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Diffuser with self-adaptive curvature profile in semi-vaneless area

A diffuser, self-adaptive technology, applied in the direction of machines/engines, components of pumping devices for elastic fluids, coatings, etc., can solve the problem of affecting the stability of radial diffusers and centrifugal impellers to match diffusers Range, non-uniform velocity, degraded radial diffuser performance, etc.

Active Publication Date: 2021-06-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In high-load centrifugal compressors, the design of radial vane diffusers is a difficult point and a hot spot. Due to the high-load centrifugal impeller outlet air velocity is high and very uneven, especially at the tip of the impeller due to the expansion of the flow channel and tip leakage. Affected by other factors, it is very easy to form an obvious low-velocity zone, and even separation occurs at the outlet of the impeller, resulting in very bad conditions at the inlet of the radial diffuser. The performance of the diffuser seriously affects the matching of the radial diffuser and the centrifugal impeller and the stable working range of the diffuser. The design of an efficient diffuser is very challenging

Method used

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  • Diffuser with self-adaptive curvature profile in semi-vaneless area
  • Diffuser with self-adaptive curvature profile in semi-vaneless area
  • Diffuser with self-adaptive curvature profile in semi-vaneless area

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1: as figure 2 The shown diffuser has a self-adaptive curvature profile in the semi-bladeless area, including the upper and lower diffuser cover 3, the diffuser disc 2, and the diffuser cover respectively 3. Axial diffuser blades 1 and radial diffuser blades 4 between the diffuser discs 2;

[0039] Such as figure 2 As shown, the diffuser disc 2 includes an annular disc 21 uniformly provided with first through holes 210 in the circumferential direction, and a disc barrel 22 arranged on the annular disc 21;

[0040] The diffuser wheel cover 3 includes an annular wheel cover 31 uniformly provided with second through holes 310 in the circumferential direction, and a wheel cover tube 32 arranged on the annular wheel cover 31;

[0041] The number of the first through hole 210, the second through hole 310 and the radial diffuser blade 4 are equal and the positions between the first through hole 210 and the second through hole 310 are corresponding, and the radia...

Embodiment 2

[0053] Embodiment 2: Different from Embodiment 1: as Image 6 As shown, the radial diffuser blade 4 includes a first baffle blade 41 and a second baffle blade 42 whose head and tail ends are connected to each other; it can be prepared simultaneously with the wheel disc and the wheel cover to realize the integrated preparation of the diffuser; wherein, the diffuser The integrated preparation method of the compressor is as follows: firstly model the radial diffuser blade 4 according to the above-mentioned modeling method, and determine the modeling structure of the second baffle blade 42; then use UG 3D software to create a 3D model of the diffuser, The diffuser is then integrated with a 3D printing device to obtain a diffuser base; and then the diffuser base is sintered to obtain a diffuser.

experiment example

[0054] Experimental example: The expander of Example 1 of the present invention and the traditional expander were applied to different compressors for performance comparison. Such as Figure 7 , 8 As shown in the preliminary performance comparison, it is found that the adaptive curvature diffuser can improve the stage pressure ratio and peak efficiency of the original compressor by 0.041 and 1.8% on the basis of ensuring that the static pressure recovery coefficient is not lower than that of the original wedge diffuser, At the same time, it has a wider margin.

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Abstract

The invention provides a diffuser with a self-adaptive curvature profile in a semi-vaneless area. The diffuser comprises a diffuser wheel cover, a diffuser wheel disc, axial diffuser blades and radial diffuser blades; a modeling method comprises the steps that Bezier curve modeling is adopted and is tangent to a suction surface molded line where a throat portion is located, and a curve is bent towards a pressure surface side so as to adapt to the high-speed Mach number of incoming flow; for a diffusion channel part, a suction surface and a pressure surface of the diffuser have a certain angle deviation in the circumferential direction and are in an axial symmetry shape by taking the central line of the channel as the axis, and the whole flow channel is trumpet-shaped; and the diffuser has the characteristics of convenience in modeling, low manufacturing cost and simplicity in machining, and the efficiency, a pressure ratio and a stable working margin of a centrifugal compressor can be greatly improved.

Description

technical field [0001] The invention relates to the technical field of aero-engine manufacturing, in particular to a diffuser with an adaptive curvature profile in a semi-bladeless area. Background technique [0002] The centrifugal compressor has the advantages of compact structure, high pressure ratio, high reliability, convenient manufacture, low cost, good workmanship and wide stable working margin, etc., and is widely used in small and medium-sized aeroengines. [0003] In high-load centrifugal compressors, the design of radial vane diffusers is a difficult point and a hot spot. Due to the high-load centrifugal impeller outlet air velocity is high and very uneven, especially at the tip of the impeller due to the expansion of the flow channel and tip leakage. Affected by other factors, it is very easy to form an obvious low-velocity zone, and even separation occurs at the outlet of the impeller, resulting in very bad conditions at the inlet of the radial diffuser. The p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/44F04D29/02F04D29/58
CPCF04D29/023F04D29/441F04D29/444F04D29/5853F05D2300/2118F05D2300/611
Inventor 王毅
Owner CENT SOUTH UNIV
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