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Centrifugal impeller flow passage design method for controlling slope 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. Improve functional work efficiency, good flow performance, and the effect of improving work efficiency

Active Publication Date: 2015-06-10
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

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Embodiment Construction

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

[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 with figure 2 shown.

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

[0025] (1) The slope distribution law of the wheel cover line and the hub line, using the cubic polynomial S(x)=Ax 3 +Bx 2 +Cx+D to determine, where S is the slope of the curve, x is the length of the dimensionless flow direction, A, B, C, and D are dimensionless coefficients, and the specific values ​​are shown in the following table:

[0026]

A

B

C

D

wheel cover line

3e-4

4.0e-2...

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Abstract

The invention belongs to fluid mechanical design modeling methods and in particular relates to a centrifugal impeller flow passage design method for controlling slope distribution. Meridional flow passage design steps of a centrifugal impeller comprise the following steps: carrying out parameterized formation by controlling distribution of slopes of a wheel cap line and a wheel hub line in the axial direction; and then rotating an obtained wheel cap curve and a wheel hub curve with 360 degrees around a rotation shaft to obtain a wheel cap face and a wheel hub face. Appropriate slope distribution regularity can be flexibly selected to control distribution of flow load of the centrifugal impeller in the axial direction according to flow acting situations of the centrifugal impeller by controlling the slopes of the flow passage curves, and the acting efficiency and the stable work boundary of the centrifugal impeller are improved. The centrifugal impeller flow passage design method can be widely applied to flow design of various centrifugal and diagonal flow turbomachinery.

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 slope 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 meridian runner profile 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. Content...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D29/22
Inventor 徐全勇黄旭东周明
Owner TSINGHUA UNIV
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