Blade With Inflection Points and Grooves for Noise Reduction
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Solution Overview
Problem
Conventional blades in rotating machines suffer from low aerodynamic performance and high noise due to severe flow separation and vortex formation, primarily caused by monotone smooth leading and trailing edges.
Innovation Solution
The blade design features a leading edge with an even number of inflection points (2, 4, or 6) and a trailing edge with grooves, where the groove depth is proportional to the groove length, and the included angle between groove walls ranges from 10° to 100°, reducing vortex formation and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If monotone smooth leading and trailing edges are used, then manufacturing is simple, but flow separation occurs and vortex formation increases leading to low aerodynamic performance and high noise
Solution Approach 1:
The patent applies local quality by introducing inflection points on the leading edge and grooves on the trailing edge only in specific regions where flow separation occurs. The leading edge has inflection points distributed along its length, and the trailing edge has grooves at specific positions and depths, rather than changing the entire blade structure. This localized modification improves aerodynamic performance while keeping manufacturing relatively simple.
Solution Approach 2:
The patent uses curvature modifications by introducing inflection points on the leading edge that create convex and concave curved sections. These curved sections alter the flow pattern over the blade surface, reducing flow separation and vortex formation. The trailing edge grooves also create specific curvature patterns that help control flow separation at the critical trailing edge region.
2Device complexity
If monotone smooth leading and trailing edges are used, then device complexity is low, but noise generation is high due to vortex formation
Solution Approach 1:
The patent applies local quality by introducing inflection points on the leading edge and grooves on the trailing edge only in specific regions where flow separation occurs. The leading edge has inflection points distributed along its length, and the trailing edge has grooves at specific positions and depths, rather than changing the entire blade structure. This localized modification improves aerodynamic performance while keeping manufacturing relatively simple.
Solution Approach 2:
The patent uses curvature modifications by introducing inflection points on the leading edge that create convex and concave curved sections. These curved sections alter the flow pattern over the blade surface, reducing flow separation and vortex formation. The trailing edge grooves also create specific curvature patterns that help control flow separation at the critical trailing edge region.
3Reliability
If inflection points and grooves are added to the blade edges, then aerodynamic performance improves, but manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by introducing inflection points on the leading edge and grooves on the trailing edge only in specific regions where flow separation occurs. The leading edge has inflection points distributed along its length, and the trailing edge has grooves at specific positions and depths, rather than changing the entire blade structure. This localized modification improves aerodynamic performance while keeping manufacturing relatively simple.
Solution Approach 2:
The patent uses parameter changes by specifying particular ranges for inflection point distribution, groove depth, groove width, and groove spacing. These parameters are optimized to achieve the desired aerodynamic performance while remaining manufacturable. The groove depth is controlled within specific limits, and the groove spacing follows particular patterns, allowing for standardized manufacturing processes.
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 significantly improves aerodynamic performance by reducing turbulence and noise, enhancing the blade's operational reliability and efficiency.
Implementation Method 1
Due to the serious flow separation on the surface of the blade, vortices are formed
Implementation Method 2
vortices are formed, and consequently the blade produces low aerodynamic performance and high noise
Implementation Method 3
This design significantly improves aerodynamic performance by reducing turbulence and noise
Data Source
AI summary
The present application discloses a blade, comprising a blade tip, a blade root, a leading edge, and a trailing edge, wherein the leading edge and the trailing edge each extend from the blade tip to the blade root; the blade may rotate around a rotation axis, and the rotation axis and a normal plane of the rotation axis perpendicularly intersect at the foot of the perpendicular; a projection of the leading edge on the normal plane along the rotation axis is a first curve, and the first curve has an even number of inflection points. The blade of the present application can reduce noise and improve aerodynamic performance when the blade rotates.