电加热倾斜管温度场分布计算

考虑自然对流对倾斜上升管内流体传热的影响，将外壁温度与外壁热负荷作为边界条件，同时将内热源作为并联网格电阻放热来进行处理，为电加热倾斜管温度场分布建立二维数学模型。根据空间节点推进的控制容积差分法求解流体换热和管壁导热耦合决定的电加热倾斜管二维温度场导热反问题，编制计算程序，针对我国第一台超临界锅炉螺旋管圈水冷壁的管型进行了管壁温度场的计算。在亚临界及超临界压力工况下，计算结果都可以很好地反映倾斜管壁温的分布规律，同时计算收敛性良好。

Calculation of the Temperature Field Distribution in an Electrically Heated Inclined Tube

Taking into account the impact of natural convection on the fluid heat transfer in an inclined riser tube the outer wall temperature and heat load are assumed as boundary conditions.Meanwhile,with the internal heat source being treated as a parallel-connected network resistance heat-release a two-dimensional mathematical model was set up for assessing the temperature field distribution in an electrically heated inclined tube.A controlled-volume differential method based on spatial node advance was used to solve the inverse problem of a two-dimensional temperature field heat conduction in an electrically heated inclined tube,which is determined by the coupling of fluid heat exchange and tube wall heat conduction.A computation program was prepared and the calculation of tube-wall temperature field conducted for the tube type of the spiral tube-coil water-wall of the first supercritical-parameter boiler in China.Under the operating condition of subcritical and supercritical pressures the calculation results can all truly reflect the wall-temperature distribution law of the inclined tube with a fairly good computation convergence being attained.