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Full-three-dimensional sawtooth trailing edge blade of turbomachinery and design method

A technology of impeller machinery and design methods, applied in the direction of mechanical equipment, supporting elements of blades, engine elements, etc.

Active Publication Date: 2022-04-29
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the application of the methods involved in the above patents on real three-dimensional blades of turbomachinery has great limitations

Method used

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  • Full-three-dimensional sawtooth trailing edge blade of turbomachinery and design method
  • Full-three-dimensional sawtooth trailing edge blade of turbomachinery and design method
  • Full-three-dimensional sawtooth trailing edge blade of turbomachinery and design method

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Embodiment Construction

[0055] The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0056] The design method of the sawtooth trailing edge blade of the turbomachinery involved in the present invention performs coordinate transformation on the basis of the reference blade, and is applicable to but not limited to full three-dimensional blades. In order to illustrate the applicability of the method, in the following content, the present invention takes the last-stage stator blade of the GEE3 low-pressure turbine as an example to illustrate the specific implementation of the method.

[0057] according to figure 1 Schematic diagram of the method flow chart, see figure 2 — Figure 5 , the present invention includes the following technical solutions:

[0058] 1. Based on the reference blade and according to the actual blade geometry needs, m blade shape coordinate data ...

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Abstract

The invention discloses a full-three-dimensional sawtooth trailing edge blade of a turbomachine and a design method, and belongs to the field of turbomachine noise control. The blade is formed by stacking blade molded lines with different chord lengths in the spanwise direction, and the tail edge of the formed blade is of a sawtooth structure. The method comprises the steps that firstly, the pressure surface / suction surface thickness, the pressure surface / suction surface slope and the distance between two adjacent points on a mean camber line are solved based on pressure surface coordinate data, suction surface coordinate data and mean camber line coordinate data of a reference blade; then, the wave trough position and the wave crest position of sawteeth are determined, coordinate data of a mean camber line of the blade profile of the sawtooth trailing edge are solved through the distance dnew between adjacent points of the mean camber line of the blade of the sawtooth trailing edge and the polynomial function F (x, y, z), and then the pressure surface coordinate and the suction surface coordinate of the transformed blade profile are solved; and finally, obtaining coordinate data of a single sawtooth trailing edge blade profile, and stacking the spanwise blade profiles in the spanwise direction to obtain coordinate data of the whole full-three-dimensional sawtooth trailing edge blade. The noise reduction effect can be effectively improved.

Description

technical field [0001] The invention belongs to the field of impeller machinery noise control, and in particular relates to a full three-dimensional sawtooth trailing edge blade of an impeller machinery and a design method thereof. Background technique [0002] Inspired by the silent flight of owls, the sawtooth trailing edge structure of blades has been extensively studied in fields such as aero-engines. The research shows that the sawtooth structure changes the radial phase change of the pressure pulsation at the trailing edge of the blade and effectively reduces the noise level. However, the current research work on the noise reduction mechanism and noise reduction effect of serrated trailing edge blades is mainly carried out with two-dimensional airfoils, fans and other objects, and the application to turbines is still blank. In addition, most sawtooth trailing edge structures are generated by cutting or adding methods, which are not suitable for turbomachinery three-di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/17F01D5/14G06F119/14
CPCG06F30/17F01D5/141F01D5/147G06F2119/14
Inventor 向康深陈伟杰连健欣陶孟尧乔渭阳
Owner NORTHWESTERN POLYTECHNICAL UNIV
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