Aircraft Engine Flow Channel Valve Friction Damping
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Solution Overview
Problem
Flow channel devices used in flight engines for mixing different gas flows face significant challenges due to vibration-induced fatigue, leading to uncertainties in component interpretation and reduced lifespan.
Innovation Solution
Incorporating a friction damping system into the valve body of the mixing device, which includes a cylindrical valve body with two valve shells that are connected in a way to absorb vibrations, thereby increasing the lifespan of the mixing device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the valve body is made rigid and stable for reliable operation, then the mixing device can maintain precise control over gas flow separation and mixing, but the component becomes more susceptible to vibration-induced fatigue and has reduced service life
Solution Approach 1:
The patent converts the harmful vibrations into beneficial friction damping by introducing a friction damping system between the valve body and valve seat. The vibrations that would normally cause fatigue damage are instead utilized to generate friction forces that dampen the oscillations, transforming the harmful effect into a useful damping mechanism that extends component service life while maintaining control reliability
2Ease of manufacture
If the valve body is designed with simple structure for ease of manufacture, then production costs are reduced, but the component lacks sufficient vibration damping capability
Solution Approach 1:
The friction damping system is designed to be self-regulating and self-serviceing. The friction forces automatically adjust based on the vibration amplitude and frequency, requiring no external control systems or complex active damping mechanisms. This maintains manufacturing simplicity while effectively addressing vibration susceptibility through the inherent friction characteristics of the valve body and seat interface
3Object-affected harmful factors
If the valve body is made massive and stiff to resist vibrations, then vibration damping improves, but the component weight increases and manufacturing complexity increases
Solution Approach 1:
The patent introduces a friction damping system as an intermediary mechanism between the valve body and valve seat. Instead of making the valve body itself massive and stiff, the friction interface acts as a mediator that dissipates vibration energy through friction forces. This approach achieves vibration resistance without increasing the mass or stiffness of the valve body, maintaining a lightweight design while effectively damping vibrations
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 friction damping system effectively absorbs vibrations, leading to an increased lifespan of the mixing device and improved reliability of the flow channel device in flight engines.
Implementation Method 1
the valve body has a friction damping system. By means of the friction damping system, the valve body can better absorb vibrations
Implementation Method 2
the valve body can better absorb vibrations, thus advantageously increasing the service life of the mixing device
Data Source
Figure 1
Figure 2
AI summary
The invention relates to a flow channel device (10) of an aircraft engine (1) for combining two different gas flows, in particular a bleed air flow and a secondary channel flow, comprising a mixing device (20) with a first inlet channel (11), a second inlet channel (12), an outlet channel (13), and a mixing area (21), wherein the mixing device (20) separates the two different gas flows in a closed state (C) and mixes the two gas flows in an open state (O), wherein the mixing device (20) has a valve body (30) movably arranged in the mixing area (21). According to the invention, a flow channel device with a longer service life is created by the valve body (30) having a friction damping system.