Research On Dynamic Balancing Technology Of Turbopump Rotor And Application Of Honeycomb Seal In Steam Turbine

With the rapid development of modern aerospace technology,the requirements for the stability of the rocket engine are further improved.The dynamic balance of the turbopump rotor is a key factor affecting the stability of the rocket engine.In the petrochemical industry,due to the seal failure of the steam turbine,the unit had to be shut down for maintenance,which seriously affected the safety and stability of the unit.Aiming at the problem of dynamic balance of turbopump rotor components,this paper simulates and analyzes the influencing factors of the initial imbalance of turbopump rotor;researched the turbopump rotor dynamic balance deweighting technology based on ultrafast lase;the calculation method for the conversion of "points"and "surfaces" of turbopump rotor weight removal is proposed;for the problem of excessive leakage of steam turbine seals,honeycomb sealing technology was applied,and honeycomb seal simulation analysis and application modification were carried out on steam turbine seals;aimed at the rub-impact vibration failure of the cantilever rotor,a comparison experiment between integral squeeze film damper(ISFDfor short)and rigid support was carried out.,and the control effect of ISFD on the rub-impact vibration of the cantilever rotor was studied.The main research contents of this paper are as follows:(1)Used finite element software,the effects of assembly coaxiality and perpendicularity deviation of turbopump rotor assembly,shaft hole machining coaxiality deviation and blade material unevenness on the initial imbalance of turbopump rotor assembly were calculated.(2)The ultra-fast laser metal de-weighting technology was studied;based on the special de-weighting surface shape of the turbo pump turbine disk,the finite element software was used to calculate the stress-response of the de-duplication shape,depth and edge chamfering of the de-duplication to the stress of the turbine disk;the numerical calculation method of "point" and"surface" transformation based on laser metal processing to remove heavy surface was studied.(3)Designed a turbopump rotor ultrafast laser deweighting test bench;the de-weighting effect of ultra-fast laser processing round,square and arc-shaped de-duplication surfaces was experimentally studied,and the edge chamfering processing experiment was also carried out.The experimental results show that the ultrafast laser metal processing technology can meet the technical requirements of turbopump rotor deweighting.(4)Through simulation analysis,the sealing characteristics of comb-tooth seal and honeycomb seal wer compared.The effects of comb-tooth structure,honeycomb core cell depth and honeycomb core cell diameter on the sealing performance were studied,and the factors affecting the sealing characteristics of honeycomb seal were explored According to the simulation results,the engineering technology transformation was carried out.After the transformation,the monitoring temperature of the radial bush of the steam turbine was reduced by 20℃.(5)The effect of the integral squeeze film damper on the rub-impact vibration of the cantilever rotor under different rotation speeds,different imbalances and different rub-impact positions was experimentally studied.The results show that the integral squeeze film damper has a certain inhibitory effect on the rubbing vibration of the cantilever rotor,and the maximum vibration reduction was 40.8%.