钻孔式气膜冷却火焰筒壁温计算

CALCULATION OF WALL TEMPERATURE OF FLAME TUBE WITH HOLE-DRILLED FILM-COOLED CONSTRUCTION

本文以WP-7乙火焰筒为例,对钻孔式气膜冷却火焰筒壁温做数值计算 1.物理模型和热平衡方程 图1为WP-7乙火焰筒结构简图,火焰筒共有搭接焊接的5个气膜冷却段。 (1)气膜冷却腔道内的传热分析 气膜冷却空气流过图2所示的气膜冷却腔道,它是由前一气膜冷却段壁面的后部(内侧壁)和后一气膜冷却段壁面的前部(外侧壁)

This paper deals with a numerical method tor calculating the wall temperature profile of turbo-jet dame tube with hole-drilled film-cooled construction. Some factors affecting the accuracy of calculation of wall temperature, such as longitudinal conduction in the flame tube wall, contact conduction at the joints of the film cooling sections, convection on the end surfaces of the film cooiing sections, the temperature rise of the secondary cooling air in the annular cooling passage andl the variation of physical properties with temperature, are considered. A convection-conduction-radiation coupled iterative method is used to solve the problem with complex boundary conditions including longitudinal conduction between two individually cooled louvers. As an example, the wall temperature profile of WP-7B flame tube with hole drilled film-cooled construction has been calculated. Owing to improvement of the calculation method, the calculated temperature profile agrees well with that shown by thermal paint.