基于超临界流体传热弱化机理的湍流模型开发

项目名称： 基于超临界流体传热弱化机理的湍流模型开发

项目编号： No.51206107

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 工程热物理与能源利用学科

项目作者： 熊进标

作者单位： 上海交通大学

项目金额： 25万元

中文摘要： 超临界流体的传热弱化现象因超临界水冷堆的研发而受到广泛关注。目前对传热弱化现象的研究仍以宏观传热数据为基础，缺乏对传热弱化局部流动机理的认识。而计算流体力学（CFD）作为流动传热局部现象的重要研究手段，其在超临界流体传热弱化研究中的应用仍苦于没有适当的湍流模型。从以上两个基本问题出发，本课题采用宏观传热测量与局部可视化流场测量相结合的方法研究超临界氟利昂中的传热弱化，建立传热弱化的宏观传热与可视化流场实验数据库。基于实验数据，研究传热弱化所伴随的流场特征,归纳宏观传热弱化现象与局部流动现象之间的联系规律。以所得到的机理认识为基础，利用文献中的传热弱化直接模拟数据，开发能准确预测传热弱化现象的湍流模型；并利用所建立的实验数据库，从局部流场和宏观传热两个方面来验证并优化湍流模型。所提出的湍流模型将为CFD在超临界流体传热弱化研究中的应用夯实基础。

中文关键词： 超临界流体；传热弱化；湍流模型开发；实验测量；模型验证

英文摘要： Heat transfer deterioration (HTD) in supercritical fluids became concerned in the field of heat transfer due to the start of research and development of the supercritical water-cooled reactor in many countries. The past studies have been mainly based on the integral heat transfer data, while the understanding of local phenomena is very little. Even though it is a useful tool to acquire the local phenomena in the flow, computational fluid dynamics (CFD) is still suffering from shortage of competent turbulent models. With the recognition of the above challenges this project combines experimental study and theoretical derivation in the process of turbulence model development. In the experiment study the integral heat transfer measurement and the flow visulization measurement are applied at the same time in order to investigate the relation between HTD and local flow features. The HTD mechanism can then be generalized based on the relation. Accounting for the HTD mechanism a new turbulence model is proposed with the aid of the direct numerical simulation (DNS) data already available in the literature. The proposed model is further optimized and validated with the assitance of the experiment data obtained in this project. The performance of proposed model is judged in the viewpoint of its prediction performance for b

英文关键词： Supercritical fluid；heat transfer deterioration；turbulence model development；experiment investigation；model validation