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Centrifugal impeller flow passage design method for controlling curvature distribution

A technology of centrifugal impeller and design method, applied in mechanical equipment, components of pumping device for elastic fluid, non-variable-capacity pump, etc. The effect of improving work efficiency

Active Publication Date: 2013-04-03
TSINGHUA UNIV
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Problems solved by technology

This design method is easy to cause flow loss and reduce the work efficiency of centrifugal impeller machinery

Method used

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  • Centrifugal impeller flow passage design method for controlling curvature distribution
  • Centrifugal impeller flow passage design method for controlling curvature distribution
  • Centrifugal impeller flow passage design method for controlling curvature distribution

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Embodiment Construction

[0022] The present invention provides a centrifugal impeller flow channel design method for controlling the curvature distribution. The present invention will be further described below in conjunction with the accompanying drawings and specific implementation methods.

[0023] The axial longitudinal section of centrifugal impeller machinery is generally called meridian flow channel. The meridian runner is enveloped by wheel cover line 1, hub line 2, inlet line 3 and outlet line 4, as figure 1 and figure 2 shown.

[0024] The design steps of the meridian flow channel are:

[0025] (1) According to the formula Determine the curvature distribution curve of the wheel cover line, take μ=0.5, A=0.03, m is in the interval [0,1], and e is a natural constant 2.718, so the distribution curve of C is obtained as image 3 The center wheel cover curvature is shown.

[0026] (101) Take n=100 points on the curvature distribution line as the curvature value required for determining the...

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Abstract

The invention belongs to a fluid mechanical design modeling method and particularly relates to a centrifugal impeller flow passage design method for controlling the curvature distribution. A meridional flow passage of a centrifugal impeller comprises the following design steps that the parametric forming is realized through controlling the axial distribution of the curvature of a wheel cover line and a wheel hub line; and then, an obtained wheel cover and an obtained wheel hub curve rotate for 360 degrees around a rotating shaft, and a wheel cover surface and a wheel hub surface are obtained. The design method has the advantages that the proper curvature distribution rule can be flexibly selected according to the flowing work applying condition of the centrifugal impeller through controlling the curvature of the flow passage curves, the work apply efficiency and the stable work boundary of the centrifugal impeller are improved, and the design method can be widely applied to various kinds of centrifugal and inclined flow type impeller mechanical flowing designs.

Description

technical field [0001] The invention belongs to a fluid machine design modeling method, in particular to a centrifugal impeller flow path design method for controlling curvature distribution. Background technique [0002] Centrifugal impeller machinery is a core component of jet aeroengines, and is widely used in the field of functional conversion of various fluid compressions or fluid expansions. The design of the meridian channel of the centrifugal impeller machinery has a great influence on the performance of the centrifugal impeller machinery. However, there is no clear design criterion for the design of the meridian flow channel. Generally, it depends on the experience of the designer, and the design is relatively subjective. At present, the conventional design method of wheel cover line and hub line is generally formed by connecting arcs and straight lines. This design method is easy to cause flow loss and reduce the work efficiency of centrifugal impeller machinery....

Claims

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Application Information

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IPC IPC(8): F04D29/22
Inventor 徐全勇黄旭东周明
Owner TSINGHUA UNIV
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