Gas Turbine Combustor Acoustic Device Bypass
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Solution Overview
Problem
In acoustic devices with a multiple-story configuration in gas turbines, there is a challenge in preventing acoustic coupling between the first and second acoustic devices while allowing communication between the first cavity and the outer space of the combustion cylinder.
Innovation Solution
A combustor component design that includes a first acoustic device with a first cavity communicating through a first through hole, a second acoustic device with a second cavity communicating through a second through hole, and a first communication passage that connects the first cavity directly to the outer space without going through the second cavity, thereby preventing acoustic coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the first cavity communicates with the outer space via the second cavity, then the communication path is simplified, but acoustic coupling between the first and second acoustic devices occurs
Solution Approach 1:
The communication path is segmented into two independent paths: one for fuel discharge (through the second cavity and second through hole) and another for acoustic isolation (first communication passage bypassing the second cavity). This segmentation allows the system to achieve both communication functionality and acoustic isolation by separating the flow path from the acoustic path.
Solution Approach 2:
The first communication passage acts as an intermediary path that allows the first cavity to communicate with the outer space without passing through the second cavity. This intermediary structure enables acoustic isolation while maintaining the necessary communication function for fuel discharge and purging air introduction.
2Ease of manufacture
If the first acoustic device and second acoustic device are acoustically coupled, then the structural simplicity is maintained, but the acoustic performance deteriorates due to unwanted coupling
Solution Approach 1:
Different parts of the acoustic device system are given different qualities: the first and second acoustic devices maintain their individual acoustic characteristics by preventing sound wave transmission between them, while still allowing fluid communication. The first communication passage provides a fluid path without acoustic coupling, creating local acoustic isolation where needed.
Solution Approach 2:
The communication function is moved to a different dimension (fluid flow dimension) separate from the acoustic dimension. The first communication passage allows fluid communication between the first cavity and outer space while being acoustically isolated from the second cavity, effectively separating the two functional dimensions.
3Object-affected harmful factors
If a direct communication passage is added between the first cavity and outer space, then acoustic coupling is suppressed, but the device complexity increases
Solution Approach 1:
The first communication passage serves multiple functions: it provides a path for uncombusted fuel discharge, enables purging air introduction, and prevents acoustic coupling between the first and second acoustic devices. By making this single passage multi-functional, the need for separate components is reduced, offsetting the complexity increase with functional consolidation.
Solution Approach 2:
The functions of fuel discharge, purging air introduction, and acoustic isolation are merged into a single integrated structure (the first communication passage). This merging reduces the number of separate components needed, as the same passage that provides fluid communication also serves as an acoustic barrier by bypassing the second cavity.
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 design allows for effective communication between the first cavity and the outer space while suppressing acoustic coupling between the first and second acoustic devices, enabling efficient discharge of uncombusted fuel or introduction of purging air without complicating the formation process.
Implementation Method 1
there is a problem that the first acoustic device and the second acoustic device are acoustically coupled, if it is configured such that the first cavity communicates with the outer space via a resonance space (second cavity) of the second acoustic device
Data Source
AI summary
A combustor component of a combustor for combusting fuel to produce a combustion gas includes a combustion cylinder forming a passage for the combustion gas, a first acoustic device which internally includes a first cavity communicating with the passage via a first through hole formed in the combustion cylinder, a second acoustic device which is located on a radially outer side of the first acoustic device so as to cover the first acoustic device, and internally includes a second cavity communicating with the passage via a second through hole formed in the combustion cylinder, and a first communication passage causing the first cavity and an outer space of the combustion cylinder to communicate with each other without via the first through hole and the second cavity.