摘要
船用燃气轮机的排气温度很高,为了降低排气管道和排气烟羽的红外辐射,在排气喷管上方安装排气引射装置,利用引射原理卷吸环境中的冷空气,降低排气温度,同时在壁面上形成冷却气膜,防止壁面温度升高。排气引射装置的扩压管为多级圆环结构组成,文中利用数值计算的方法模拟了扩压管圆环间狭缝结构对壁面温度的影响,得到了壁面上的温度分布,确定了冷却气膜的长度,为扩压管的设计提供了参考。
The exhaust temperature of marine gas turbine is very high. In order to reduce infrared radiation in exhaust pipe and exhaust plume, an ejector device is needed to be installed above the exhaust pipe. The temperature of exhaust gas is reduced by suction of cold air and a cooling gas film on pipe wall to prevent temperature rise. The diffuser pipe of the ejector device is composed of multilevel ring structure. Numerical simulation was applied to simulate the influence of multilevel ring structure on the temperature of pipe wall. The wall temperature distribution and length of cooling gas film was obtained. The purpose was to provide reference for design of diffuser pipe.
出处
《装备环境工程》
CAS
2012年第4期42-46,78,共6页
Equipment Environmental Engineering
关键词
排气
引射
扩压管
冷却气膜
exhaust
ejector
diffuser pipe
cooling gas film
