Compressed Air Propulsion for eVTOL Noise Reduction
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Solution Overview
Problem
Air mobility devices face limitations in flight performance and noise generation due to propeller-based propulsion, with increased propeller size leading to noise issues and distributed propulsion methods still generating operating noise.
Innovation Solution
An air mobility device utilizing rotatable wings with internal open spaces for compressed air circulation and blowers to enhance propulsion through the Coandă effect, allowing vertical and horizontal flight while minimizing noise by using asymmetrically streamlined wing panels and strategically placed discharge holes to concentrate airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If propeller size is increased to secure flight performance, then propulsion capability is improved, but noise generation increases
Solution Approach 1:
The patent uses compressed air propulsion system where air is compressed in a tank and discharged through nozzles to generate thrust. This pneumatic propulsion method replaces traditional propeller-based mechanical propulsion, eliminating propeller rotation noise while maintaining flight capability through controlled air discharge
Solution Approach 2:
The invention replaces the mechanical propeller system with a pneumatic thrust generation system. Instead of using rotating propellers driven by motors, the system uses compressed air stored in a tank that is discharged through nozzles to create thrust, substituting mechanical rotation with pneumatic pressure-driven motion
2Object-generated harmful factors
If distributed propulsion method using multiple electric motors is used to minimize noise, then noise is reduced, but operating noise is still generated due to increased propeller speed
Solution Approach 1:
The system employs compressed air stored in a tank as the propulsion source, eliminating the need for electric motors and rotating propellers. The pneumatic system generates thrust through controlled air discharge, completely avoiding motor operating noise and propeller noise while maintaining propulsion efficiency through pressure-regulated air flow
3Power
If propeller-based propulsion is used, then flight performance can be achieved, but flight range is limited due to insufficient propulsion efficiency
Solution Approach 1:
The system pre-compresses and stores a large volume of air in a high-capacity tank before flight. This preliminary action of compressing and storing air allows the aircraft to have sufficient propulsion energy for extended flight duration and range, eliminating the need for continuous energy input from motors during flight
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 device achieves improved propulsion and extended flying range by leveraging the Coandă effect, reducing noise during operation, and enabling versatile flight modes by adjusting wing positions, thus enhancing flight performance and reducing noise pollution.
Implementation Method 1
compression motors provided in the main body so as to form compressed air
Implementation Method 2
improves propulsion through the Coandă effect and thus increases a flying range
Implementation Method 3
blowers configured to generate air flow so as to generate propulsion
Data Source
AI summary
An air mobility device improves propulsion due to the Coandă effect when flying so as to increase a flying range and reduces noise when flying.