Abstract
This paper provides the results of the study of a spatial flow in a low-flow stage of a SVD-22 centrifugal compressor of computational fluid dynamics methods using the Ansys CFX 14.0 software package. Low flow stages are used as the last stages of multistage centrifugal compressors. Such multistage compressors are widely used in boosting compressor stations for natural gas, in chemical industries. The flow features in low-flow stages require independent research. This is due to the fact that the developed techniques for designing centrifugal compressor stages are created for medium-flow and high-flow stages and do not apply to low-flow stages. Generally at manufacturing new centrifugal compressors, it is impossible to make a control measurement of the parameters of the working process inside the flow path elements. Computational fluid dynamics methods are widely used to overcome this difficulties. However verification and validation of CFD methods are necessary for accurate modeling of the workflow. All calculations were conducted on one of the SPbPU clusters. Parameters of one cluster node: AMD Opteron 280 2 cores, 8GB RAM. The calculations were conducted using 4 nodes (HP MPI Distributed Parallel startup type) with their full load by parallelizing processes on each node.
Highlights
The object of the study is an intermediate low-flow stage SVD-22, intended for operation in centrifugal compressors of high and ultra-high pressure
Diffuser width b3 = 5.3 mm, the working fluid is "Air Ideal Gas", Pin = 1 atm, the stage was counted with seals; 4
Diffuser width b3 = 6.8 mm, the working fluid is "Air Ideal Gas", Pin = 1 atm, the stage was counted with seals; 5
Summary
The object of the study is an intermediate low-flow stage SVD-22, intended for operation in centrifugal compressors of high and ultra-high pressure (injection of natural gas into underground storage, chemical production, etc.). The stage was designed and a natural experiment was carried out for it by the scientific group of prof. L. Ya. Strizhak (Department of Compressor, Vacuum and Refrigeration Engineering (CVRE) SPbSPU) [1,2,3] The peculiarities of this type of steps are channels of small width, which is why boundary layers at the surfaces of the flow path have a significant effect on the flow and characteristics of the steps , gas leaks and leaks through labyrinth seals. There are known works with simplified modeling of flow in seals and gaps in other software packages, in which the flow is modeled according to predetermined empirical characteristics, significantly reducing the accuracy of calculations
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