METHOD OF PROFILING THE ELEMENTS OF THE FLOWING PART OF THE BLADE MACHINE Russian patent published in 2020 - IPC F04D29/24 F04D29/42 

FIELD: machine building.

SUBSTANCE: method of profiling elements of a flow part of a blade machine relates to machine building and can be used in systems for computer-aided design of vane machines for pumping of liquid or gas at rotor speed n of a blade machine. Method consists in determining the shape of elements of a flow part of a blade machine, which outer outlines are represented by curves, at which determining functional dependence between geometric and kinematic parameters, curves of outer contours of elements of flow part of blade machine are represented by envelopes of family of circles, centers of which are located at middle line of current. Desired shape of the envelopes is determined based on values of the generalized structural parameter, iteratively changing the geometry of the middle current line. Equation of generalized structural parameter is specified. Main geometric parameters of the flow part elements are calculated and the functional dependence of the flow area on the length of the middle current line is determined, which ensures the nonstall irrotational flow throughout the flow part. Medium current line is constructed using Bezier polynomial to fix initial reference vertex. Extreme support vertex has one degree of freedom, and the intermediate support vertices have two degrees of freedom. Then coordinates of points of envelopes of family of circles are discretely calculated, external outlines of flow part elements are built by interpolation of points by Bezier splines, generalized structural parameter is calculated and coefficients of Bezier polynomial coefficients of the average current line are corrected. Determination of main geometrical parameters of flow part elements is performed using systematics equations.

EFFECT: reduced methodical error and expanded functional capabilities by taking into account structural and cavitation limitations.

1 cl, 1 dwg