Research on Phase Distribution Characteristics of Flow Field downstream the Spacer Grid in 5<inline-formula><tex-math id="M1">\begin{document}$ \times $\end{document}</tex-math></inline-formula>5 Rod Bundle

Cao Mingze; Yan Xiao; Zhang Junyi; Gong Suijun; Xing Dianchuan; Xu Jianjun

doi:10.13832/j.jnpe.2025.S1.0033

Volume 46 Issue S1

Jul. 2025

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Article Navigation > Nuclear Power Engineering > 2025 > 46(S1): 33-40

Cao Mingze, Yan Xiao, Zhang Junyi, Gong Suijun, Xing Dianchuan, Xu Jianjun. Research on Phase Distribution Characteristics of Flow Field downstream the Spacer Grid in 5$ \times $5 Rod Bundle[J]. Nuclear Power Engineering, 2025, 46(S1): 33-40. doi: 10.13832/j.jnpe.2025.S1.0033

Citation:

Cao Mingze, Yan Xiao, Zhang Junyi, Gong Suijun, Xing Dianchuan, Xu Jianjun. Research on Phase Distribution Characteristics of Flow Field downstream the Spacer Grid in 5$ \times $5 Rod Bundle[J]. Nuclear Power Engineering, 2025, 46(S1): 33-40. doi: 10.13832/j.jnpe.2025.S1.0033

Citation:

Cao Mingze, Yan Xiao, Zhang Junyi, Gong Suijun, Xing Dianchuan, Xu Jianjun. Research on Phase Distribution Characteristics of Flow Field downstream the Spacer Grid in 5$ \times $5 Rod Bundle[J]. Nuclear Power Engineering, 2025, 46(S1): 33-40. doi: 10.13832/j.jnpe.2025.S1.0033

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Research on Phase Distribution Characteristics of Flow Field downstream the Spacer Grid in 5$ \times $5 Rod Bundle

doi: 10.13832/j.jnpe.2025.S1.0033

National Key Laboratory of Advanced Nuclear Energy Technology, Nuclear Power Institute of China, Chengdu, 610213, China

Received Date: 2024-05-05
Rev Recd Date: 2025-01-20
Publish Date: 2025-07-09

Abstract

Abstract

In order to research the phase distribution characteristics downstream the spacer grid in 5×5 rod bundle, a new type of wire mesh sensor suitable for the prototype size of 5×5 rod bundle was designed and fabricated, and the distance between measuring points was 1.05 mm. The void fraction measurement experiment of air-water two phase flow in the 5×5 rod bundle with spacer grid was carried out. The void fraction distribution characteristics within the channel were analyzed, and the phase distribution characteristics induced by gas-phase accumulation due to spacer grid mixing vanes were identified. The experimental results show that due to the overturning effect of lift, bubbles gather near the rod wall under low void fraction conditions, while bubbles appear in the center of subchannel under high void fraction conditions. The spacer grid mixing vanes cause a certain migration of the gas peak position in the channel, and gas accumulation related to the orientation of boundary mixing vanes is also observed at the side wall of the rod bundle channel. The developed wire mesh sensor can be used to measure the void fraction in the downstream flow field of more types of spacer grids, and provide reference for the structural optimization design of spacer grids.
- 5×5 rod bundle channel,
- Wire mesh sensor,
- Spacer grid,
- Void fraction

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References(19)

References

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