Design And Research On Gas Drive System Of Turbine Rotor Dynamic Balancing Machine

With the increasing popularity of household cars in the family,the number of vehicles using turbocharger is also increasing;the dynamic balance performance of turbine rotor is one of the influencing factors of whether the turbocharger has good working performance.In this paper,a gas drive system based on turbine rotor dynamic balancing machine is designed,which provides a new drive mode for turbine rotor dynamic balancing measurement to improve the dynamic balancing accuracy.Its advantages are simple structure,single-stage transmission and low power consumption.In order to explore the influence of gas drive system on dynamic balance measurement,the relationship between vibration and speed is analyzed based on dynamic balance theory,and the relationship between flow and speed is deduced,and the influence of resistance is analyzed.According to the whole design thought of the drive system,and according to the structural design requirements and criteria,the structural parameters of the turbine housing,such as the clearance and overall size of the wheel housing,are calculated and analyzed;Gas nozzles of turbine housing are the key to control rotor rotation.The number and placement of nozzles are analyzed and determined.Then,through simulation verification,the structural dimension parameters of the area of the exit orifice and incidence Angle are obtained,and the structural dimension design scheme of the drive system is established.The CFD software ANSYS CFX was used to simulate and analyze the flow field model of the flow passage between the impeller and the nozzle,to predict the actual flow pattern,and to establish and analyze diagrams of velocity vectors,velocity vector graphs and nephograms of the internal flow passage.In addition,the unsteady simulation calculation was carried out based on the steady-state calculation results,and the time-varying curves of the force on different coordinate axes and the variation frequency of the airflow’s force on the turbine rotor were obtained,which verified the rationality of the structural scheme of the driving system.The relationship between the actual flow rate and the speed of the gas drive system of the turbine rotor dynamic balancing machine is analyzed on the developed experimental device,the speed fluctuation and the measurement accuracy of the two driving methods are compared.The experimental results show that the gas drive system of the turbine rotor dynamic balancing machine meets the actual dynamic balancing drive requirements,improves the measurement accuracy,and has good practical application value,which provides a reference for the related design and research.