Fuel Cell Silencer Branch Pipe Acoustic Interference
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Solution Overview
Problem
Conventional fuel cell systems face challenges in reducing noise and pressure pulsation caused by the air supplier, leading to increased size, cost, and pressure loss, while existing solutions inadequately address these issues.
Innovation Solution
A fuel cell system configuration that includes a silencer arranged in a branch portion of the air passage between the flow rate sensor and the air supplier, utilizing a Helmholtz or branch pipe silencer to reduce noise and pressure pulsation by interfering with acoustic waves, thereby maintaining efficient air flow and reducing device size and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a noise blocking wall is attached to the exterior of the fuel cell system, then noise is reduced, but device size and cost increase
Solution Approach 1:
The noise blocking function is extracted from the exterior structure and integrated into the air passage system through a silencer component, eliminating the need for separate external noise blocking walls and reducing overall device size
Solution Approach 2:
A silencer is introduced as an intermediary component within the air passage to reduce noise from the air supplier, providing noise control without requiring external noise blocking structures
2Object-affected harmful factors
If a silencer is attached to an air inlet, then noise is reduced, but device size and cost increase
Solution Approach 1:
The silencer is merged with the existing air passage structure rather than being attached as a separate component, integrating noise reduction functionality into the system's existing framework and reducing overall device complexity and cost
Solution Approach 2:
The air passage structure serves multiple functions: air flow transport and noise reduction through the integrated silencer, eliminating the need for separate noise control components and reducing device cost
3Object-affected harmful factors
If the cross-sectional area of an air inlet passage is reduced, then noise escaping from the exterior is reduced, but pressure loss of the air passage increases
Solution Approach 1:
The air supplier's noise and pressure pulsation, which are harmful effects, are converted into a controlled acoustic phenomenon within the silencer where resonance at specific frequencies reduces noise while maintaining air flow pressure
Solution Approach 2:
The silencer changes the acoustic parameters of the air flow by creating resonance at specific frequencies, transforming harmful broad-spectrum noise into controlled frequency-specific acoustic behavior that reduces noise without increasing pressure loss
4Object-affected harmful factors
If a resonance silencer is provided in the air passage, then noise at specific frequencies is reduced, but pressure pulsation issues are not sufficiently addressed
Solution Approach 1:
The resonance silencer creates a feedback mechanism where pressure pulsation from the air supplier is reflected back and interferes with incoming pressure waves, reducing overall pressure pulsation amplitude and improving system reliability
Solution Approach 2:
The silencer utilizes controlled mechanical vibration and acoustic resonance to counteract harmful pressure pulsations, transforming the air supplier's vibrations into beneficial interference patterns that reduce overall system vibration and improve reliability
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 noise and pressure pulsation at specific frequencies, ensuring high-efficiency operation and reliability of the fuel cell system while preventing increased pressure loss and device size, even when using pumps that induce noise and pressure pulsation.
Implementation Method 1
a silencer arranged in a branch portion of an air passage between a flow rate sensor and an air supplier in a fuel cell system. The silencer may be a Helmholtz silencer or a branch pipe silencer
Implementation Method 2
reducing noise and pressure pulsation by interfering with acoustic waves
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A fuel cell system (100) includes a fuel cell (4), an air supplier (3) that supplies air to a cathode of the fuel cell (4), a flow rate sensor (2) that senses an air flow rate, and a silencer (5) that reduces sound of a certain frequency through interference of an acoustic wave, the flow rate sensor (2), the air supplier (3), and the fuel cell (4) being arranged in an air passage (6) in series in order named from an upstream side of flow of the air, the silencer (5) being arranged in a branch portion (16) of the air passage (6), the branch portion (16) being between the flow rate sensor (2) and the air supplier (3).