UAV Safety Guard Guide Member and Diffuser Thrust
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Solution Overview
Problem
Conventional unmanned aerial vehicles (UAVs) face performance degradation due to the installation of safety guards, which increase weight and rotor blade resistance, affecting thrust, while regulatory requirements necessitate their inclusion to ensure safety.
Innovation Solution
A safety guard design featuring a guide member and diffuser that stabilizes the flow field and generates secondary flows to enhance thrust, comprising a guide member coaxially aligned with the rotor blade and a diffuser radially spaced apart, which amplifies the flow rate and pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional safety guard covering the entire rotor blade is installed, then safety against rotor blade damage and injury is improved, but weight and rotor blade resistance increase, degrading thrust performance
Solution Approach 1:
The safety guard is divided into multiple functional segments: a guide member with a specific angle range (30-60 degrees) to control flow, and a diffuser member with gradual expansion to generate secondary flow. This segmentation allows each part to perform its specific function optimally while maintaining overall safety and improving thrust efficiency
Solution Approach 2:
Different portions of the safety guard have different geometric properties tailored to specific functions. The guide member has a controlled expansion angle for flow stabilization, while the diffuser member has a gradual expansion ratio (5-15 degrees) for secondary flow generation. This local optimization resolves the contradiction by making each section contribute positively to both safety and thrust
2Reliability
If a conventional safety guard is installed, then protection against collision damage is improved, but the overall vehicle weight increases, affecting flight performance
Solution Approach 1:
The safety guard is designed as a thin-walled structure with optimized geometric parameters rather than a bulky solid enclosure. The guide member and diffuser member use thin shell structures that provide necessary protection while minimizing weight addition to the vehicle
Solution Approach 2:
The safety guard's geometric parameters (expansion angles, gap distances, radial spacing) are optimized to achieve the desired protection level with minimal material. By changing these parameters, the structure provides adequate protection while keeping weight increase minimal
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 increases thrust by 17% and pressure by 2.5 times compared to conventional UAVs, while maintaining stability against rotor blade damage and ensuring safety, thus optimizing performance and compliance with regulations.
Implementation Method 1
the guide member being configured to stabilize a flow field suctioned by a negative pressure when the rotor blade rotates, and to stably push an ejection flow when switching to a positive pressure
Implementation Method 2
a diffuser, which is disposed coaxially with and radially spaced apart from the guide member, the diffuser being configured to generate a secondary flow toward a main stream to increase a flow rate
Data Source
AI summary
An unmanned aerial vehicle according to the present invention may comprise: a rotor-blade for providing thrust according to generation of main stream; and a safety guard disposed to surround the rotor-blade. The safety guard may comprise: a guide member which is disposed coaxially with the rotor-blade while having a gap between the guard member and the end of the rotor-blade, so as to stabilize, when the rotor-blade rotates, a flow field suctioned by a negative pressure, and stably boost a discharge flow when the pressure is changed to a positive pressure; and a diffuser which is disposed coaxially with and radially spaced apart from the guide member, and generates a secondary flow toward the main stream to increase a flow rate.