Winglet Ejector Configurations for UAV Propulsion Efficiency
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Solution Overview
Problem
Current aircraft, particularly UAVs, face inefficiencies in lift generation and payload capacity due to reliance on propellers, which are inefficient in level flight and have limitations in power density and energy storage, leading to short flight durations and limited payload capabilities.
Innovation Solution
A propulsor system utilizing fluidics to entrain and accelerate ambient air, combining high-pressure gas with ambient air to produce a high-speed jet efflux, leveraging the Coanda effect and optimized nozzle configurations, including secondary nozzles and surface features like dimples, to enhance lift and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If propellers are used for lift generation in level flight, then propulsion is achieved, but efficiency is reduced and flight duration is limited
Solution Approach 1:
The patent employs pneumatic principles by using high-pressure gas (from jet engines or compressed air tanks) to drive ejector nozzles that generate thrust. This replaces traditional propeller-based propulsion with a gas-driven pneumatic system, achieving higher efficiency and extended flight duration through more effective energy utilization
Solution Approach 2:
The system changes the physical parameters of the propulsion medium by using high-pressure gas at controlled pressures (e.g., 300-500 PSI) and temperatures to optimize thrust generation. The ejector nozzle design transforms high-pressure gas into high-velocity jet efflux, changing the state parameters to maximize propulsion efficiency
2Productivity
If propellers are used for lift generation, then propulsion is achieved, but payload capacity is limited
Solution Approach 1:
The pneumatic propulsion system using high-pressure gas and ejector nozzles achieves superior thrust-to-weight ratio compared to propellers, enabling the aircraft to carry heavier payloads while maintaining or improving propulsion efficiency
Solution Approach 2:
The patent integrates multiple propulsion methods (jet engines, compressed air tanks, ejector nozzles) into a composite propulsion system that combines the advantages of different technologies to achieve both high efficiency and increased payload capacity
3Force
If ambient air is entrained and accelerated using fluidics, then lift generation is improved, but device complexity increases
Solution Approach 1:
The ejector nozzle acts as an intermediary device that uses high-pressure gas to entrain and accelerate ambient air. This intermediary mechanism converts compressed gas energy into high-velocity jet efflux that generates lift, simplifying the overall system while improving performance
Solution Approach 2:
The fluidic propulsor system uses ambient air as a free resource, entraining it through the ejector nozzle without requiring additional intake mechanisms or processing. The system serves itself by utilizing the surrounding environment (ambient air) to enhance 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
This approach significantly improves lift generation and propulsion efficiency, enabling longer flight durations and increased payload capacity by effectively utilizing ambient air and reducing energy requirements.
Implementation Method 1
leveraging the Coanda effect and optimized nozzle configurations
Implementation Method 2
A propulsor that utilizes fluidics for the entrainment and acceleration of ambient air
Data Source
AI summary
An ejector system for propelling a vehicle. The system includes a diffusing structure and a duct coupled to the diffusing structure. The duct includes a wall having openings formed therethrough and configured to introduce to the diffusing structure a primary fluid produced by the vehicle. An airfoil is positioned within the flow of the primary fluid through the openings to the diffusing structure.