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从能见度的一般定义出发,研究了大气能见度和火灾环境中空间能见度的计算理论及方法,推导了烟气浓度和能见度的主要计算公式和参数,给出了计算模型,并以Fluent软件为工具,用自定义函数的方法将能见度的计算加入火灾烟气的CFD计算中,同FDS能见度计算结果的对比显示,二者的计算结果基本一致。最后,本文提出应逐步细化能见度计算的参数,进一步提高火灾环境下能见度计算的精度。
Based on the general definition of visibility, the calculation theory and method of spatial visibility in atmospheric visibility and fire environment are studied. The main calculation formulas and parameters of flue gas concentration and visibility are deduced. The calculation model is given. With Fluent software as tool, The calculation of visibility is added into the CFD calculation of fire smoke with a custom function method. Comparing with the FDS visibility calculation results, the calculation results of the two are basically the same. Finally, this paper proposes that the parameters of visibility calculation should be gradually refined to further improve the accuracy of visibility calculation in fire environment.