Influence Law of Geometric Parameters and Performance Optimization of Centrifugal Compressor
Taking a centrifugal compressor with a wedge-shaped diffuser as the research object,the CFD numerical simulation method was used to study the influence law of typical geometric parameters of the impeller on the performance of the centrifugal compressor and conduct parameter sensitivity analysis.Considering the values of typical geometric parameters,the aerodynamic performance of the compressor was optimized.Research has shown that appropriately reducing the inlet-outlet radius ratio,relative outlet width,and relative length of splitter blades,as well as selecting the appropriate blade inlet angle and out-let back bend angle,are beneficial for improving aerodynamic performance.The degree of influence of geometric parameters on pressure ratio is ranked as follows:relative length of splitter blades,outlet back bend angle,inlet-outlet radius ratio,blade inlet angle and relative outlet width;the degree of influence of geometric parameters on efficiency is ranked as follows:relative outlet width,relative length of splitter blades,blade inlet angle,outlet back bend angle and inlet-outlet radius ratio.The changes in geometric parameters,except for the relative outlet width,have a greater impact on pressure ratio than on efficien-cy.The optimized centrifugal compressor has expanded its stable operating range,with significant im-provements in pressure ratio and efficiency.The pressure ratio at the design flow rate has been increased from 5.074 to 5.198,and the efficiency from 0.822 6 to 0.842 7.
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