多孔燃料床火蔓延过程的数值分析

PREDICTIONS OF UNSTEADY BURNING OF A POROUS FUEL BED

本文以浮力修正的k-8湍流流动模型为基础,选用EBU的Magnussen版本的湍流燃烧模型,对多孔燃料床非定常燃烧现象进行数值模拟,所得结果定性合理。 另外,论文采用了空度的方法来处理多孔燃料床,同时考虑了研究体系内有源存在的情况,并对相应的方程进行了必要的修正,由于缺乏必要的实验数据,本文的计算结果没能与实验进行对比。

It is proposed to simulate a piece of forest by a porous fuel bed. The unsteady burning process of such a fuel bed is studied, by formulating and solving a set of governing equations. The buoyancy-modified, k-ε model and Magnussen-EBU model of combustioa is adopted.. The computational result is plausible.Additional source terms in the governing equations are proposed to represent the transfer processes between solid phase and gas phase of the porous bed. Also, porosity is introduced as a, concept and approach to express the blockage within the porous bed. As lacking of the ex-perimental data, predictions ate not compared with experiments.