Design and Performance Investigation of Supercritical Carbon Dioxide Ejector

Feng Mengjiao; Liu Minyun; Huang Shanfang; Huang YanPing

doi:10.13832/j.jnpe.2023.S1.0081

Volume 44 Issue S1

Jun. 2023

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Feng Mengjiao, Liu Minyun, Huang Shanfang, Huang YanPing. Design and Performance Investigation of Supercritical Carbon Dioxide Ejector[J]. Nuclear Power Engineering, 2023, 44(S1): 81-87. doi: 10.13832/j.jnpe.2023.S1.0081

Citation:

Feng Mengjiao, Liu Minyun, Huang Shanfang, Huang YanPing. Design and Performance Investigation of Supercritical Carbon Dioxide Ejector[J]. Nuclear Power Engineering, 2023, 44(S1): 81-87. doi: 10.13832/j.jnpe.2023.S1.0081

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Design and Performance Investigation of Supercritical Carbon Dioxide Ejector

doi: 10.13832/j.jnpe.2023.S1.0081

1.
Science and Technology on Reactor System Design Technology Laboratory, Nuclear Power Institute of China, Chengdu, 610213, China
2.
Department of Engineering Physics, Tsinghua University, Beijing, 100084, China
3.
CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology, Nuclear Power Institute of China, Chengdu, 610213, China

Received Date: 2023-03-01
Rev Recd Date: 2023-05-06
Publish Date: 2023-06-15

Abstract

Abstract

In order to minimize the negative impact of leakage gas produced on the stability of the supercritical carbon dioxide cycle without additional mechanical work consumption, an ejector that can pressurize and transport the leakage gas back to the cycle was designed in this paper based on the constant pressure mixing theory and the double choked critical state. The computational fluid dynamics software Fluent was used to simulate the model numerically, analyze the performance of the ejector, and investigate the effect of size parameters on the performance. The results show that the four-stage ejector can sequentially pressurize the 0.5 MPa leakage gas to 2.0, 4.4, 6.0 and 8.0 MPa, realizing the recovery and utilization of the leaked gas. The entrainment ratio is not affected by the back pressure when the back pressure is less than the critical pressure. The entrainment ratio decreases sharply with the increase of the back pressure when the back pressure is greater than the critical pressure. The entrainment ratio increases with the diminution of the inlet area. The entrainment ratio increases first and then decreases with the increase of the contraction angle of the nozzle, and reaches maximum while the contraction angle is 20°.
- Supercritical carbon dioxide,
- Leaked gas,
- Multi-stage ejector,
- Structure optimization

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References(21)

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