Aircraft Air Ejector Structure Using a Secondary-Flow Vaned Rotor
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Solution Overview
Problem
Existing air-conducting structures in aircraft are complex, requiring electrical drives and are susceptible to faults, making them unsuitable for environments with extreme conditions and noisy, while conventional ejector pumps lack efficiency and maintenance-freeness.
Innovation Solution
A simple air-conducting structure with a vaned rotor driven by a secondary air stream, eliminating the need for electrical drives and enhancing efficiency through mechanical means, allowing for robust operation and reduced noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ejector pumps with electrical drives are used, then air streams can be conducted and ejected, but the device complexity increases and susceptibility to faults arises
Solution Approach 1:
The patent removes the electrical drive and motor components from the ejector pump system, extracting the problematic elements that caused faults and complexity. The system now relies solely on aerodynamic interactions between air streams, eliminating electrical components that require maintenance and can fail.
Solution Approach 2:
The ejector pump utilizes the kinetic energy of the second air stream to self-drive the vaned rotor, creating a self-service system that requires no external power source or electrical drive. The second air stream automatically drives the rotor to compress and eject the first air stream, making the system self-sufficient and fault-free.
2Object-affected harmful factors
If electrical drives are used in air-conducting structures, then air streams can be effectively controlled, but noise increases making them unsuitable for use near aircraft cabins
Solution Approach 1:
The patent replaces electrical drive mechanisms with a purely aerodynamic mechanical system. The vaned rotor is driven by the kinetic energy of the second air stream rather than an electrical motor, eliminating electromagnetic noise and mechanical vibrations associated with electrical drives while maintaining effective air stream control.
3Productivity
If conventional air-conducting structures are used, then air can be conducted, but heat transfer efficiency and mass flow are insufficient
Solution Approach 1:
The patent introduces a dynamic vaned rotor that actively compresses and accelerates the first air stream, transforming the static duct system into a dynamic flow control system. This dynamic action increases mass flow rate and enhances heat transfer efficiency by creating higher velocity gradients and turbulence in the air stream.
Solution Approach 2:
The system uses pneumatic principles where the second air stream drives the vaned rotor to compress the first air stream. This pneumatic compression mechanism efficiently increases the energy and mass flow of the first air stream, improving heat transfer without the energy losses associated with electrical motors.
4Power
If dimensions of ejector pump are increased to achieve higher power, then air throughput increases, but the device becomes larger and more complex
Solution Approach 1:
The patent optimizes the geometric parameters of the vaned rotor and duct configuration to achieve high air throughput in a compact design. By carefully selecting blade angles, rotor diameter, and duct cross-sections, the system achieves high power output without proportionally increasing volume, maintaining a favorable power-to-size ratio.
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 structure achieves higher mass flow and heat transfer efficiency with reduced noise and susceptibility to faults, enabling use in extreme environments and near aircraft cabins, while maintaining or increasing power without increasing dimensions.
Implementation Method 1
a vaned rotor (130), which is arranged in the first duct portion (110) such that it can be driven by means of the second air stream (121)
Implementation Method 2
the vaned rotor (130) can be driven solely by the second air stream (121) and therefore does not require any further drive
Data Source
Figure 1~2
Figure 3~4
AI summary
The present invention proposes an air-conducting structure (100) for an aircraft. The air-conducting structure (100) has a first duct portion (110), which is configured to conduct a first air stream (111), a second duct portion (120), which opens into the first duct portion (110) and is configured to conduct a second air stream (121), and a vaned rotor (130), which is arranged in the first duct portion (110) such that it can be driven by means of the second air stream (121). The air-conducting structure (100) can be used as or in an air ejector or ejector pump.