石英灯阵高温试验环境换热特性仿真分析

为了分析高温试验环境下不同条件对试件温度的影响，文章建立了高温试验环境的传热模型，采用计算流体动力学（CFD）方法结合Discrete Ordinates（DO）辐射模型，计算分析了不同热源温度、不同试件尺寸以及隔热层有无加装反射涂层情况下石英灯加热器加热试件时的温度分布特性。结果表明：在同样的热源温度下，隔热层加装反射涂层的试件表面温度比无反射涂层隔热层的高18%；由于边界效应的弱化，大尺寸试验件的表面不均匀度＞14%，而小尺寸试验件的表面不均匀度＜1%；使用小尺寸试验件且隔热层有反射涂层时，在150 s、试验件温度达到1500 ℃时需要的加热热流密度达1122 kW/m²。以上研究结果可为高温环境模拟试验台的设计提供参考。

Heat transfer simulation of high-temperature test environment with quartz lamp array

In order to analyze the influence of different conditions on the temperature of the test piece in the high temperature test environment, a heat transfer model is established for the high temperature test environment. The method of the computational fluid dynamics (CFD) combined with the Discrete Ordinates (DO) radiation model is used to calculate and analyze the temperature distributions when the test piece is heated by the quartz lamp heater. The isothermal boundary conditions are adopted, and the calculations are carried out for different heat source temperatures, different specimen sizes, and for a surrounding heat insulation layer with and without a reflective coating, respectively. The simulation results show that: with the same heat source temperature, the temperature of the specimen under the heat insulation layer with reflective coating is 18% higher than that of the specimen under the heat insulation layer without reflective coating. Due to the boundary effect, the surface uniformity is over 14% for the large-scale specimen, while it is less than 1% for the small size test piece. The heat flux is required to be 1122 kW/m2 for raising the temperature of the test piece to 1500 ℃ within 150 s for the test piece of a small size and surrounded by the insulation with reflective coating. The above results can be used for the design of the high temperature environmental simulation test bed.