Influence of the design parameters and dimensions on the stationary elements efficiency in the centrifugal compressors

Object of the study includes stationary elements of the intermediate type stages consisting of a vaneless diffuser and the reverse guide vane. It is known that the CFD computation of a vaneless diffuser could be efficiently used in the design and development. CFD optimization results with regard to a reverse guide vane are confirmed experimentally. The paper uses in computation the universal simulation method, where the flow part shape is determined by the two main design parameters, i.e. the flow rate and pressure coefficients. Optimization and computation in the ANSYS CFX software package are used to study the stationary elements with the flow rate of 0.015 ... 0.150 and the pressure coefficient of 0.45 ... 0.70. The paper provides efficiency characteristics of the optimized stationary elements and determines the design parameters influence on the design mode efficiency. The inlet angle of blades of the optimized reverse guide vanes, especially in the low-flow stages (flow rate coefficient of less than 0.040), is significantly smaller than that of the known analogs. The flow structure in the optimized reverse guide vanes of the low-flow stages is not favorable enough (significant separation zones are observed on the blades). Studying stationary elements of the low-flow stages would be continued. If the results are confirmed experimentally, the stationary elements design would become more reliable, and efficiency of the intermediate stages would increase.
EDN: FGYHZN, https://elibrary/fgyhzn

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