Ruffled Heat Exchanger Fairing for Thermal Stress Relief
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
High temperature heat exchangers experience large thermal stresses due to differential thermal expansion and contraction, leading to potential failure from stress accumulation at points of attachment and throughputs between hot and cold sides.
Innovation Solution
A heat exchanger fairing with a flexible region configured to change dimensions in response to thermal expansion and contraction, incorporating a ruffle shape with periodic waves to accommodate differential expansion, and a flexible region constructed from diverse materials to maintain structural integrity and pressure boundaries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the heat exchanger operates at high temperature, then heat exchange efficiency is improved, but thermal stress increases causing potential failure
Solution Approach 1:
The fairing transitions from a rigid structure to a dynamic structure with flexible regions that can change shape in response to thermal expansion. The flexible region allows the fairing to dynamically adapt to dimensional changes caused by high temperature operation, preventing stress accumulation that would compromise structural reliability.
Solution Approach 2:
The fairing incorporates a flexible region with a ruffle-shaped configuration that acts as a flexible element. This flexible region can expand and contract in response to thermal changes, allowing the fairing to accommodate differential thermal expansion between the heat exchanger core and the fairing itself, thereby maintaining structural integrity at high temperatures.
2Strength
If the fairing is made rigid to maintain structural integrity, then strength is improved, but thermal expansion accommodation is reduced
Solution Approach 1:
The fairing employs a composite structure where different regions have different properties. The majority of the fairing maintains rigid characteristics for structural support, while specific localized regions incorporate flexible elements with ruffle shapes that provide thermal expansion accommodation. This local differentiation allows the fairing to simultaneously achieve strength and thermal adaptability.
Solution Approach 2:
The fairing structure combines rigid materials with flexible regions, creating a composite structure. The flexible region may use materials or configurations (such as ruffle shapes) that provide elasticity and thermal expansion capability, while the rest of the fairing uses stronger, more rigid materials to maintain overall structural integrity and pressure containment.
3Stress or pressure
If the fairing wall is made flexible to accommodate thermal expansion, then thermal stress is reduced, but structural support capability is reduced
Solution Approach 1:
The fairing wall is segmented into distinct rigid and flexible regions. The flexible region with ruffle shapes is specifically positioned to handle thermal expansion, while adjacent rigid regions provide structural support. This segmentation allows each region to perform its specialized function without compromising the other, reducing thermal stress while maintaining overall structural capability.
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 flexible fairing design allows the heat exchanger to operate at higher temperatures and pressures while preventing overstressing and maintaining structural support, accommodating thermal expansion and contraction without failure.
Implementation Method 1
a flexible region configured to change at least one dimension responsive to thermal expansion or contraction of a heat exchanger
Implementation Method 2
the fairing is configured to maintain a predetermined interior pressure within a heat exchanger interior
Data Source
AI summary
A heat exchanger fairing including a fairing wall comprising a flexible region configured to change at least one dimension responsive to thermal expansion or contraction of a heat exchanger.