Curved Diffuser Plate for Exhaust Flow Uniformity
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Solution Overview
Problem
The design restrictions in exhaust aftertreatment systems often result in a reduced distance between the inlet port and the exhaust substrate, leading to non-uniform exhaust gas flow and degraded performance, as the existing systems struggle to maintain flow uniformity and efficiency.
Innovation Solution
The exhaust aftertreatment system incorporates a tapered inlet with a curved diffuser plate having perforations that distribute the exhaust mixture radially outward across the substrate, ensuring uniform flow and reducing backpressure, even with minimized distances between components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the distance between the inlet port and the exhaust substrate is reduced to save space, then the available space for the exhaust ATS is improved, but the uniformity of exhaust gas flow deteriorates
Solution Approach 1:
The diffuser plate is positioned upstream of the exhaust substrate to pre-condition the exhaust gas flow before it reaches the substrate. The plate creates a controlled expansion region that promotes flow uniformity in advance, allowing the inlet port to be placed closer to the substrate while maintaining adequate flow distribution.
Solution Approach 2:
The diffuser plate features a curved surface that expands outward from the inlet port toward the exhaust substrate. This curvature creates a gradual flow expansion that redistributes the exhaust gas uniformly across the substrate face, compensating for the reduced distance between inlet and substrate.
2Volume of moving object
If the distance between the inlet port and the exhaust substrate is reduced, then the space utilization is improved, but the performance of the exhaust ATS deteriorates
Solution Approach 1:
The diffuser plate preconditions the flow upstream of the substrate, ensuring uniform distribution before the exhaust gas contacts the catalytic material. This preliminary flow conditioning maintains substrate utilization efficiency and treatment performance despite the compact configuration.
Solution Approach 2:
The diffuser plate acts as an intermediary component between the inlet port and the exhaust substrate. It mediates the flow transition by creating an expansion region that redistributes the exhaust gas, allowing the inlet to be positioned closer to the substrate without compromising substrate exposure effectiveness.
3Stability of the object's composition
If a diffuser plate with curved surface is introduced to improve flow distribution, then the flow uniformity is improved, but the device complexity increases
Solution Approach 1:
The diffuser plate performs multiple functions within a single component: it expands the flow area, redistributes the exhaust gas uniformly, and conditions the flow before substrate contact. This multi-functionality achieves improved flow distribution without requiring multiple separate components, thereby limiting the increase in device complexity.
Solution Approach 2:
The curved surface of the diffuser plate is formed as a simple geometric feature that can be manufactured in a single piece. The curvature provides the necessary flow expansion and redistribution while maintaining a straightforward structural form that does not significantly complicate the inlet assembly.
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 maintains uniform flow and enhances the performance of the exhaust aftertreatment system by distributing the exhaust mixture uniformly across the substrate, optimizing space usage and reducing backpressure, thus improving the treatment efficiency of emission compounds.
Implementation Method 1
The plurality of perforations distribute a portion of the exhaust mixture radially outward across the inlet surface of the canister of the exhaust substrate based on the curved surface of the diffuser plate
Implementation Method 2
The exhaust inlet includes a tapered portion between a first portion connecting the tapered portion to the inlet port and a second portion connecting the tapered portion to a canister of an exhaust substrate
Data Source
AI summary
A component of the exhaust aftertreatment system includes a metallic body having a tapered portion. The component of the exhaust aftertreatment system further includes a curved plate arranged within the tapered portion of the metallic body. The curved plate has a plurality of perforations disposed on the curved plate to facilitate distribution of an exhaust mixture flowing through the curved plate across a surface of a substrate.