箱带模型结合DOM在非灰气体辐射换热计算中的应用

Application of box model and discrete ordinate method in investigation of non-gray gas radiative heat transfer

在总结现有计算非灰气体辐射特性的各种模型与方法的基础上 ,利用箱带模型与离散坐标法 (DOM)相结合的方法计算了一维无限大平行平板间气体介质在均匀型、边界层型及抛物型三种温度分布下的辐射换热。研究表明 ,箱带模型与常用的统计窄带模型或指数宽带模型的灰带近似计算结果相比具有较好的准确性 ,且由于箱带模型具有简单、易于编程、计算速度快等优点 ,对一些较为复杂的工程计算问题是一种较好的可供选择的模型。

Based on a survey of various models and treatment methods for the calculation of radiative properties of gases, box model, which is similar to the gray band approximation of spectral band model, was applied to evaluate the gas properties. In order to compare the accuracy of box model with that of gray band approximation of spectral band models, a typical one-dimensional gas radiation problem was analyzed using discrete ordinate method. Comparing with the widely used gray band approximation of narrow band model or exponential wide band model, box model can well evaluated the radiation source term of the radiative problem. For its simplicity and easy for programming, the box model is practicable and useful for some complex engineering problems.