亚格子模型在窄通道内铅铋换热特性研究的适应性评价  

Adaptability evaluation of a subgrid model based on the heat transfer characteristics of lead-bismuth in a narrow channel

作　　者：王斐然 温济铭 田瑞峰[1,2] 张宴豪 王福阳 夏榜样 陈冲 张雪 谭思超 WANG Feiran;WEN Jiming;TIAN Ruifeng;ZHANG Yanhao;WANG Fuyang;XIA Bangyang;CHEN Chong;ZHANG Xue;TAN Sichao(College of Nuclear Science and Technology,Harbin Engineering University,Harbin 150001,China;Heilongjiang Provincial Key Laboratory of Nuclear Power System&Equipment,Harbin Engineering University,Harbin 150001,China;National Key Laboratory of Nuclear Reaction Technology,Chengdu 610213,China;State Key Laboratory of Advanced Nuclear Energy Technology,Chengdu 610213,China)

机构地区：[1]哈尔滨工程大学核科学与技术学院,黑龙江哈尔滨150001 [2]哈尔滨工程大学黑龙江省核动力装置性能与设备重点实验室,黑龙江哈尔滨150001 [3]核反应堆技术全国重点实验室,四川成都610213 [4]先进核能技术全国重点实验室,四川成都610213

出　　处：《哈尔滨工程大学学报》2024年第12期2341-2349,共9页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(U22B2093);领创基金。

摘　　要：针对使用雷诺时均模型对低普朗特数冷却剂的湍流换热特性研究时存在精确度不足及可靠性无法证实的问题,本文使用高保真的大涡模拟模型对铅铋合金在矩形通道内的湍流换热特性进行了对比研究。对于Pe=1100及湍流强度更小的工况,使用经典Smagorinsky-Lilly模型计算所得的对流换热系数偏高,而修正Smagorinsky-Lilly模型对过预测情况有优化的效果;对于Pe=2200及湍流强度更大的工况,由于Smagorinsky-Lilly模型不可解的小尺度粘性底层区域被压缩,使得模型参数Cs的改变对全局对流换热特性的影响被削弱。本文评估了不同的Smagorinsky-Lilly亚格子应力模型对窄矩形通道内铅铋湍流换热特性的模拟效果,当Pe≤1100时,Cs=0.18的模型对全局对流换热特性的计算结果过高;当Pe≥2200时,耗散模拟的过程受到Cs的影响减弱,全局对流换热特性受到Smagorinsky-Lilly模型参数的影响较小。湍流强度较低时,需要选取更小的模型参数以削弱过预测的效应。To address the challenges of low accuracy and unverifiable results when using the Reynolds time-averaged model to study turbulent heat transfer in low Prandtl number coolants,this study uses a high-fidelity large eddy simulation model.It compares the turbulent heat transfer characteristics of lead-bismuth in a rectangular channel.Under the conditions of Pe=1100 and lower turbulence intensity,the classic Smagorinsky-Lilly model tends to overpredict convective heat transfer characteristics.However,the modified Smagorinsky-Lilly model improves accuracy by mitigating this overestimation.For the conditions of Pe=2200 and higher turbulence intensity,the small-scale viscous bottom area that cannot be solved by the Smagorinsky-Lilly model is compressed,reducing the impact of model parameter Cs on global convective heat transfer characteristics.This research evaluates how different Smagorinsky-Lilly subgrid stress models simulate the turbulent heat transfer of low Prandtl number lead-bismuth eutectic in narrow rectangular channels.For Pe≤1100,models with Cs=0.18 produce results that are considerably overestimated.For Pe≥2200,the dissipation effect weakens owing to changes in Cs,leading to less impact on global convective heat transfer characteristics.When the turbulence intensity is low,smaller model parameters need to be selected to weaken the over-prediction effect.

关 键 词：大涡模拟模型 Smagorinsky-Lilly模型 壁面湍流 铅铋合金 矩形通道 高保真数值模拟 湍流应力 对流换热 

分 类 号：TL334[核科学技术—核技术及应用]