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在航空燃气涡轮发动机的二次流空气系统中,涡轮盘腔的流动和换热问题具有复杂的热边界条件,其流场和换热特性对发动机的设计具有重要作用。基于单项式和多项式边界条件下的自由盘的湍流流动换热模型,应用FLUENT进行数值研究。通过与理论值的对比,验证了使用Relizible k-ε湍流模型用于研究自由盘面上湍流的适用性。研究发现,对于不可压的湍流,盘面的局部努塞尔数受温度分布的控制,盘面温度为任意n次多项式分布下的局部努塞尔数可由盘面温度按0-n次单项式分布时的结果导出。
In the secondary gas flow system of aero-gas turbine engines, the flow and heat transfer problems in the turbine disk have complex thermal boundary conditions, and the flow field and heat transfer characteristics play an important role in engine design. Based on the turbulent flow heat transfer model of a free disk under the boundary conditions of monomial and polynomial, FLUENT was used to conduct numerical study. By comparing with the theoretical value, the applicability of using Relizible k-ε turbulence model to study the turbulent flow on a free disk surface is verified. The study found that for incompressible turbulence, the local Nusselt number of the disk surface is controlled by the temperature distribution. The disk surface temperature is the result when the local Nusselt number for any n-order polynomial distribution can be given by the 0-n subdivision of the disk surface temperature Export.