Axial flow blade form

An airfoil and axial flow technology, applied in the field of axial flow fan and axial flow airfoil, can solve the problem of low efficiency of axial flow blades, and achieve the effect of solving low impeller efficiency, high efficiency and wide range of working conditions.

Active Publication Date: 2016-11-23
HUAZHONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the purpose of the present invention is to provide an axial flow blade profile, wherein the key shape parameters (such as blade inlet installation angle, blade outlet installation angle, chord length with blade height) Specific changes, etc.) are improved, compared with the prior art, it can effectively solve the problem of low efficiency of the axial flow blade, and the axial flow blade type can be especially applied to the single impeller axial flow fan, so that the axial flow fan can be used more efficiently. High efficiency in a wide range of flow rates (applicable flow rate can reach 10,000 to 40,000 cubic meters per hour)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] The diameter of the impeller in this embodiment is 900 mm, the hub ratio is 0.211, and the number of blades is 7. The cubic spline curve of the blade inlet angle passes through 6 control points (1~6) in turn, and the position coordinates of these 6 control points are (coordinate format is (blade height percentage, blade inlet angle)): (0%, 23.46° ), (20%, 18.68°), (40%, 12.87°), (60%, 8.77°), (80%, 6.35°), (100%, 6.32°); the cubic spline curve of the blade outlet angle in turn After passing through 6 control points (1~6), the position coordinates of these 6 control points are (coordinate format is (blade height percentage, blade outlet angle)) in turn: (0%, 56.62°), (20%, 51.24°), (40%, 46.87°) (60%, 41.88°), (80%, 30.32°), (100%, 24.88°); six control points of the blade chord cubic spline curve (1- 6) Position coordinates (coordinates in the form of (blade height percentage, chord length)) are: (0%, 120.6mm), (20%, 115.4mm), (40%, 109.7mm) (60%, 105.0mm) , (80%, 100....

Embodiment 2

[0095] The diameter of the impeller in this embodiment is 900 mm, the hub ratio is 0.211, and the number of blades is 7. The cubic spline curve of the blade inlet angle passes through 6 control points (1~6) in turn, and the position coordinates of these 6 control points are (coordinate format is (blade height percentage, blade inlet angle)): (0%, 28.46° ), (20%, 23.68°), (40%, 17.87°), (60%, 13.77°), (80%, 11.35°), (100%, 11.32°); the cubic spline curve of the blade outlet angle in turn After passing through 6 control points (1~6), the position coordinates of these 6 control points are (coordinate format is (blade height percentage, blade outlet angle)): (0%, 61.62°), (20%, 56.24° ), (40%, 51.87°) (60%, 46.88°), (80%, 35.32°), (100%, 29.88°); 6 control points (1-6) of blade chord cubic spline curve The position coordinates (coordinate format is (blade height percentage, chord length)) are: (0%, 120.6mm), (20%, 115.4mm), (40%, 109.7mm) (60%, 105.0mm), ( 80%, 100.1mm), (100%, ...

Embodiment 3

[0097] The diameter of the impeller in this embodiment is 900 mm, the hub ratio is 0.211, and the number of blades is 7. The position coordinates of the 6 control points (1-6) of the cubic spline curve of the blade inlet angle (the coordinates are in the form of (blade height percentage, blade inlet angle)) are: (0%, 33.46°), (20%, 28.68° ), (40%, 22.87°), (60%, 18.77°), (80%, 16.35°), (100%, 16.32°); 6 control points (1-6 ) position coordinates (the coordinate form is (blade height percentage, blade inlet angle)) in turn: (0%, 66.62°), (20%, 61.24°), (40%, 56.87°) (60%, 51.88°) , (80%, 40.32°), (100%, 34.88°); the position coordinates of 6 control points (1-6) of the cubic spline curve of blade chord length (the coordinate form is (blade height percentage, chord length)) in turn For: (0%, 120.6mm), (20%, 115.4mm), (40%, 109.7mm) (60%, 105.0mm), (80%, 100.1mm), (100%, 90.6mm).

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Abstract

The invention discloses an axial flow blade form. The surface of the axial flow blade form comprises a suction curved surface, a pressure curved surface, an upper curved surface and a lower curved surface, wherein the side surfaces of two cylinders cover the upper curved surface and the lower curved surface, the radii of the cylinders corresponding to the upper curved surface and the lower curved surface are separately marked as R2 and R1, and R2 is larger than R1; the side surfaces of a series of coaxial cylinders of which the radii r changing from R1 to R2 are crossed with the axial flow blade form, forming a series of crossed surfaces, and then, the series of crossed surfaces are spread along the plane so as to obtain a series of spread cross sections; and a blade inlet angle varies with the variation of the ratio value of a height ratio, and both the angle variation of the blade inlet angle and the length variation of a chord meet a cubic spline curve relationship. By improving key shape parameters (for example, the blade inlet mounting angle, the blade outlet mounting angle, the specific variation form of the chord with blade height and the like), the problem that the efficiency of the axial flow blade is low can be effectively solved.

Description

technical field [0001] The invention belongs to the technical field of fan impellers, and more specifically relates to an axial-flow blade type, which belongs to a component part of a fan, and is especially suitable for an axial-flow fan. Background technique [0002] Axial flow fans are widely used in ventilation places in agriculture, industry, transportation and other industries. At present, most axial flow fans have the problem of low efficiency, which is a serious waste of energy and is not conducive to energy saving and emission reduction. [0003] The blade is an important component of the axial flow fan. An efficient blade shape is of great significance to the improvement of the efficiency of the axial flow fan. Therefore, it is of great application value to develop an efficient axial flow blade shape. [0004] There are many design parameters for axial flow fan blades, and the parameters vary widely, and different types of design parameters have different effects on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/38
CPCF04D29/384
Inventor 王军唐俊吴兰勇隽智辉解博超李清泉
Owner HUAZHONG UNIV OF SCI & TECH
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