期刊
ENTROPY
卷 24, 期 7, 页码 -出版社
MDPI
DOI: 10.3390/e24070960
关键词
ejector; non-equilibrium condensation; superheat steam; computational fluid dynamics
资金
- Natural Science Foundation of Shandong Province [ZR2021QE172]
- Major Scientific and Technological Innovation Projects of Shandong Province [2019JZZY010805]
- National Key R&D Program of China [2019YFB1504700]
- National Natural Science Foundation of China [61973195]
This study investigates the impact of steam superheat on ejector performance and non-equilibrium condensation phenomena using a wet steam model. The simulations demonstrate that increasing primary flow superheat enhances the entrainment ratio, while increasing secondary flow superheat decreases the entrainment ratio. The non-equilibrium condensation starting position shifts backwards and the mass fraction of condensed droplets decreases as primary flow superheat increases.
In this study, a wet steam model was used to investigate the effect of steam superheat on ejector performance and non-equilibrium condensation phenomena. The simulation data for the ejector were validated with experimental data. The simulations show that an increase in primary flow superheat will increase the entrainment ratio, while an increase in secondary flow superheat will decrease the entrainment ratio. The output fluid superheat has little effect on the entrainment ratio. As the primary flow superheat increases from 0 to 20 K, the starting position of non-equilibrium condensation moves backward by 5 mm, and the mass fraction of condensed droplets decreases by 20%. The higher the secondary flow superheat, the lower the mass fraction of liquid in the diffusion chamber. The superheat level of the output fluid has no influence on the non-equilibrium condensation phenomenon of the ejector.
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