基于气液耦合的中等尺度甲醇池火数值模拟  

Numerical Simulation of Medium-Scale Methanol Pool Fires Based on Gas-Liquid Coupling

作　　者：程崇律 张相冬 孔凡夫 单聪慧 徐宝鹏[1] CHENG Chonglü;ZHANG Xiangdong;KONG Fanfu;SHAN Conghui;XU Baopeng(School of Energy and Power,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学能源与动力学院,大连116024

出　　处：《工程热物理学报》2022年第10期2804-2813,共10页Journal of Engineering Thermophysics

摘　　要：本文提出了一种模拟池火的气液双向耦合的三维数值模型。该模型通过直接求解油池内部对流流动和气液共轭耦合传热确定池火的蒸发速率。气相区域利用大涡模拟方法求解经滤波过滤的三维可压缩N-S方程组,液相区域使用三维不可压缩层流控制方程求解流动,两相交界面处通过基于“薄膜理论”的蒸发模型及共轭传热方法求解传质传热过程。通过甲醇池火实验验证模型的准确性。计算结果表明该模型能准确计算燃油蒸发速率,由马兰戈尼效应诱导的液相内部对流运动对池火蒸发速率有一定影响。A three-dimensional numerical model based on gas-liquid two-way coupling method for simulating pool fire is proposed in this paper. The proposed model determines the evaporation rate of the pool fire by directly solving convective motion in the fuel region and using a gas-liquid coupled conjugate heat transfer approach. Large eddy simulation is used to solve the 3-D filtered compressible N-S equations in the gas region. Incompressible laminar flow formation is applied to the liquid fuel region. The evaporation model based on “film theory” and the conjugate heat transfer approach are used to solve the mass transfer and heat transfer at the liquid surface. The proposed model is validated against the methanol pool fire. The results show that the proposed model can accurately predicate mass burning rate, and the convection motion in the fuel region induced by the Marangoni effect has an important effect on pool fires.

关 键 词：池火 大涡模拟 气液耦合 马兰戈尼效应 

分 类 号：TQ038.3[化学工程]