Dynamic Characteristics And Numerical Simulation Of Suspension Liquid Storage Engineering Structure

With the aggravation of the global environmental pollution,the use of clean energy has been paid more and more attention to by the people of the world.As one of the clean energy sources,nuclear power has played an important role in many national power generation projects and the scientists of the world have never interrupted the research work on nuclear power technology.In March 2011,the Fukushima nuclear accident happened in Japan,prompting nuclear researchers to accelerate the pace of nuclear power research.At present,the mainstream nuclear power in the world is the third-generation nuclear power reactor,but the fourthgeneration nuclear power reactor is being actively popularized.Such as VHTR(sodium-cooled fast reactor),SCWR(super-critical water-cooled reactor),GFR(gas-cooled fast reactor),SFR(sodium-cooled fast reactor)and LFR(lead-cooled fast reactor).In the fourth-generation nuclear power system,the promising lead alloy cooling reactor system has excellent inherent and passive safety.The Lead alloy cooling Fast Reactor coolant generally uses lead bismuth alloy,the metal molten liquid of which will produce violent sloshing in the earthquake,causing potential an adverse effects on the main vessel.Therefore,it is of great theoretical and engineering significance to study the dynamic characteristics of the main vessel of the lead based reactor.In this paper,the lead based reactor main container in foreign references is taken as the research object and the large commercial software ANSYS is used as the platform.The dynamic characteristics of the main vessel are calculated under the consideration of the seismic fluidsolid coupling.Meanwhile,the influence factors of the sloshing height of the free liquid surface and the dynamic characteristics of the main vessel are also studied.Based on the Visual Studio 2012 platform,the finite element software that equivalently discretizes the numerical model was developed.The correctness of the software was verified by the comparison with SBFEM and Housner theory.The main contents are as follows:(1)A finite element model for calculating sloshing of liquid is proposed,and based on SBFEM and Housner theory,the correctness of the ANSYS model is verified.(2)The main vessel is a liquid storage structure in irregular shape and the constraint is in the form of suspension system.Based on ANSYS,the liquid sloshing characteristics and seismic responses of the bulk liquid storage structure considering the structure-foundation interaction are calculated.The influence of internal liquid on the dynamic characteristics of the main vessel under different density conditions was studied.And the influence of liquid viscosity and internal components on the sloshing characteristics of the liquid is discussed.(3)The equivalent discrete model is studied and analyzed,the haracteristics of the equivalent additional mass at different water heights were obtained.The finite element software for calculating the additional mass was developed.The software results are verified using SBFEM.(4)The viscoelastic artificial boundary was used to simulate the infinite domain of the foundation.The dynamic characteristics of the viscoelastic artificial boundary model were analyzed.