Abstract
Currently, methods of numerical modelling are widely used. They are especially widely used in the design of turbo compressors. For the specific task of designing new flowing parts of a centrifugal compressor, it is not recommended to deviate from the canonical design techniques, but it is preferable to supplement them with numerical methods. This article is devoted to the end two-element stage investigation of a centrifugal compressor with an axial radial impeller; the stage main dimensions were obtained using the method of V.F. Rice. In order to obtain the necessary pressure characteristics and determine the dependence for the absolute velocity non-uniform distribution at the inlet to the axial radial impeller, the flow path main dimensions were optimized using numerical calculation methods. The calculation was performed using the SST turbulence model using computational gas dynamics methods in the ANSYS CFX software environment. Based on the optimization results, five compressor designs and corresponding characteristics were obtained. The absolute velocity distribution nature at the inlet to the centrifugal compressor axial radial impeller for five flow path variants is investigated. Empirical dependences are obtained for the deviation of the absolute velocity at the inlet in the hub section axial radial impeller and the absolute velocity deviation at the shroud from the absolute velocity at the average diameter based on the results of a numerical experiment. Recommendations are made for further absolute velocity distributions investigating at the inlet to the compressor impeller.
Highlights
The gas industry is one of the leading fuel and energy complex sectors
To reduce financial costs, it is necessary to increase the efficiency of compressors, which means to create the optimal machine flow path shape
The boundary conditions for the objective were adopted on the basis of existing recommendations for the problems of three-dimensional design of two-element stages with axial radial axis [5,6,7,18,19,20]
Summary
Technical progress and the country national economy development pace depend on its condition. This industry is one of the most important applications of centrifugal compressors [1,2,3,4 etc.]. In connection with the growth of requirements [2] for modern centrifugal compressors, both in terms of required pressure and energy efficiency, the need for the production of highly efficient axial radial impellers is increasing. This article continues the designed stage investigation under various working conditions by numerical calculation methods, which was begun in [5].
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