Variable Stator Blade-Stator System for VTOL Duct Pressure Loss
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Solution Overview
Problem
In vertical take-off and landing flight apparatuses, significant pressure loss occurs due to swirl flow at the outlet of the duct, especially when the pitch angle of the rotor blade is changed, leading to increased swirl angle and pressure loss, which affects performance.
Innovation Solution
A blade-stator system where the angle of the stator assembly is linked to the blade body's angle change, utilizing a fixed and variable stator configuration with a controller to adjust the stator assembly's angle in response to electrical signals, reducing pressure loss and minimizing the peeling phenomenon.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pitch angle of the rotor blade is changed to improve flight performance, then the lift generation capability is improved, but the swirl angle increases and pressure loss increases
Solution Approach 1:
The stator assembly is designed to be rotatable relative to the duct, allowing its angle to dynamically adjust in response to changes in the rotor blade's pitch angle. This dynamic configuration enables the stator to optimize the airflow direction at different operating conditions, reducing pressure loss while maintaining lift generation capability.
Solution Approach 2:
The invention changes the angular parameter of the stator assembly to match the pitch angle changes of the rotor blade. By coordinating the stator's angle with the blade's pitch angle, the system optimizes airflow characteristics and reduces pressure loss without compromising lift generation.
2Ease of operation
If the swirl angle is increased to improve thrust direction control, then the flight maneuverability is improved, but the pressure loss at the duct outlet increases
Solution Approach 1:
The stator assembly's rotatable design allows it to dynamically adjust its angle in coordination with the rotor blade's pitch angle changes. This dynamic adjustment optimizes the de-swirl function at different maneuvering conditions, reducing pressure loss while maintaining thrust direction control capability.
3Device complexity
If a fixed-type strut is used to support the lift rotor, then the structural simplicity is maintained, but significant pressure loss occurs due to swirl flow downstream
Solution Approach 1:
The stator assembly is designed to rotate relative to the duct, transforming the fixed support structure into a dynamic flow control system. This allows the stator to actively manage the swirl flow downstream of the rotor, significantly reducing pressure loss while maintaining structural feasibility.
Solution Approach 2:
The stator assembly acts as an intermediary component between the rotor and the duct outlet, managing the swirl flow generated by the rotor. By introducing this intermediate flow control element, the system reduces pressure loss without fundamentally redesigning the entire support structure.
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 configuration effectively reduces pressure loss and improves de-swirl function, ensuring excellent performance even with changes in the pitch angle and operating conditions of the flight apparatus.
Implementation Method 1
a blade assembly installed rotatably inside the duct and including a blade body of which an angle is changeable
Implementation Method 2
the angle of the stator assembly is changed in response to receiving an electrical signal from the controller so as to be interlocked with a change of the angle of the blade body
Data Source
AI summary
Embodiments of the present disclosure provide a blade-stator system and the vertical take-off and landing flight apparatus comprising the blade-stator system, the blade-stator system including a duct disposed inside a flight body, upper and lower sides of the duct being open, and an inside of the duct being hollow; a blade assembly installed rotatably inside the duct and including a blade body of which an angle is changeable; a stator assembly connected to the blade assembly and the duct, supporting the blade assembly, and rotatable by a predetermined angle; a controller electrically connected to the blade assembly and the stator assembly and configured to control driving of the blade body and the stator assembly, wherein the angle of the stator assembly is changed in response to receiving an electrical signal from the controller so as to be interlocked with a change of the angle of the blade body.