Variable Curvature Blade Tip for Axial Fan Energy Loss Reduction
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Solution Overview
Problem
Existing axial air moving devices face challenges in improving operation efficiency and energy savings, as the blade structure design does not effectively reduce energy loss and torque at the blade tip, leading to suboptimal performance and energy consumption.
Innovation Solution
The axial air moving device features blades with variable curvature, where the blade angle at the tip is at least 10 degrees less than at the span position of 0.8, reducing energy loss and torque, and requiring less operational energy to achieve the same performance as previous designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the blade angle is maintained uniformly across the span, then the structural design is simpler, but the energy loss at the blade tip increases due to tip vortex and tangential force torque
Solution Approach 1:
The patent applies local quality by varying the blade angle specifically at the tip region (span position 0.8 to 1.0) while maintaining other blade sections. The blade tip angle is set to be 10-20 degrees smaller than at span position 0.8, creating a localized modification that reduces tip vortex energy loss without requiring complete redesign of the entire blade structure.
2Loss of energy
If the blade angle at the tip is reduced by at least 10 degrees compared to span position 0.8, then the energy loss and torque are reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent implements parameter changes by modifying the blade angle parameter specifically in the tip region. The blade angle θ is varied along the span direction, with θ at the tip being 10-20 degrees smaller than at span position 0.8. This parameter modification directly reduces the tangential component of force and associated torque while providing clear quantitative guidelines for manufacturing.
3Use of energy by moving object
If the blade structure is optimized for energy efficiency, then the operation efficiency improves, but the design complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the blade into distinct regions with different angle characteristics: the root region (span position 0 to 0.8) maintains a relatively uniform angle for structural stability, while the tip region (span position 0.8 to 1.0) features a reduced angle for energy efficiency. This segmentation allows optimization of different blade portions for their respective functions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design enhances operational efficiency and energy savings by reducing energy loss and torque, allowing the device to operate with better performance curves under the same power consumption, thereby improving the overall efficiency and practicality of the axial air moving device.
Implementation Method 1
reduce the energy loss of the tip vortex and the torque formed by the tangential component of the force at the blade tip
Data Source
AI summary
This disclosure provides an air moving device with blade tip of variable curvature. The axial air moving device includes a hub and a plurality of blades. The blades are connected with the hub, and each blade is configured by stacking multiple wing sections continuously. Each blade includes a blade root and a blade tip. The span position of the blade at the blade root is defined as 0, and at the blade tip is defined as 1. The blade angle is defined by the nose-tail line of the wing section and the rotation direction of the axial air moving device. The blade angle of the wing section at the blade tip of the blade is at least 10 degrees less than the blade angle of the wing section at the span position of 0.8 of the blade.