Aerodynamic Design And Numerical Research Of Low-Speed Model Compressor For Highly Loaded Compressor

Nowadays,the low-speed model technology has been one of the main methods to study rear stages of the highly loaded compressor.But till now the design research carried out around this field in China is still scarce,which is needed to be more standard and normalizable in order to develop a precise aerodynamic design theory of a large-scale axial-flow low-speed model compressor.The key of low-speed model compressor aerodynamic design is to choose the accurate “modeling principles” parameters,which can achieve the high-low speed flow field similarity transformation.In China,the TT-pressure coefficient is widely used as the key parameter of “modeling principles” in the low-speed model compressor design,but it results in the question that high-low speed compressor rotor diffusion and stator diffusion have large deviations.The “modeling principles” parameters is based on the experience.After a detailed analysis of the reserach experience from domestic and foreign counterpart,the new pressure coefficient has been defined to evaluate the compressor aerodynamic load.In this way,the result of high-low speed compressor aerodynamic parameters such as rotor diffusion and stator diffusion is more accordant.In the design of the low-speed compressor blade profile and S1 stream surface,by using the blade surface non-dimensional constant entropy velocity coefficient,the blade surface aerodynamic parameters are studied,to verify the consistency of the the non-dimensional velocity distributionC_V and the non-dimensional pressure distributionC_P.Besides,the characters of the attack angle and backward angle are studied.The low-speed compressor blade profile design is more standard and normalizable.Based on the more accurate “modeling principles” parameters,the aerodynamic design of a four repeating stage low-speed model compressor for a rear stage of one highly loaded compressor has been accomplished and the full three-dimensional numerical simulation is also finished,with a good design result.The difference of 3D flow calculations,S2 stream surface design and S1 stream surface design are compared and analyzed.And the awareness about the disparity of compressor design is enhanced.