Matching characteristics of the front and rear profile positions in an axial flow compressor tandem cascade
The matching characteristics of the front and rear profile positions of a highly loaded tandem cascade of axial flow compressors were studied with a combination of numerical and experimental methods.The effects of the percent pitch and axial overlap on the cascade performance and the relevant mechanisms were analyzed in detail.The results show that the influence of percent pitch on the cascade performance is more significant than that of axial overlap,and the sensitivity of cascade performance to the percent pitch and axial overlap is extremely low within the optimal design space of percent pitch.The increasing of percent pitch improves the convergence of the slotted passage and the acceleration ratio of the slot jet and changes the flow characteristics near the front blade pressure surface near the trailing edge and the rear blade suction surface near the trailing edge,which increases the load at the trailing edge of the front blade and decreases the load and incidence angle at the leading edge of the rear blade,thereby weakening the suction surface separation of the rear blade.When the percent pitch is increased to the condition of slot passage closure,the significant decrease in the momentum of the slot jet leads to a sharp increase of the separation loss.Finally,the reliability of some numerical simulation results is verified by the cascade wind tunnel experiment.
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