Analysis of Vibration Characteristics of Main Vessel Affected by LBE with Different Temperatures
The vibration characteristics of lead-based fast reactor main vessel in air and lead-bismuth eutectic medium at different temperatures are studied by means of fluid-structure coupling and ANSYS software.Solid modeling is used for the main vessel,and the FLUID30 unit is used to simulate the fluid of lead-bismuth eutectic medium.The effect of additional mass of lead-bismuth eutectic medium on the vibration characteristics of the main vessel is considered.The results show that the first six modes of the two models are first-order beam mode and low-order shell mode.Because of the difference of the constraints of the two models,the order of the modes is different.Compared with that in the air,the first six order modes in the lead-bismuth eutectic environment did not show higher order modes.However,due to the influence of added mass,the calculated values of each order frequency decreased significantly by about 80%,which is accompanied by the phenomenon of mode exchange.With the increase of temperature,the frequency of each mode of the main vessel shows a decreasing trend.When the temperature increased from 150℃to 390℃,the frequency decreased by about 27.3%.
fluid-structure couplinglead-bismuth eutecticmain vessellead-based fast reactorfinite element
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