Analysis Of Internal Flow Characteristics Of High Temperature Liquid Heavy Metal Main Circulation Pump In Offshore Floating Nuclear Power Plants

In today's world,energy development takes sustainable development as its purpose and vigorously develops green new energy.As the fourth-generation nuclear power reactor with the most development potential,the lead-based nuclear reactor has the advantages of sustainability,economy,safety and reliability,as well as nonproliferation and physical protection.Countries around the world have invested a lot of energy in the research of the fourth generation nuclear power reactors.Although the current offshore mobile nuclear power plant program fully meets the safety requirements of the third generation of nuclear power and meets the current energy needs.However,the fourth-generation nuclear power reactor technology,as the current mainstream development direction of nuclear power technology,tends to be small and modular,and is very suitable for offshore floating nuclear power plant solutions.There is still no relevant national report.Therefore,it is of great significance to carry out research on the application of the fourth-generation nuclear power reactor technology to the scheme of offshore mobile nuclear power plants.This topic is supported by the key R & D projects in Jiangsu Province.In this paper,the main circulation pump of the primary loop of the offshore nuclear power reactor,the high-temperature liquid heavy metal main circulation pump,is the main research object.Use a combination of numerical calculation and experimental verification.The internal flow mechanism of the high temperature liquid heavy metal main circulation pump under steady state conditions was explored.The stability of the main circulating pump for high temperature liquid heavy metals under ocean conditions is analyzed.It provides a reference for the design and manufacture of the main circulation pump of the primary circuit of the offshore nuclear power reactor.The main research contents are:(1)Based on the fluid-solid thermal coupling theory,and after hydraulic optimization,the calculation model of the high-temperature liquid heavy metal main circulation pump was established.At the same time,the relevant test bench was built to compare and verify the test results with numerical simulation.The influence of the steady-state operating conditions at different temperature conditions on the hydraulic characteristics of the high-temperature liquid heavy metal main circulation pump is analyzed.The law of stress distribution and deformation of rotor components is revealed.The strength of the rotor components of the high temperature liquid heavy metal main circulation pump was checked.(2)The high temperature liquid heavy metal main circulation pump was calculated with an indefinite constant value when the operating temperature was 773 K,and the variation law of pressure pulsation in the flow channel was explored.The effect of different flow conditions on the pressure pulsation in the main circulating pump of hightemperature liquid heavy metals is analyzed.(3)Based on the theory of marine motion,a model of ocean undulating motion of a high-temperature liquid heavy metal main circulation pump was established,and the performance of the high-temperature liquid heavy metal main circulation pump under undulating conditions was analyzed.The internal flow mechanism of the main circulating pump for high temperature liquid heavy metals under marine conditions is revealed.The stability of the main pump of high temperature liquid heavy metal nuclear under marine conditions was explored.Provide a basis for the subsequent research on the safety of offshore nuclear power reactors.(4)Under the premise of considering the gravity of the medium,based on the existing physical properties of the liquid metal melt,a variety of medium physical properties calculation schemes are set up to numerically calculate the main hightemperature liquid heavy metal circulating pump at sea.The effects of medium viscosity and medium density on the external characteristics of high-temperature liquid heavy metal pumps were explored.Further provide a reference for the design of offshore high temperature liquid heavy metal pumps.