期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2012
卷号：15
期号：6
出版社：IOP Publishing
摘要：Thermowells are process-critical devices that protect thermometers which are used to measure the fluid temperature in a pipe from harsh ind ustrial fluids. In practical applications, thermowells are often fractured due to the impact of the fluid flow with high velocity and high temperature. It has been proved both theoretically and practically that the main reasons of thermowells damage lie in heavy loads and periodic forces caused by vortex flow, which could excite the vibration of the thermowell, leading to resonance and damage. An improved scheme is put forward in this paper to reduce the fluid load acting on the thermowell and suppress the structural resonance b y setting up an interference device in front of the thermowell. The unstead y internal pipe flow-fields around the specified thermowells are simulated, respectively, with and without an interference device by using LES technique. The force and the vibration of the thermowells induced by the unsteady flow are analyzed. The effectiveness of the interference device in protecting thermowells is verified by comparisons of the simulated results under the above two conditions. It shows that the interference device can effectivel y suppress the vibration and reduce the resultant force of the thermowell
