多分散细水雾遮蔽热辐射的高效计算方法

Calculation of radiative heat shielding with polydisperse water sprays

建立了多分散细水雾0.8~20μm辐射特性参数数据库和谱带-灰体模型,并提出了采用数据库调用获取辐射特性参数、采用谱带-灰体模型处理细水雾非灰特性相结合的方法.通过将该方法计算的无量纲辐射热流与采用Mie理论和窄谱带模型计算的结果作对比,证明该方法准确可靠.通过精度分析和效率分析,证明所提方法既可保证精度在可接受的水平,又能使计算时间大幅缩减.

A database of radiative properties of sprays covering the wavelength range of 0.8 - 20 μm and droplets radius range of 1 -300 μm was constructed. A method of combining database calls for radiative properties acquisition and spec- tral bands-grey assumption model for processing the non-grey characteristics of sprays was proposed. The result for di- mensionless radiative heat flux calculated with the method was compared with the results obtained by this method and got by Mie theory and spectral bands model with Monte Carlo method. It was found that the method of database calls combined with spectral bands-grey assumption model can not only guarantee the calculation accuracy at an acceptable level, but also reduce the CPU time significantly.