Abstract
The article presents results of applying the methods of computational fluid dynamics for model low-flow rate stages of centrifugal compressors with flow rate coefficient F = 0.028. The computational domain of a model centrifugal compressor for CFD-simulation consists of the following elements: inlet chamber, impeller, vaneless diffuser, return channel, outlet chamber, shaft seal labyrinth, front and back shroud leakage. Full-scale experimental studies were conducted to model stage 028 in air at an inlet pressure of p* = 1 atm. Numerical research for stage 028 held with flow rate coefficient F=(0.019-0.046) for three variants trailing edge of the impeller. According to the results of numerical research are constructed performances of stages centrifugal compressor and conducted verification of results. Estimated discrepancy between the results of numerical researches on the model with shaft seal labyrinth and without shaft seal labyrinth.
Highlights
Centrifugal compressors have found the widest application in modern power engineering [1,2,3,4,5,6,8,9]
A significant amount of energy is required for the actuator of gas compressor unit (GCU)
Numerical calculation of the three versions of the output edge of the blades of the impeller showed a qualitative and quantitative result corresponding to the model tests and theoretical concepts of the flow pattern in the flowing part of the PCC
Summary
Centrifugal compressors have found the widest application in modern power engineering [1,2,3,4,5,6,8,9]. Centrifugal compressors are the main gas compression equipment in modern gas transmission networks. High efficiency of industrial centrifugal compressors (ICC), which are part of the GCU, is determined by the degree of gas-dynamic perfection of the flowing part, namely by choosing the optimal shape of the flowing part for operating conditions. The gas-dynamic design of the ICC should correspond to high efficiency indices, and to have a sufficiently wide area of stable operation, with a significant margin from the left boundary side of the characteristic, i.e. margin from surging [10,11,12,13,14,15,16,17,18,19,20]
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