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本文对被动隔热导流板在周期射流冲击环境下的流场特性及热响应特性进行三维数值研究,分析了射流喷管与导流板间距、导流板水平倾角及轴向倾角三个参数的影响规律。研究结果表明射流空气冲击到导流板后90%的气流被向上侧及前后两侧偏导,导流板的水平倾角越大则气流向上侧偏导能力越弱,轴向倾角的存在可实现对气流前后侧导流流量的分配。导流板耐热层温度在进入第四个射流周期后呈现稳定周期波动,射流冲击距离越小、导流板水平倾角越大则其板面温度水平越高。
In this paper, the three-dimensional numerical simulation of the flow field and thermal response of the passive insulation baffle under cyclic jet impact is carried out. The three parameters of the jet nozzle and the baffle, the horizontal inclination of the baffle and the axial inclination are analyzed. The law of influence. The results show that 90% of the airflow impinging on the deflector is deflected to the upper side and the front and the back. The larger the horizontal inclination of the deflector is, the weaker the deflecting ability of the airflow toward the upper side. The existence of the axial inclination can be realized The distribution of the flow before and after the diversion of airflow. After entering the fourth jet cycle, the temperature of the heat-resistant layer of the baffle plate shows a stable periodic fluctuation, the jet impact distance is smaller, and the greater the horizontal inclination of the baffle is, the higher the plate surface temperature level is.