Research On Force And Vibration Of The Gas Turbine Rotor Under The Different Conditions Of Axial Flow Compressor

Gas turbine as new generating units, the proportion of it in our country is rising year by year. However, the development of gas turbine technology in our country is very slow. This article topic selected based on this environment, and the separation situation of gas turbine structure and fluid research in the domestic. It aimed to make up the blank of the association studies, and laid the foundation for subsequent research of the gas turbine shafting.This article used the Pro/E to make the model, then simplified analyzed the work condition of the axial compressor. The exciting force of stall has been analyzed. The research contents and results as follow:(1) The structure and working principle of axial flow compressor are analyzed, the formulas have been showed that the axial flow compressor works mainly include the changes of gas kinetic energy and the internal pressure potential energy. If part of the rotating stall occurs, the tangential excitation force will effect on the rotor at a certain frequency.(2) Flow-total pressure characteristic of the compressor is obtained through the simulation, then this paper simulate the different work condition of axial flow compressor, the results show that: In normal condition, only the balance force and moment acted on the rotor, and the resultant force and moment is proportional to the force acted on the blade of rotor. Tangential force and moment have the same change trend with the flow rate, but the axial force in contrast. The axial force, torque and tangential force increased by the increasing of rotational speed. With the increasing of total pressure, the axial force increased in linear, torque and the tangential force maintain at a certain level.(3) This chapter started from the axial flow compressor stall classification, then simulated the process of stall and obtained the stall date. The analyses show that: the forces acted on the blade mutate in the initial stage of stall, and the frequency of force equal to the stall spread speed. The stall spread speed is 30 to 50 percent of the rotor speed, and the vibration frequency include the blade passing frequency, stall frequency and other multiple frequency components.(4) This chapter analyzed the rotating structure and vibration. The blade equivalent stress and strain is larger at the blade root, and the intermediate position of the blade leading edge and the blade root place need to be paid more attention. When the moment acted on rotor, the stress strain and deformation values are contrary. And the rotor vibrated in a stall spread frequency, when the excitation force of stall acted on it.