Integrated Acoustic Attenuation and Heat Exchange Structure
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Solution Overview
Problem
Dual-flow turbine engines face a trade-off between acoustic wave attenuation and heat exchange, as the implementation of heat exchangers on inner walls reduces the space allocated to acoustic structures, leading to increased turbo engine noise.
Innovation Solution
A structure with a perforated first wall, a second wall, and intermediate walls with pipes for heat exchange, where each intermediate wall is designed to optimize both acoustic attenuation and heat exchange, featuring elliptical pipes, double walls, partition walls, and fins for enhanced thermal conductivity and surface area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If heat exchangers are implemented on the inner walls of the duct, then heat exchange efficiency is improved, but the space allocated to acoustic structures is reduced, resulting in increased turbo engine noise
Solution Approach 1:
The patent combines the heat exchanger and acoustic attenuation functions into a single integrated structure. The heat exchanger is positioned within the acoustic structure, allowing both thermal exchange and noise attenuation to occur simultaneously without requiring separate components, thus resolving the space conflict between the two functions
Solution Approach 2:
The integrated structure serves multiple functions: it acts as both a heat exchanger for thermal exchange between fluids and an acoustic attenuator for reducing turbo engine noise. This multi-functionality eliminates the need for separate dedicated components for each function, thereby maintaining both heat exchange efficiency and acoustic performance
2Object-affected harmful factors
If the space for acoustic structures is increased, then turbo engine noise is reduced, but the space for heat exchangers is reduced, decreasing heat exchange efficiency
Solution Approach 1:
By merging the heat exchanger and acoustic structure into one integrated component, the patent eliminates the zero-sum game between the two functions. The heat exchanger is strategically positioned within the acoustic attenuation structure, allowing both functions to share the same spatial envelope rather than competing for separate spaces
Solution Approach 2:
The patent utilizes three-dimensional space efficiently by positioning the heat exchanger within the acoustic structure's volume rather than requiring separate linear spaces. This spatial arrangement in multiple dimensions allows both functions to coexist without reducing either's 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 structure effectively integrates acoustic wave attenuation and heat exchange functions, reducing turbo engine noise while maintaining efficient thermal exchange, even under mechanical loads, by optimizing pipe placement and surface area for improved fluid flow and heat transfer.
Implementation Method 1
a structure ensuring attenuation of acoustic waves generated by the flow of a first fluid
Implementation Method 2
The cavities form quarter wave resonators which attenuate a specific frequency
Implementation Method 3
allowing heat exchange between the first fluid and a second fluid
Implementation Method 4
provides a thermal exchange between this first fluid and a second fluid
Implementation Method 5
heat exchange between the first fluid and a second fluid
Data Source
AI summary
A structure ensuring acoustic attenuation of a flow of a first fluid and heat exchange between a first fluid and a second fluid. The structure includes a first wall which is perforated, a second wall, and a plurality of intermediate walls extending between the first wall and the second wall. For each intermediate wall, there is a pipe intended to receive the second fluid and inscribed within the intermediate wall. Such a structure makes it possible to optimally integrate the acoustic wave attenuation function and the heat exchange function.