摘要
为了掌握矩形尾喷管的宽高比对其羽流温度场的影响,建立了矩形尾喷管的物理数学模型,并基于N-S方程和RNG湍流模型,采用Fluent-CFD软件对宽高比分别为1,2,4和8的四种矩形尾喷管三维外流场进行了数值模拟,研究了矩形尾喷管羽流横截面等温线的特点和宽高比对羽流高温核心区长度的影响。研究结果表明,宽高比越大,羽流与周围冷空气的摩擦与掺混越强,热量扩散越快,高温核心区越短。因此,在降低高温羽流红外辐射上,大宽高比矩形喷管更有优势。
In order to master the influence of aspect ratio of a rectangular nozzle on exhaust plume temperature field, physical and numerical models of different rectangular nozzles were established based on N-S control equations and RNGturbulence model,then the 3-D exterior flow fields of the rectangular noz- zles with aspect ratio of 1,2,4 and 8 were simulated through numerical method by the software Fluent- CFD,and the characteristic of cross section isotherm of exhaust plume and the influence of different aspect ratios on length of the plume high temperature core area were researched.The results show that, with the in- crease of aspect ratio, the blend and the friction of plume and cold atmosphere are more intense, and the heat of exhaust plume diffuses more quickly,then the length of the plume high temperature core area is shorter. Therefore ,a Rectangular Nozzle with big aspect ratio is more advantageous to reduce infrared radi- ation of high temperature plume.
出处
《机械设计与制造》
北大核心
2012年第12期224-226,共3页
Machinery Design & Manufacture
基金
安徽省红外与低温等离子体重点实验室博士基金项目(2012B33)
关键词
宽高比
尾喷管
羽流
温度场
Aspect Ratio
Nozzle
Exhaust Plume
Temperature Field
