Compressor Acoustic Liner Segmentation for Leakage Control
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Solution Overview
Problem
In compressors, noise generated by rotating components can cause structural breakdown in stationary components, and existing acoustic liners may experience leakage flows due to pressure imbalances, affecting their noise-reducing effectiveness.
Innovation Solution
The compressor design includes an acoustic liner with independently provided acoustic spaces that communicate with open hole portions, arranged to reduce leakage flows and enhance noise attenuation by minimizing pressure imbalances and improving acoustic characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If acoustic holes are arranged in the acoustic liner to reduce noise, then noise attenuation is improved, but leakage flow occurs due to pressure imbalance between upstream and downstream sides
Solution Approach 1:
The acoustic liner is divided into multiple independent acoustic spaces, each associated with specific introduction holes. This segmentation prevents leakage flow from affecting all acoustic holes uniformly, as each acoustic space operates independently with its own pressure balance, thereby maintaining reliable noise attenuation performance.
Solution Approach 2:
Different acoustic spaces are configured with different characteristics (number of introduction holes, acoustic space volume, positioning) according to local pressure conditions in the exit flow channel. This allows each region of the acoustic liner to be optimized for its specific location, preventing leakage flow while maintaining effective noise attenuation.
2Object-affected harmful factors
If multiple introduction holes are formed for one acoustic space to improve noise reduction, then noise attenuation is enhanced, but leakage flow increases from downstream to upstream side
Solution Approach 1:
Instead of having one acoustic space serve multiple introduction holes from different pressure regions, the patent assigns each introduction hole to its own dedicated acoustic space. This segmentation prevents fluid leakage from high-pressure downstream regions to low-pressure upstream regions, as each acoustic space is isolated and cannot serve as a leakage path for other regions.
Solution Approach 2:
The acoustic spaces act as intermediary chambers that isolate introduction holes from each other. By inserting these intermediary acoustic spaces between introduction holes at different pressure levels, the patent prevents direct leakage flow paths while still allowing each introduction hole to function for noise attenuation.
3Object-affected harmful factors
If acoustic liner is provided in exit flow channel to prevent noise, then noise propagation is reduced, but leakage flow affects fluid flow into acoustic spaces
Solution Approach 1:
The patent configures each acoustic space with a specific number and arrangement of introduction holes tailored to its local position in the exit flow channel. Acoustic spaces at different locations have different characteristics optimized for their local pressure and flow conditions, ensuring proper fluid flow into each acoustic space while maintaining noise reduction effectiveness.
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 propagation and maintains optimal acoustic liner performance by preventing leakage flows, thereby improving noise reduction and processing efficiency.
Implementation Method 1
an acoustic liner which is provided so as to face the inside of the exit flow channel in the casing. The acoustic liner has a plurality of open hole portions which are arranged with intervals therebetween, and acoustic spaces which communicate with the open hole portions
Implementation Method 2
an impeller which press-feeds a fluid from one side in an axial direction toward an outward side in a radial direction by rotating together with the rotation shaft
Data Source
AI summary
A compressor includes a rotation shaft which rotates around an axis, an impeller which press-feeds a fluid from one side in an axial direction toward an outward side in a radial direction by rotating together with the rotation shaft, a casing which surrounds the rotation shaft and the impeller and in which an exit flow channel for introducing a fluid press-fed from the impeller is formed, and an acoustic liner which is provided so as to face the inside of the exit flow channel in the casing. The acoustic liner has a plurality of open hole portions which are arranged with intervals therebetween, and acoustic spaces which communicate with the open hole portions and are independently provided for the respective open hole portions.