CAJ | 학술논문

通过两组典型实验数据，对商业软件C FX的12种湍流模型用于模拟超临界水竖直向上流动传热的性能进行评价。研究结果表明：强迫对流时，BSL代数应力模型与实验结果符合最好，但各模型间差异均不大；混合对流时，基于壁面函数的ε类型湍流模型不能模拟传热恶化趋势，自动壁面处理的ω类型湍流模型能模拟出传热恶化的趋势，但各模型预测结果和实验结果相差较大。评价结果表明近壁面的处理方式对模拟结果影响很大。此外，基于湍流普朗特数模拟湍流热流密度及未考虑密度脉动对传热的影响均是导致不能正确模拟超临界水传热行为的因素，建议对湍流模型进行改进。
통과량조전형실험수거，대상업연건C FX적12충단류모형용우모의초림계수수직향상류동전열적성능진행평개。연구결과표명：강박대류시，BSL대수응력모형여실험결과부합최호，단각모형간차이균불대；혼합대류시，기우벽면함수적ε류형단류모형불능모의전열악화추세，자동벽면처리적ω류형단류모형능모의출전열악화적추세，단각모형예측결과화실험결과상차교대。평개결과표명근벽면적처리방식대모의결과영향흔대。차외，기우단류보랑특수모의단류열류밀도급미고필밀도맥동대전열적영향균시도치불능정학모의초림계수전열행위적인소，건의대단류모형진행개진。
Based on two sets of experimental data ,the performance of predicting heat transfer of supercritical water in a vertical tube using CFX code with 12 turbulence models was assessed .The result of BSL explicit algebraic Reynolds stress model agrees the most closely with the experimental data under forced convection ,but the differences among various turbulence models are small . However , under mixed convection condition ,εtype turbulence models with wall function can not predict heat transfer deterioration phenomenon , while ω type turbulence models with automatic wall treatment can ,but the predicted wall temperatures deviate largely from experimental results .The assessment results show that near wall treatment methods have great influence on the simulation results . The following two factors also lead to the unreasonably predicted heat transfer behavior : Modeling turbulent heat flux with turbulent Prandtl number and neglecting density fluctuation . It is recommended that turbulence models should be improved .