No 3 (2020) Technical mechanics
Technical mechanics, 2020, 3, 12 - 17
ON THE EFFECT OF THE MERIDIONAL CONTOUR SHAPE ON THE POWER CHARACTERISTICS OF A CENTRIFUGAL COMPRESSOR WHEEL
Kvasha Yu. A., Zinevych N. A.
Kvasha Yu. A.
This work is concerned with the development of approaches to the optimal aerodynamic design of
centrifugal compressor wheels, which is due to the use of centrifugal stages in compressors of
modern aircraft gas turbine engines and power plants. The aim of this work is a computational
study of the effect of the meridional contour shape of a centrifugal compressor wheel on its
power characteristics. The basic method is a numerical simulation of 3D turbulent gas flows in
centrifugal wheels on the basis of the complete averaged Navier¬–Stokes equations and a
two-parameter turbulence model. The computational study features: varying the shape of the hub
and tip part of the meridional contour over a wide range, formulating quality criteria as the
mean integral values of the wheel power characteristics over the operating range of the air
flow rate through the wheel, and a systematic scan of the independent variable range at points
that form a uniformly distributed sequence. As a result of multiparameter calculations, it was
shown that in the case of a flow without separation in the blade channels of a wheel with
a given starting shape of the meridional contour, varying that shape has an insignificant
effect on the wheel power characteristics. It is pointed out that in similar cases it seems
to be advisable to aerodynamically improve centrifugal wheels by varying the shape of their
blades in the circumferential direction rather than in the meridional plane. This conclusion
was made using rather a “coarse” computational grid, which, however, retains the sensitivity
of the computed results to a variation in the centrifugal wheel geometry. On the whole, this
work clarifies ways of further aerodynamic improvement of centrifugal compressor impellers
in cases where the starting centrifugal wheel is a well-designed wheel with a flow without
separation in the blade channels. The results obtained may be used in the aerodynamic
optimization of centrifugal stages of aircraft gas turbine engines.
centrifugal compressor wheel, meridional contour, Bezier curve, numerical simulation, power characteristics
1. Benini E., Giacometti S. Design, manufacturing and operation of a small turbojet-engine for research purposes. Applied Energy. 2007. V. 84. Pp. 1102-1116.
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