Study on Heat Transfer Characteristics of Characteristic Flow Channels in Additive Manufacturing Steam Generator

XU Jianfeng; HE Gening; WANG Yongjie; CONG Tenglong; GU Hanyang

doi:10.7512/j.issn.1001-2303.2026.04.08

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Study on Heat Transfer Characteristics of Characteristic Flow Channels in Additive Manufacturing Steam Generator
Vol. 56, Issue 4, Pages: 65-74(2026)
Received：14 December 2025，

Revised：2026-02-01，

Published：20 April 2026
DOI： 10.7512/j.issn.1001-2303.2026.04.08
稿件说明：

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徐建锋，何戈宁，王永杰，等.增材制造蒸汽发生器特征流道的传热特性研究［J］.电焊机，2026，56（4）：65-74. DOI： 10.7512/j.issn.1001-2303.2026.04.08.

XU Jianfeng, HE Gening, WANG Yongjie, et al.Study on Heat Transfer Characteristics of Characteristic Flow Channels in Additive Manufacturing Steam Generator[J].Electric Welding Machine, 2026, 56(4): 65-74. DOI： 10.7512/j.issn.1001-2303.2026.04.08.

摘要

蒸汽发生器是压水堆核电系统核心换热设备，其流道传热性能直接影响机组效率与安全性。本研究基于金属增材制造制备GH3625合金六边形窄通道试验件，设计0°、360°、720° 三种扭转角内置肋片结构，并开展了系统的气液两相流传热试验与数值模拟。试验在开式循环回路中进行，通过改变质量流速、热流密度，获取单相液、过冷沸腾、饱和沸腾、干涸及单相汽区的对流换热系数，并与常见经验公式进行对比。结果表明，质量流速显著强化各区间换热，高热流密度在低含气率区强化换热，在高含气率区对换热影响不大，而扭转角越大，二次流与界面更新越强，传热能力越高。数值模拟进一步揭示了扭转肋片对流场结构和空泡分布的调控作用。在单相汽区，传统经验公式明显低估换热性能，基于实验数据提出的新经验关系式可显著提高预测精度。研究结果验证了增材制造在蒸汽发生器流道传热强化中的可行性，并为其结构优化提供了依据。

Abstract

To enhance the heat transfer performance of steam generator channels

this study fabricated three hexagonal narrow channel test samples with rib structures having different twist angles using metal additive manufacturing. Systematic gas-liquid two-phase flow heat transfer experiments and numerical simulations were conducted. The experiments were carried out in an open-loop circulation system

where the mass flow rate and heat flux density were varied to obtain convective heat transfer coefficients in single-phase liquid

subcooled boiling

saturated boiling

dryout

and single-phase gas regions

and compared with common empirical formulas. The results showed that the mass flow rate significantly enhanced heat transfer across all regions. High heat flux density strengthened heat transfer in the low gas content region but had little effect in the high gas content region. The larger the twist angle

the stronger the secondary flow and interface renewal

leading to higher heat transfer capability. Numerical simulations further revealed the influence of the twisted ribs on the convective flow structure and bubble distribution. In the single-phase gas region

traditional empirical formulas significantly underestimated the heat transfer performance

while a new empirical correlation proposed based on experimental data significantly improved prediction accuracy. The study confirms the feasibility of additive manufacturing in enhancing heat transfer in steam generator channels and provides a basis for structural optimization.

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references

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