Study on Time-Averaged Turbulent Conservation Equations under Supercritical Condition
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摘要: 为探索超临界条件下物性脉动作用于流体传质传热的机理,从Navier-Stokes方程出发,采用Reynolds时间平均和质量加权平均相结合的方法,获得考虑物性脉动的超临界条件下湍流时均化输运方程。研究表明,超临界条件下的湍流控制方程主体结构与亚临界湍流控制方程相似,只是在湍动能和湍流耗散率输运方程则新增物性脉动项。在超临界条件下这些物性脉动项不能忽略,它们会影响流体的脉动强度,改变由于流体速度脉动而发生的传质传热。Abstract: The turbulent time-averaged conservation equations of supercritical fluid is obtained by the methods of Reynolds-averaging or mass-averaging based on the Navier-Stokes equations,to study how the transportation of mass and energy of supercritical fluid is effected by the turbulence of thermal property.The result shows that,the turbulent control equations under supercritical condition are similar to that under sub-critical condition,except that there are turbulence terms of thermal property in the equations of turbulence kinetic energy and turbulence eddy dissipation conservation equations.These turbulence terms of thermal property are not ignorable under the condition of supercritical pressure,which having the effect on the turbulence strength of fluid to change the transportation of mass and energy.
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Key words:
- Supercritical /
- Turbulence model /
- Control equations /
- Turbulence of thermal property
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