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1/2-type tandem-blade diffuser

A diffuser and vane type technology, which is applied in the field of tandem vane diffusers, can solve the problems of narrow stable operation range and small pressurizing capacity of the rear vanes, so as to expand the effective flow area and improve the diffusing capacity. , the effect of reducing surge flow

Inactive Publication Date: 2009-11-25
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention provides a 1 / 2 type tandem vane diffuser in order to solve the problems of the traditional tandem vane diffuser with narrow stable operating range and small boosting capacity of the rear blades

Method used

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  • 1/2-type tandem-blade diffuser
  • 1/2-type tandem-blade diffuser
  • 1/2-type tandem-blade diffuser

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1, when the overlapping degree Δm of the rear row of blades 2 and the front row of blades 1 = 20%, the staggered degree Δθ of the rear row of blades and the front row of blades is 5%, and the relative division position m of the rear row of blades and the front row of blades is 20%;

Embodiment 2

[0026] Embodiment two, when the inlet of the rear row of blades 2 is flush with the outlet of the front row of blades 1, that is, when Δm=0%, the staggered degree Δθ of the rear row of blades and the front row of blades is 25%, and the rear row of blades and the front row of blades The relative split position m is 40%;

Embodiment 3

[0027] Embodiment 3, when the overlapping degree Δm=-5% of the rear row of blades 2 and the front row of blades 1, the staggered degree Δθ of the rear row of blades and the front row of blades is 45%, and the relative division positions of the rear row of blades and the front row of blades m is 70%.

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Abstract

The invention discloses a 1 / 2-type tandem-blade diffuser, which comprises two parallel opposite annular plates, wherein an annular channel is formed between the opposite annular surfaces of the two annular plates; the circumferential inner side of the annular channel is evenly provided with front-row blades; the circumferential outer side of the annular channel is evenly provided with back-row blades; and the front-row blades and the back-row blades are mutually partitioned, staggered and overlap. The diffuser is characterized in that the number ratio of the front-row blades to the back-row blades is 1:2. The diffuser adopts low-density layout for the front-row blades so as to effectively increase the geometric throat size and through-flow area of blade channels and expand blockage flow; the back-row blades are in high-density layout so as to effectively increase leaf-type turning angle and improve the diffusion capability of the back-row blades; and by utilizing the flow acceleration characteristic of gap areas between the front-row blades and the back-row blades, the boundary-layer flow of the back-row blades is controlled not to separate so as to reduce surge flow.

Description

technical field [0001] The invention relates to a vane diffuser, in particular to a tandem vane diffuser with a number ratio of front and rear rows of vanes of 1:2. Background technique [0002] The two most important components of a centrifugal compressor are the centrifugal impeller and the diffuser. The rotating centrifugal impeller converts the mechanical energy of the rotating shaft into pressure energy and kinetic energy of the gas through centrifugal force; the diffuser further converts part of the kinetic energy into pressure energy. In general, the gas velocity at the outlet of the centrifugal impeller can reach 200-300m / s, and the gas velocity at the outlet of the high-energy head impeller is sometimes above 500m / s. This part of kinetic energy accounts for about 25%-40% of the total power consumption of the backward curved impeller %, 50% of the total power consumption of the radial impeller, so the structure of the diffuser and its internal flow conditions have a...

Claims

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Application Information

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IPC IPC(8): F04D29/44
Inventor 张楚华袁丹妮
Owner XI AN JIAOTONG UNIV
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