热电偶套管流体激励动力特性模拟  

Simulation of fluid excitation dynamic characteristics of thermowell

作　　者：陈庆光[1] 谢滨[1] 贾祥省[1] 张永超[1] 房建成[1] 

机构地区：[1]山东科技大学机械电子工程学院,山东青岛266590

出　　处：《排灌机械工程学报》2013年第4期331-334,共4页Journal of Drainage and Irrigation Machinery Engineering

基　　金：教育部科学技术研究重点项目(209070);山东省"泰山学者"建设工程专项经费资助项目

摘　　要：为减小用于测量管道内流体温度的热电偶套管在高温、高压环境下所受流体高速冲击力,抑制其因流体激励而引起的振动,阐述了流体诱发旋涡脱落导致结构产生振动的机理,分析了热电偶套管断裂的原因,提出了通过在热电偶套管前端安装一流线型挡块以改善套管受力情况的方法,从而预防热电偶套管振动断裂的设计方案.采用大涡模拟(LES)方法分别对有、无流线型挡块情况下的热电偶套管周围的非定常流场进行数值模拟,得到2种情况下热电偶套管表面和流线型挡块上的全压分布、平均作用力以及作用力脉动的时域图和频域图.数值模拟结果表明:安装流线型挡块可以改善热电偶套管的受力情况,防止热电偶套管因流体激振而导致的断裂,使其工作更加可靠.In order to reduce the impact of high velocity fluid in high temperature and under high pressure on thermowells,to suppress the fluid-excited vibration,to elaborate the mechanism of the structure vibration resulted from fluid-excited vortex shedding,and to analyze the reasons that caused the fracture of thermowells,a new design scheme,setting up a streamlined block in front of the thermowell to protect the thermowell from fracture,was proposed.Large eddy simulation（LES） technique was utilized to numerically simulate the unsteady flow-fields around the specified thermowells with and wi-thout the streamlined block respectively.The contours of the total pressures,averaged forces and the pressure fluctuations in time domain and frequency domain on the surface of the thermowell and the streamlined block under the two conditions were obtained.The simulated results show that,the streamlined block can significantly reduce the resultant force acting on the thermowell,suppress the vibration and make the thermowell more reliable.The research provides a new way for optimized structure design of thermowells.

关 键 词：热电偶套管 断裂 流体激励 流线型挡块 大涡模拟 动力特性 

分 类 号：O353.4[理学—流体力学] TH811[理学—力学]