强浮升力作用下超临界流体对流换热的湍流模型研究

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基金项目:

973项目(No.2007CB209800)

高等学校博士学科点专项科研基金项目(No.20070248026)

Study on Turbulence Model of Supercritical Fluids Flow and Heat Transfer under Strong Buoyancy

摘要: 针对湍流模型中浮升力相关项的模型进行了比较分析,在此基础上进行了一系列修正;最后,分别使用修正的模型和传统模型计算了超临界压力下的对流传热,并将计算结果与实验数据进行了比较。结果表明,修正的湍流模型能比较准确地模拟浮升力项,从而使计算得到的壁温与实验数据、DNS数据符合较好;而传统模型计算得到的壁温比实验数据、DNS数据高得多。
- 湍流 /
- k-ε模型 /
- 代数热通量模型 /
- 浮升力 /
- 超临界
Abstract: The buoyancy term of turbulence model is studied,and modification of the buoyancy model has been carried out.After that,several cases of supercritical flows with heat transfer are calculated and the results are compared with DNS and experiment data in the open literatures.The results show that the modified model can predict the buoyancy term correctly,and thus the calculated wall temperature agrees well with the experimental data and DNS data.In contrast,the wall temperature obtained by the traditional models is much higher than the experimental and DNS data.
- Turbulence /
- k-ε model /
- Algebraic flux model /
- Buoyancy /
- Supercritical