水火弯板数值模拟中热源模型参数研究

Investigation on parameters of heat input model in numerical simulation of line heating

水火弯板热源热流密度模型的选取和定义,是水火弯板数值模拟中一个关键问题.采用高斯分布热流密度模型对水火弯板中的气体火焰热源展开了研究,利用实验和数值模拟相结合的方法,通过在一定范围内调整热流密度模型中的热源半径r和热效率η等参数,使数值计算的温度场分布趋近于实验测量的温度场分布,确定了水火弯板热源热流密度模型.在一定丙烯流量范围内,分析了热源半径和热效率的插值偏差对计算结果的影响,结果表明该模型能够满足水火弯板数值计算的精度要求.算例验证了该热源模型在有限元计算中的可靠性.

The definition of heat flux is important to the numerical simulation of line heating process. The heat flux model of gas flame has been developed by utilizing Gauss distribution heat input model and the methods of experiment combining with numerical simulation. The parameters of heating efficiency and heating radius in the heat input model are adjusted to a possible range to make the temperature distribution of numerical simulation approach to the data measured in experiment, and then the heat flux model is determined. In a definite range of the flow rate of propylene, the effects of heating efficiency and heating radius deviations on the simulation results are analyzed. The results show that the requirements of accuracy in line heating numerical simulation can be satisfied by using this model. The reliability of the heat input model in the simulation is also verified by the example.