燃气轮机转子系统工程等效约化建模与缩比试验验证

Gas turbines have important applications in the fields of industrial power generation, aviation and navigation, and national defense equipment. As one of the core components of gas turbines, the rotor system directly affects the performance, reliability, and service life of the whole machine. The use of equivalent models of gas turbine shaft systems can accelerate the dynamic solution process. An engineering equivalent reduced modeling method for gas turbine rotor systems was proposed in this article based on strain energy equivalence theory, combining similar design theory to obtain a scaled rotor model with similar dynamic characteristics to the prototype. The modal characteristics of the shaft system were calculated and dynamic acceleration tests were carried out to verify the accuracy of the engineering equivalent reduced modeling method. The results indicate that the deviation of the first three natural frequencies of the established engineering equivalent model from the prototype is less than 3.71%, and the deviation of the first two critical speeds is less than 3.8%. The proposed rotor engineering equivalent modeling method has broad application prospects in the dynamic design of new gas turbine structures.