Research on Flow Mechanism of a Centrifugal Compressor with Adjustable Vane Height Diffuser Configuration
The deterioration of the centrifugal impeller/diffuser matching relationship directly limits the stable oper-ating range of a centrifugal compressor.The impeller/diffuser matching relationship and the flow mechanism of a Radiver centrifugal compressor with an adjustable vane height diffuser were investigated with the aid of a calibrated numerical simulation method.The results show that by establishing a positive correlation between the compressor mass flow rate and the optimal diffuser vane height at different working points,the stable working margin of the compressor at small flow points can be improved through actively reducing the diffuser vane height.Under the de-sign speed,the introduction of adjustable vane height diffuser can increase the stable working margin of the cen-trifugal compressor by 18.8%,widen the flow range by 385%and increase the peak efficiency by 0.45%.The ad-justment of diffuser vane height under low mass flow rate conditions can achieve the optimal reconstruction of the vortex system structure inside the channel by improving the attack angle of the incoming flow of the diffuser,and then reduce the low speed area in the suction side and pressure side and hub corner area of the diffuser.After optimi-zation of the diffuser vane height,the impeller/diffuser matching relationship is improved,the occurrence of flow instability inside the diffuser is inhibited,and the aerodynamic performance of the centrifugal compressor is also increased.
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