基于Fluent的XPS保温箱温度场数值模拟方法分析

Temperature Field Simulation Method of XPS Incubator Based on Fluent

目的保温箱在空载情况下,探究不同模型对保温箱温度场模拟结果的影响。方法对现有保温箱内部温度场进行实测,与建立的保温箱有限元模型进行对比分析,验证模型可靠性,在此基础上进一步探究边界条件、辐射模型、对流模型对保温箱内温度场模拟结果的影响。结果通过验证网格无关性,得到最优流体网格尺寸为2.8mm;边界条件采用恒温固体壁面和对流换热壁面得到的温度场模拟结果最大温差为0.1 K;采用P1辐射、Rosseland、DO辐射和无辐射模型得到的模拟结果与实验结果最大温差分别为1.1, 4.2, 4.3, 4.3 K;采用层流模型和湍流模型得到的模拟结果与实验结果最大温差分别为0.6 K和1.9 K。结论随着网格尺寸的减小,温度场模拟数据逐渐趋于平稳;边界条件采用恒温固体壁面和对流换热壁面得到的温度场模拟结果基本一致;对比P1, Rosseland, DO和无辐射模型,P1辐射模型得到的模拟结果与实验结果一致性较好;与湍流模型相比,层流模型得到的模拟结果与实验结果一致性较好。

The work aims to explore the effect of different models on the temperature field simulation results of the incubator under no-load conditions. The actual temperature field in the existing incubator was measured and comparatively analyzed with the established finite element model of the incubator to verify the reliability of the model. Based on that, the effects of boundary conditions, radiation model and convection model on the simulation results of temperature field in the incubator were further explored. By verifying mesh independence, the optimal fluid mesh size obtained was 2.8 mm. The constant temperature solid wall and the convective heat transfer wall were used by the boundary conditions to obtain the maximum temperature difference between the temperature field simulation results, which was 0.1 K. The maximum temperature difference between the simulation results and the experimental results obtained by P1 radiation, Rosseland, DO radiation and non-radiation model was 1.1, 4.2, 4.3, 4.3 K, respectively. The maximum temperature difference between the simulation results and the experimental results obtained by the laminar models and the turbulence models was 0.6 K and 1.9 K, respectively. With the decrease of mesh size, the simulated data of temperature field gradually become stable. The simulation results of temperature field obtained by the boundary conditions using the constant temperature solid wall and the convective heat transfer wall are basically the same. The simulation results of P1 radiation model agree well with the experimental results by comparing with P1, Rosseland, DO and non-radiation models. Compared with the turbulence model, the simulation results obtained from the laminar model agree well with the experimental results.