Coupling Analysis Of High Speed Rotor With Multiple Cracks In Flow Field

In the field of nuclear industry,rotating machinery in the nuclear industry is a very important equipment.The core components ofthe rotating machinery are high-speed rotating rotor systems whose safety is of paramount importance.Butthe rotor system works in high temperature,high radioactive environment,the emergence of cracks is inevitable.Therefore,it is very important to analyze the high-speed rotor with multiple cracks.Somerotor components are rotating at high speed in vacuum.Due to failure and other reasons,the shell is damaged,so the outside air will enter the rotating machinery to form an air flow field around the rotor.Therefore,we must consider the fluid-structure interaction between the air and the rotor.Fluid-structure interaction affects the dynamic behavior of the rotor system,especially at high speeds.This paper took the rotor system as the research object and built the model using ANSYS Workbench and FLUENT finite element software.According to the actual situation,numerical simulation is carried out on the crack on it in both cases with or without fluid-structure interaction.This paper studyed the influence of speed changes,temperature changes,the number of cracks on the stress intensity factor.The results show that increasing the rotating speed of the rotor increases the strain of the rotor,the stress intensity factor of the crack and decreases the equivalent stress.However,the reduction in the equivalent stress is very small.Increasing the rotor temperature will increase the strain of the rotor,the equivalent stress and reduces the stress intensity factor.The fluid-structure interaction increases the stress intensity factor of the crack,but the magnitude of the increase is very small.The stress intensity factor of each crack of multi-cracked rotor is smaller than the stress intensity factor of single-cracked rotor.That is,the greater the number of cracks,the smaller the stress intensity factor.