One-Dimensional Performance Modeling And Variable Geometry Optimization Of Multistage Axial Compressor

One-dimensional performance modeling plays an important role in the quasi-three-dimensional aerodynamic design system of axial compressor.Based on the one-dimensional performance modeling of multistage compressor and its engineering application,an analysis program is established,and then a model calibration procedure and a boundary-layer blockage method are developed.Finally,the variable geometry research is carried out.The research content includes:?.One-dimensional analysis method.The basic principle of mean-line is discussed,and the empirical models about cascade performance,end-wall blockage and surge boundary are summarized to improve the performance analysis program.The performance of four compressors are predicted,and the results verify the accuracy of the program.?.Empirical model calibration method.Since empirical models are not universally applicable to various flow conditions,a model calibration procedure for cascade performance models is developed in the paper.In the method,the key parameters in the models are optimized by the optimization algorithm to reduce the deviation between the predicted performance and the experimental values.Four compressors with different stages and loading levels are selected to verify the calibration method.The results show that the method is effective and general.?.A calculation method of boundary layer blockage based on CFD results.In order to establish an approach to transfer the information of boundary blockage from three-dimensional results to reduced order analysis,a calculation method of boundary blockage based on CFD results is developed.It determines the boundary layer region based on various characteristic parameters.The criteria is tested by extracting the boundary layer in several cases,including a two-dimensional flat plate,compressor endwall and blade surfaces,which proved that the method is effective,?.Compressor variable geometry optimization.A variable geometry method is established based on the mean-line program and genetic algorithm.The optimizations of single-speed and multi-speed are carried out for a six-stage compressor,and the comparison with the experimental scheme illustrates the effectiveness of the method.The research improves the mean-line analysis method of axial compressor and provides a reliable technical support for the determination of variable geometry scheme.