摘要
三通管内冷热水掺混过程会使管道近壁面承受周期性热波动,诱发管道穿透裂纹,进而造成管道热疲劳失效。为研究三通管内冷热水掺混特性,基于嵌入式大涡模拟(ELES)方法对三通管内冷热掺混过程进行了数值仿真,包括对不同动量比工况下的流场、温度场进行了模拟计算,计算结果表明:支管流体在主管流体的压迫下,流动方向发生偏折,在支管背流面形成了大小不一的涡旋,随着动量比的不断减小,涡旋区域不断扩大,涡旋的大小也逐渐增大;随着动量比减小,冷热水掺混进行的更加剧烈,掺混区域变短;对温度波动绘制了功率谱密度图,主频率集中在10Hz以下范围内。
The mixing process of hot and cold water in the tee junctions may cause periodic heat fluctuation near the pipe wall, which can induce pipeline penetrating cracks and then cause thermal fatigue failure of the pipeline. In order to study the mixing characteristics of hot and cold water in tee junctions, a numerical simulation of the mixing process in tee junctions was carried out based on the embedded large eddy simulation(ELES) method. The results of flow field and temperature field under different momentum ratio conditions are obtained, (1) Under the impact of the main pipe fluid, the flow direction of the branch fluid deflects, and vortices of different sizes are formed on the back surface of the branch pipe. With the decrease of momentum ratio, the region expands and the size of the vortices increases gradually. (2) with the decrease of momentum ratio, the mixing of hot and cold water is more intense and the mixing area becomes shorter. (3) the power spectral density map is drawn for temperature fluctuation, and the main frequency is concentrated in the range below 10 Hz.
作者
李泽伟
王合旭
蒋彦龙
陈冀
LI Ze-wei;WANG He-xu;JIANG Yan-long;CHEN Ji(School of Aeronautics and Astronautics,Nanjing University of Aeronautics&Astronautics,Nanjing Jiangsu 210000,China)
出处
《计算机仿真》
北大核心
2020年第5期173-178,240,共7页
Computer Simulation
基金
南京航空航天大学研究生创新基地(实验室)开放基金(kfjj20170123)
中央高校基本科研业务费专项资金资助
江苏高校优势学科建设工程资助项目。
