Experimental Study on Critical Flow of Supercritical Carbon Dioxide at Transient State

Zhang Dongxu; Li Weiqing; Zhao Minfu; Liang Peng; Xu Yongwang; Li Qingyuan; Duan Minghui

doi:10.13832/j.jnpe.2023.05.0232

Volume 44 Issue 5

Oct. 2023

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Article Navigation > Nuclear Power Engineering > 2023 > 44(5): 232-236

Zhang Dongxu, Li Weiqing, Zhao Minfu, Liang Peng, Xu Yongwang, Li Qingyuan, Duan Minghui. Experimental Study on Critical Flow of Supercritical Carbon Dioxide at Transient State[J]. Nuclear Power Engineering, 2023, 44(5): 232-236. doi: 10.13832/j.jnpe.2023.05.0232

Citation:

Zhang Dongxu, Li Weiqing, Zhao Minfu, Liang Peng, Xu Yongwang, Li Qingyuan, Duan Minghui. Experimental Study on Critical Flow of Supercritical Carbon Dioxide at Transient State[J]. Nuclear Power Engineering, 2023, 44(5): 232-236. doi: 10.13832/j.jnpe.2023.05.0232

Citation:

Zhang Dongxu, Li Weiqing, Zhao Minfu, Liang Peng, Xu Yongwang, Li Qingyuan, Duan Minghui. Experimental Study on Critical Flow of Supercritical Carbon Dioxide at Transient State[J]. Nuclear Power Engineering, 2023, 44(5): 232-236. doi: 10.13832/j.jnpe.2023.05.0232

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Experimental Study on Critical Flow of Supercritical Carbon Dioxide at Transient State

doi: 10.13832/j.jnpe.2023.05.0232

Reactor Engineering Technology Research Institute, China Institute of Atomic Energy, Beijing, 102413, China

Received Date: 2022-11-17
Rev Recd Date: 2022-12-14
Publish Date: 2023-10-13

Abstract

Abstract

When a break accident occurs in a supercritical system, the high-temperature and high-pressure fluid in the system will have a critical flow at the break, and the transient critical flow characteristics have a great influence on the process of the accident. Compared with the steady state of critical flow, the pressure relief speed in the process of transient blowout has an important influence on the critical mass flow rate. Therefore, a transient test of critical flow with supercritical carbon dioxide (SCO₂) as working medium was carried out. A nozzle with a diameter of 2 mm, a length diameter ratio (L/D) of 3 and a rounded inlet was used as the test section. The initial pressure was 7.70~7.98 MPa and the initial temperature was 35.5-40.6℃. Transient tests with four depressurization velocities were carried out. The experimental results show that the greater the velocity of depressurization, the smaller the critical mass flow rate at the initial stage of blowout. However, at the later stage of blowout, the greater the velocity of depressurization, the greater the critical mass flow rate.
- Supercritical carbon dioxide,
- Critical flow,
- Transient test,
- Velocity of depressurization

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References(9)

References

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