辐射热线法计算三维辐射传热的数学模型及其应用

A MATHEMATICAL MODEL FOR SOLVING THREE- DIMENSIONAL RADIATIVE HEAT TRANSFER BY RADIATIVE HEAT RAY METHOD

一、前言 求解以锅炉炉膛为对象的辐射热传递问题,目前常用的方法有热通量法,区域法和蒙特卡洛法。 作者们曾针对蒙特卡洛法进行了分析及改进。近来又提出了不使用概率运算的辐射热线法,可用较短时间求得精确的解。但目前该法只用于2维且壁面是黑体的情况。 本文在辐射热线法中引入壁面有效辐射的概念,就三维的长方体检定了以短时间求得精确解的条件。在此基础上,将该法应用于城市煤气改质炉的传热计算。

By introducing the wall-radiosity concept, a Radiative Heat Ray method is developed to solve three-dimensional combined radiative and convective heat transfer problems for systems surrounded by gray walls. Parameters which influence the calculating accuracy are analyzed, and this method is applied to a cylindrical gas reformer to obtain the profiles of gas and wall temperature as well as the tube-surface heat flux. The results indicate that the jet angle of heating burner has important effects on tube-surface heat flux and gas temperature distributions.