Метод расчетно-теоретического исследования структуры течения и характеристик ступеней центробежных нагнетателей

Abstract

Thesis for scientific degree of the Candidate of Sciences (Engineering) on the special-ty 05.05.16 – Turbomachinery and Turboplants. – National Technical University "Kharkiv Politechnical Institute", Kharkov, 2015. The calculation and theoretical studies method of flow structure and characteristics of centrifugal blowers stages with impellers radial vanes was created. It allows determining summary characteristics and 2D flow structure of flow path including blade-to-blade channels in wide range of working regimes. To account for viscous effects generalized semiempirical dependences for centrifugal blowers were used. The proposed method allows taking into account the geometric features of radial impeller with blades that formed by cylindrical and conical surfaces, vaneless and vaned diffusers, reverse guide vanes and gas-path curvilinear contours. The software package AxCB was developed, which allows carrying out the verification of the calculation method. It showed satisfactory accuracy of flow numerical investigation results in the stages with experimental and analytical data. With the proposed method and software package AxCB studies were undertook which dealt with influence of different geometric parameters of flow path and blade rows on the flow structure and stages summary characteristics. On the basis of a detailed analysis modernization of three centrifugal blower stages was proposed to improve their basic parameters or expand the characteristic working area.