湍流普朗特数模型对水平圆管内sCO_(2)传热预测的影响  

Influences of Turbulent Prandtl Number Models on Predicting sCO_(2) Heat Transfer in Horizontal Circular Tubes

作　　者：谢雄州 叶道铭 黄俊辉 王建勇 XIE Xiongzhou;YE Daoming;HUANG Junhui;WANG Jianyong(School of Aeronautics and Astronautics,Shenzhen Campus of Sun Yat-sen University,Shenzhen 518107,China)

机构地区：[1]中山大学·深圳航空航天学院,深圳518107

出　　处：《动力工程学报》2023年第12期1539-1548,1584,共11页Journal of Chinese Society of Power Engineering

基　　金：深圳市科技计划资助项目(RCBS20210706092408013);国家自然科学青年基金资助项目(52006248)。

摘　　要：基于SST k-ω湍流模型系统探究了典型湍流普朗特数模型对水平圆管内超临界二氧化碳传热数值模拟的影响,并通过与实验数据的对比,分析不同湍流普朗特数模型的预测能力。结果表明:在弱浮升力效应下,定常湍流普朗特数(Prt=0.85)模型具有较可靠的预测能力,预测的壁温最大偏差小于5 K;但在强浮升力效应下,Prt=0.85时计算出现较大偏差,而引入的现有典型变湍流普朗特数修正模型改善效果不佳。经深层次分析发现,湍流普朗特数模型对超临界二氧化碳流动传热边界层的影响显著,从而决定湍流传热性能。The effects of different Prt models on the numerical simulations of turbulent heat transfer of supercritical carbon dioxide in horizontal tubes were systematically investigated using the SST k-ωturbulence model and the predictive capability of different Prt models was analyzed by comparing against experimental data.Results show that under the condition of low-level buoyancy,the constant turbulent Prandtl number of 0.85 exhibits a good predictive ability,and the maximum deviation for wall temperatures is less than 5 K.Under the condition of strong buoyancy,larger deviations appear for the predictions using Prt=0.85 and the existing models of variable turbulent Prandtl numbers that are corrected for supercritical heat transfer have been demonstrated to be invalid as well.Through in-depth analysis,the turbulent Prandtl number models have profound impacts on fluid flow&heat transfer of supercritical carbon dioxide in the boundary layer,and then determine the turbulent heat transfer performance.

关 键 词：超临界二氧化碳 水平圆管传热 湍流普朗特数 浮升力效应 传热预测 数值模拟 

分 类 号：TK124[动力工程及工程热物理—工程热物理]