Propeller Blade Tip Slot with Pressure Equalizing Element
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Solution Overview
Problem
Existing propeller blades and wind turbine blades suffer from significant energy losses due to vortices generated at the wide, non-pointed tips, which are not effectively addressed by current designs that focus on reducing material or creating complex control elements, neglecting strength and pressure unevenness issues.
Innovation Solution
A propeller blade design featuring a slot connecting the pressure and suction sides at the blade tip, with a pressure equalizing element, that generates counter-vortices to reduce or eliminate tip vortices, while ensuring minimal air resistance and adequate strength through empirical geometry and location determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the blade tip is made wide to achieve ideal performance with limited diameter, then the power output is improved, but significant vortices are generated at the blade tip causing energy losses
Solution Approach 1:
The blade tip is segmented into multiple sections with individual control elements (flaps or plates) that can independently adjust to optimize performance and reduce vortices across different spanwise locations
Solution Approach 2:
Control elements are positioned at the blade tip extending in the spanwise direction, utilizing the third dimension to intercept and redirect vortex flows before they form, converting the problem from a two-dimensional tip geometry issue to a three-dimensional flow control solution
2Loss of energy
If winglets are used to reduce vortices at the blade tip, then energy losses are reduced, but the device complexity increases and additional load is imposed on the blade
Solution Approach 1:
The control elements are integrated directly into the blade structure at the tip region, merging the vortex reduction function with the existing blade geometry rather than adding separate winglet structures
Solution Approach 2:
The control elements are designed to automatically adjust to flow conditions through aerodynamic forces, eliminating the need for complex active control systems while maintaining effectiveness
3Object-affected harmful factors
If slots are created in the blade to relieve vacuum and reduce noise, then noise is reduced, but the structural strength of the blade is compromised
Solution Approach 1:
Relief slots are positioned specifically at the blade tip region where vacuum effects are most pronounced, rather than creating slots across the entire blade span, thus localizing the structural impact to the least critical area
Solution Approach 2:
Instead of creating full-length slots across the entire blade, only partial slots are implemented at the tip region, providing sufficient relief for noise and vacuum reduction while maintaining structural integrity of the main blade body
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
The design achieves uniform flow conditions across the blade tip, reducing energy losses and maintaining structural integrity, with minimal maintenance requirements and no additional load, effectively addressing the inefficiencies and strength concerns of previous solutions.
Implementation Method 1
a pressure equalizing element, that equalizes pressure in the slot
Implementation Method 2
generates counter-vortices to reduce or eliminate tip vortices
Data Source
AI summary
The subject of the invention is a propeller blade that has minimal blade tip loss, has a pressure side, opposite to that a suction side, a blade root that can be attached to the propeller and opposite to the blade root a blade tip, where the pressure side is attached to the suction side with a slot that has an inlet opening on the pressure side and an outlet opening on the suction side, and the slot has a pressure equalizing element in it.Furthermore, the subject of the invention is a propeller that can be used for airplanes, helicopters, horizontal-axis wind turbines, fans and drones and that has at least one propeller blade which is designed according to the first aspect of the invention.