Nested Reductant Delivery Tubes for Compact Exhaust Mixing
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Solution Overview
Problem
Internal combustion engines emit nitrogen oxide (NOx) compounds, necessitating a reductant delivery system to convert NOx into non-NOx emissions, but existing systems face challenges in minimizing space claim due to limited physical space availability.
Innovation Solution
A reductant delivery system with an inlet body, outlet body, and nested transfer tubes that enhance swirl and mixing length without increasing space claim, incorporating a dosing module and injection mount for efficient reductant distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the physical space for the aftertreatment system is reduced, then the space claim is minimized, but the mixing length and swirl enhancement are compromised
Solution Approach 1:
The patent implements nested transfer tubes where an inner transfer tube is positioned inside an outer transfer tube. This nesting arrangement allows the system to maintain adequate mixing length and swirl enhancement within a compact volume, effectively resolving the contradiction between minimizing space claim and maintaining sufficient mixing length for reductant distribution.
Solution Approach 2:
The patent utilizes the radial dimension by positioning transfer tubes at different radial distances from the exhaust gas flow path. The outer transfer tube is positioned farther from the exhaust gas inlet than the inner transfer tube, creating a multi-dimensional flow path that enhances mixing without increasing the overall axial length of the system.
2Volume of moving object
If the transfer tubes are positioned closer to the exhaust gas inlet, then the space claim is reduced, but the reductant distribution uniformity deteriorates
Solution Approach 1:
The nested configuration of inner and outer transfer tubes creates multiple flow paths that distribute reductant more uniformly throughout the exhaust gas stream. The inner tube handles central flow while the outer tube manages peripheral flow, ensuring consistent mixing uniformity within a compact space.
Solution Approach 2:
The patent applies different positioning strategies to different parts of the system: the inner transfer tube is positioned closer to the exhaust gas inlet for compactness, while the outer transfer tube is positioned farther away to enhance peripheral mixing. This local differentiation of tube positions ensures uniform reductant distribution throughout the entire cross-section of the exhaust flow.
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 system effectively increases mixing uniformity and reduces NOx emissions by enhancing reductant distribution within the limited space, facilitating scalable applications across various internal combustion engines.
Implementation Method 1
nested transfer tubes that enhance swirl and mixing length
Data Source
AI summary
A reductant delivery system includes an inlet body, an outlet body, and an outer transfer tube. The inlet body includes an inlet body coupler, an inlet body outer transfer shell, and an inlet body inner shell. The inlet body coupler surrounds an inlet body inlet that is configured to receive exhaust gas. The inlet body outer transfer shell is coupled to the inlet body coupler. The inlet body outer transfer shell includes an inlet body outer transfer shell inner surface and an inlet body outer transfer shell outlet. The inlet body outer transfer shell outlet extends through the inlet body outer transfer shell inner surface. The inlet body inner shell includes an inlet body inner shell first flange, an inlet body inner shell second flange, and an inlet body inner shell wall. The inlet body inner shell first flange is coupled to the inlet body outer transfer shell inner surface.