Propeller Blade End Plate Vortex Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Gaps between the spinner and the shank of propeller blades allow airflow to spill through, creating localized vortices that reduce the efficiency of the aerodynamic surfaces by disrupting airflow over the propeller blades.
Innovation Solution
A propeller blade design featuring an end plate positioned at the blade base, which projects outwardly from the pressure and suction side surfaces, creating a physical barrier that blocks or redirects airflow and reduces vortex formation, thereby enhancing aerodynamic efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If gaps are provided between the spinner and the shank for structural assembly, then ease of manufacture is improved, but airflow spills through creating vortices that reduce blade efficiency
Solution Approach 1:
An end plate is introduced as an intermediary component between the spinner and the propeller blade. The end plate fills the gap space and provides a physical barrier that redirects airflow, preventing it from spilling through the gap and creating vortices. This intermediary structure resolves the contradiction by maintaining the gap for assembly purposes while eliminating its harmful aerodynamic effects.
Solution Approach 2:
The propeller blade assembly is segmented into distinct components: the spinner, the end plate, and the blade body. This segmentation allows the end plate to be positioned specifically at the interface between the spinner and blade, creating a modular structure that addresses airflow issues without compromising the overall assembly ease.
2Productivity
If the end plate projects outwardly from the blade base to block airflow, then blade efficiency is improved by reducing vortices, but device complexity increases
Solution Approach 1:
The end plate is positioned locally at the blade base where airflow disruption occurs, rather than modifying the entire blade structure. This localized approach addresses the specific problem area (gap-induced vortices) without adding complexity to other parts of the propeller system, thereby improving blade efficiency with minimal increase in overall device complexity.
3Productivity
If the end plate creates a physical barrier to redirect airflow, then vortex formation is reduced improving thrust generation, but manufacturing precision requirements increase
Solution Approach 1:
The end plate is designed to extend slightly beyond the minimum necessary to block airflow, ensuring effective vortex suppression without requiring extremely tight manufacturing tolerances. This partial excessive action provides a margin of error in manufacturing while still achieving the primary function of redirecting airflow and improving thrust generation.
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 end plate design significantly reduces the creation and movement of vortices, improving propeller blade efficiency and thrust generation by stabilizing airflow, thus enhancing aircraft control and performance during various flight conditions.
Implementation Method 1
Airflow may spill through those gaps and create localized vortices that may migrate up the propeller blade
Implementation Method 2
The propeller blade includes aerodynamic surfaces that extend from a blade root connected to the shank to the blade tip portion
Data Source
AI summary
A propeller blade having a blade body including a blade base, a blade tip, a pressure side surface, and, a suction side surface. Each of the pressure side surface and the suction side surface extend between the blade base to the blade tip. An end plate is provided on the blade body. The end plate is exposed to an airflow and positioned at the blade base. The end plate projects outwardly of at least a portion of one of the pressure side surface and the suction side surface.