Design method of a volute

Abstract

The invention discloses a design method of a volute, and aims to provide a design method of molded lines of a spiral section and a diffusion section of the volute based on a space vector so as to improve the design precision and the aerodynamic performance. The design of the spiral section molded line of the volute comprises the steps that the starting section azimuth angle of the volute is calculated according to given volute inlet section flow parameters and volute design geometric parameters; the radius of a volute section circle corresponding to the range of the azimuth angle of the volutesection is calculated, wherein the range of the azimuth angle of the volute section corresponds to the radius of the volute section circle; a volute section circle radius corresponding to the range of the azimuth angle of the volute section is calculated, wherein the range of the azimuth angle of the volute section is as shown in the specification; Taking the union set to obtain a set of corresponding volute section circle radiuses in the range of the volute section azimuth angle (shown in the specification); And according to the space coordinate parameter equation of the section circle at any volute section azimuth angle, the space coordinate of the section circle at any volute section azimuth angle is calculated to obtain the volute spiral section section circle space molded line. The method is a more accurate volute design and modeling method, and is beneficial to improving the aerodynamic performance of equipment.

Description

technical field [0001] The invention relates to the technical field of design of flow-passing components of centrifugal and mixed-flow rotating machines, and more specifically relates to a design method of a volute. Background technique [0002] Among the flow parts, the main function of the volute is to collect the diffused fluid and guide it to the following equipment. Volutes are widely used in centrifugal and mixed-flow rotating machinery, such as water pumps, centrifugal compressors, etc. Centrifugal compressors are widely used in aero-engines, ground gas turbines, automobile and ship turbochargers, petrochemical compressors, and play an irreplaceable role in the fields of national defense and civil industry. The volute is one of the core components of the centrifugal compressor. Its important function is to collect the gas behind the diffuser or impeller and lead it to the gas pipeline or cooler behind the compressor. The profile design of the volute mainly includes ...

AI Technical Summary

Problems solved by technology

Since the section circle of the spiral section of the volute is not a complete circle, if it is simply regarded as a complete circle, there will be a certain deviation, especially when the section circle of the volute is close to the position of the volute tongue, the calculation results will deviate significantly plan for design

In addition, the design method that only calculates the variation law of the shape line of the spiral section of the volute and the diffuser section with the azimuth angle leads to a certain deviation between the modeling result and the design result, which will cause the flow area of ​​the design plan to be smaller than the actual required flow area, and thus As a result, the gas in the volute accelerates, the flow loss increases, and the stable operating range of the compressor decreases

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