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用实验测量和理论计算相结合的方法,研究了具有发散冷却功能的曲面结构边界层流动和换热特性.半球形实验件由高温合金钢粉末烧结的多孔材料制成,孔隙率和特征尺寸分别为0.37和20μm.实验件外部的热流温度及速度由热风洞的控制系统给定,内部的冷气流量由数字式质量流量控制器给定,外表面温度由NEC TH5104远红外热像系统测量.利用FLUENT软件中的二维、稳态、局部热平衡模型,对实验件进行发散冷却特性数值模拟,并通过与实验数据的比较,验证数学模型和数值方法.
The flow and heat transfer characteristics of the boundary layer with divergent cooling function were studied by the combination of experimental measurements and theoretical calculations.The hemispherical test pieces were made of porous materials sintered with high temperature alloyed steel powder and the porosity and feature size were 0.37 and 20μm.The temperature and speed of the heat flux outside the experimental part were given by the control system of the hot wind tunnel.The internal air flow was given by the digital mass flow controller and the temperature of the external surface was measured by NEC TH5104 far infrared thermal imaging system. The two-dimensional, steady-state and local thermal equilibrium models in FLUENT software are used to simulate the divergent cooling characteristics of experimental parts. The mathematical models and numerical methods are verified by comparison with the experimental data.