and the dissipation loss of the shock wave is relatively small.

Key words: steam ejector, mixed steam pressure, primary nozzle outlet diameter, entrainment performance, shock wave, process systems, model, numerical simulation

CLC Number: 

  • TK124
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