超临界水拟临界区的物性变化对传热特性的影响分析

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基金项目:

国家国际科技合作专项(2012DFG6103)

Investigation of Effect of Supercritical Water Properties in Pseudocritical Region on Heat Transfer Characteristics

1. CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology, Nuclear power institute of China, Chengdu, 610041, China;
2. Department of Engineering Physics, Tsinghua University, Beijing, 100084, China

摘要: 超临界水的拟临界区是物性的剧烈变化区,对超临界水的流动传热具有重要影响,这个区域的物性数据直接影响到数值计算的可靠性。本文基于2个超临界实验工况利用FLUENT计算流体力学软件,分析超临界水在拟临界区的物性数据对传热特性数值计算结果的敏感性,并基于FLUENT软件的用户自定义函数(UDF)扩展其物性处理方式。通过与实验工况进行比较,认为改进后的物性处理方式有助于提高数值计算的预测精度。
- 超临界水 /
- 物性 /
- 用户自定义函数(UDF)
Abstract: The water property will have a big variation in the pseudo-critical region under supercritical conditions and largely impact the heat transfer and fluid flow characteristics of the supercritical water. The water property data will directly affect the credibility of the numerical prediction results. In this study, the FLUENT software was used as the simulation platform to analyze the sensitive factor of water properties to heat transfer behaviors based on two supercritical water heat transfer experiments and a new method of improving the capacity of water properties was established with user defined functions（UDF）. The new water property dealing method improved the prediction capability in comparison with the experimental results.
- Supercritical water /
- Water property /
- User defined function（UDF）