Optimization Design Of Components Of Gas Turbine Based On Kriging Surrogate Model

As the complexity of the industrial equipment increase subsequently along with the development of human industrial system, optimization design methods based on fine model with detailed information developed for components of simple structure are difficult to achieve. Therefore, it is necessary to use surrogate model to simplify the process of optimization design. In this dissertation, optimization design method based on Kriging surrogate model and corresponding updating technique for increasing accuracy of the surrogate model are studied for design of components of new type of gas turbine. Automatic process of optimization design based on surrogate model of single fitting and/or sequence update fitting is given and applied in geometry optimization design of rotor and compressor vane carrier of gas turbine.The main work of this dissertation includes the following three parts:(1) Automatic process of optimization design based on surrogate model of single fitting and/or sequence update fitting is presented and implemented on the platform of iSIGHT. Four standard test functions are considered to verify its accuracy.(2) To reduce the stress concentration and tilt of rotor of gas turbine, a optimal design of geometrical size of rotor is given by using the automatic process of optimization design based on surrogate model. The efficiency and accuracy of optimization design based on surrogate model are confirmed by comparing optimization results with which of optimization design based on classical model with detailed information.(3) Four different finite element models are constructed to simulate the ovalization of compressor vane carrier of gas turbine under the effect of thermal coupling according to different structure models and contact types, then compare the analysis results to determine the design model. Optimal design of flange size and thickness of compressor vane carrier is completed by using the optimization design method based on Kriging surrogate model.This method is generic and can be applied in complicated engineering problems.