Keywords
compressor
collector
How to Cite
Abstract
In many designs of a single-stage radial and axial-centrifugal compressors of the turboprop and turboshaft aviation engines, a properly formed collector placed after a vaneless or vaned radial diffuser, is used to decrease velocity and to increase static pressure of an air stream. The spiral diffuser is one of the main diffuser types. A volute is a channel with a different form of transverse sections that gradually expands in the direction of rotor rotation and includes preceding diffuser with a cylindrical inlet hole. Its geometrical parameters should be properly selected to ensure the correct operation of the scroll. This paper presents two main methods of calculation of geometrical parameters of the spiral diffuser: free vortex design (constant angular momentum principle) and constant mean velocity design. Mentioned methods (recommended for use in the conceptual design of a compressor) are based on energy equation - steady flow energy equation, equation of continuity, first law of thermodynamics, Euler’s moment of momentum equation, gas dynamics functions and definitions used in theory of turbomachinery. A detailed analysis of geometrical parameters of different types of collectors were conducted. This paper also provides a review of experimental research results of total pressure loss coefficient in the volute and proposed method of determining air stream parameters at volute outlet.
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