Optimization method for low-pressure axial fan impeller blade

A technology of impeller blades and optimization method, which is applied to the components of pumping devices for elastic fluids, mechanical equipment, non-variable-capacity pumps, etc. , to achieve the effect of shortening design time and cost

Active Publication Date: 2017-07-14
嘉兴笼列电子商务有限公司
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Problems solved by technology

Therefore, there is a transverse pressure gradient in the boundary layer, but there is no or very little centrifugal force of the airflow, so the transverse gradient pressure in the boundary layer cannot be balanced, and the gas in the boundary layer will flow from the concave surface of one blade to the other. The lateral flow of the convex surface adjacent to the blade reduces the pressure in the boundary layer near the concave surface of the blade, while the pressure increases near the convex surface of the adjacent blade, thus forming a vortex

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  • Optimization method for low-pressure axial fan impeller blade
  • Optimization method for low-pressure axial fan impeller blade

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with accompanying drawing.

[0026] The specific steps of the optimization method for the impeller blades of the low-pressure axial flow fan are as follows:

[0027] Step 1. Establish the impeller model to be optimized as figure 1 As shown, the impeller to be optimized is the impeller of the SDF-11.2 tunnel axial flow fan produced by Shaoxing Shangyu Jiuyang Fan Co., Ltd., and the distance between the hub side wall of the impeller and the outer end of the blade is 8s. On one blade of the model, eight sections vertical to the radial direction of the impeller and the corresponding molding lines of the eight sections are taken. The distance between adjacent sections is s, and the innermost section is tangent to the side wall of the hub. Measure the chord length b of the eight sections respectively i , i=1,2,3,...,8, and the exit geometric angle β 2A(i) , i=1,2,3,...,8. Remove all chamfers and rounded ...

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Abstract

The invention discloses an optimization method for a low-pressure axial fan impeller blade. A low-pressure axial fan is widely applied, but the problems of low total pressure, large air volume and low impeller efficiency exist. According to the optimization method, the blade of a to-be-optimized impeller model is divided into n sections in the radial direction of the impeller, and the chord length bi, the outlet geometric angle beta 2A (i) and an inlet airflow angle beta1 (i) of the n sections are obtained. A sketch is drawn and comprises a first line segment, a second line segment, a third line segment, a fourth line segment, a fifth line segment, a sixth line segment, a first circular arc, a second circular arc, a seventh line segment and an eighth line segment. The first circular arc and the second circular arc form a novel line. According to the novel line, n new sections are obtained, and the optimized impeller model is obtained according to the n new sections. According to the optimization method, the performance of the low-pressure axial fan can be optimized only by knowing the chord length, the inlet airflow angle and the outlet geometric angle of the sections of the to-be-optimized blade, design time is shortened greatly, and cost is reduced greatly.

Description

technical field [0001] The invention belongs to the technical field of fan impellers, and in particular relates to an optimization method for blades of a low-pressure axial flow fan impeller. Background technique [0002] Low-pressure axial flow fans are widely used as the main power of industrial equipment and household appliances such as ventilation, HVAC, cooling, air conditioning and transportation. The aerodynamic characteristics of the axial flow fan are low total pressure, large air volume, and low impeller efficiency. The reason is that there is a gap between the blade and the pipe, there is a secondary flow at the top of the blade, the blade root is connected to the hub, and the separation flow is also serious. There are a large number of vortices near the tip of the blade, and even backflow, causing a large flow loss. [0003] In an axial flow fan, the pressure loss when the airflow passes through the blades is very complicated, and the pressure loss distribution ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/38
CPCF04D29/38
Inventor 窦华书王天垚徐金秋贾会霞贺磊盈董若凌赵新龙
Owner 嘉兴笼列电子商务有限公司
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