Wavy Exhaust Flow Distributor Plate Thermal Stress Management
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Solution Overview
Problem
Conventional flow distributors in exhaust systems of combustion engines are susceptible to failure and warping due to high thermal loads, leading to underutilization of catalyst or filter surface area and reduced effectiveness in NOx and particulate matter emission reduction.
Innovation Solution
A flow distributor with a plate featuring a wave formation, including peaks, valleys, and perforations, which distributes exhaust fluid streams evenly and is designed to withstand thermal stresses through mechanical stress distribution, enhancing resilience to thermal expansion and contraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a planar or dome-shaped front face flow distributor is used, then the structure is simple, but the exhaust air flow does not cover the entire catalyst or filter surface and the component is susceptible to failure or warping from high thermal loads
Solution Approach 1:
The flow distributor employs a wavy or corrugated plate structure with alternating peaks and valleys, replacing the conventional planar or simple dome shape. This curved, undulating geometry provides thermal expansion accommodation while maintaining structural integrity, preventing warping and failure under high thermal loads in the exhaust system environment.
Solution Approach 2:
The invention changes the geometric parameters of the flow distributor plate by introducing a wavy profile with specific peak-to-valley dimensions. This parameter modification allows the structure to dynamically respond to thermal expansion while maintaining its flow distribution function, thereby improving reliability without significantly complicating manufacturing.
2Device complexity
If conventional flow distributors are used, then the structure is simple, but the catalyst or filter surface area is underutilized
Solution Approach 1:
The wavy plate geometry with alternating peaks and valleys creates a more complex flow path that distributes exhaust air more uniformly across the entire catalyst or filter surface. This undulating structure ensures complete surface coverage, maximizing the utilization of catalyst or filter area for emission reduction, while the manufacturing process remains relatively straightforward.
3Temperature
If the flow distributor plate is subjected to high thermal loads, then thermal expansion occurs, but this leads to warping and failure
Solution Approach 1:
The wavy or corrugated plate structure is specifically designed to accommodate thermal expansion. The undulating geometry with peaks and valleys allows the plate to expand and contract in a controlled manner without developing excessive stresses that would cause warping or failure. This pre-designed expansion capability maintains structural stability under high thermal loads.
Solution Approach 2:
The curved wavy profile of the plate provides inherent flexibility to handle thermal expansion. The alternating peaks and valleys create a structure that can deform elastically under thermal stress, preventing permanent warping and maintaining structural integrity throughout the thermal cycling experienced in exhaust systems.
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 flow distributor achieves improved durability and longer life expectancy by offsetting thermal stresses with mechanical stresses, ensuring even distribution of exhaust fluids and maximizing catalyst or filter surface utilization, thereby enhancing emission reduction efficiency.
Implementation Method 1
designed to withstand thermal stresses through mechanical stress distribution, enhancing resilience to thermal expansion and contraction
Implementation Method 2
resilience to thermal expansion and contraction
Implementation Method 3
distributes exhaust fluid streams evenly, ensuring even distribution of exhaust fluids
Data Source
AI summary
A flow distributor provided within an exhaust system for a combustion engine configured to generate an exhaust fluid stream. The flow distributor comprising an inlet, and a plate. The plate having at least one perforation defining an outlet, a first peak and a second peak spaced from the first peak.