Abstract
The paper presents the results of CFD-calculations of a centrifugal compressor stage with a high-pressure 3D impeller and a vaneless diffuser. The stage was designed by Prof. A. M. Simonov in the Problem Laboratory of Compressor LPI according to the following design parameters: flow rate coefficient 0.080, loading factor 0.74, and the relative Mach number 0.78. Two design grids were used: 2.4 and 4.4 million cells for the sector with one blade. The entire stage was calculated with a sparser grid. Special “Stage” interface conditions are used to interface the gas-dynamic parameters at the boundary regions. The SST turbulence model was used in the calculations. The results of efficiency characteristics and work coefficient comparison showed the following: in design flow rate all three variants of the calculation overstate the loading factor by 14.3%; the calculated characteristics of polytrophic work coefficient in the staging of 360 degrees are closest to the experimental characteristics, but the absolute value is greater than 12% at a flow rate coefficient of 0.085; the maximum calculated efficiency of a stage (the circle of 360 degrees) is almost equal to the measured maximum efficiency.
Highlights
The total power of centrifugal compressors in the industry of the Russian Federation accounts for tens of millions kW
The unit capacity of industrial centrifugal compressors is measured in thousands of kW, which is why many compressors are produced according to individual projects
"Gas Dynamics of Turbo Machines" laboratory of the Joint Science and Technology Institute with the participation of the Institute of Advanced Manufacturing Technologies improves its own engineering methods for optimal gasdynamic design and carries out projects assigned by constructors of compressors [1, 2, 3, 4, 5, 6]
Summary
The total power of centrifugal compressors in the industry of the Russian Federation accounts for tens of millions kW (the gas industry of the Russian Federation alone has approximately 55 million kW). The unit capacity of industrial centrifugal compressors is measured in thousands of kW (up to 32 thousand kW or more for compressors of the gas industry), which is why many compressors are produced according to individual projects. "Gas Dynamics of Turbo Machines" laboratory of the Joint Science and Technology Institute with the participation of the Institute of Advanced Manufacturing Technologies improves its own engineering methods for optimal gasdynamic design and carries out projects assigned by constructors of compressors [1, 2, 3, 4, 5, 6]. The modern gas-dynamic project is based on a certain way of summarising the experiments and is conducted in the following order:
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