Exhaust Gas Mixing Deflection Element Design
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Solution Overview
Problem
Existing exhaust gas mixing technologies face limitations in achieving uniform mixing of exhaust gases and fluids across the entire profile of exhaust gas pipes, particularly in curved pipes, leading to inefficient mixing and potential coating issues.
Innovation Solution
A method involving a deflection element with a sheet metal part raised at an angle within the exhaust gas pipe, which diverts the exhaust gas flow and fluid injection, allowing for central injection at an angle that can vary between 270° and 360°, ensuring the fluid is distributed evenly across the pipe profile before impacting a static mixer, utilizing correction plates and fins to stabilize and divert the fluid flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a wall structure with flow guidance surfaces is provided to fill the profile of the housing, then mixing is achieved, but dynamic pressure loss increases significantly
Solution Approach 1:
The wall structure is divided into multiple layers of undulating strip material stacked transverse to the flow direction, creating multiple flow paths and reducing resistance while maintaining mixing effectiveness
Solution Approach 2:
The strip material features round undulations rather than sharp edges, creating smoother flow guidance surfaces that reduce turbulence and dynamic pressure loss while still achieving effective mixing
2Adaptability or versatility
If the exhaust gas pipe is curved to fit installation space, then installation flexibility is improved, but mixing uniformity deteriorates
Solution Approach 1:
The deflection element is positioned specifically at the injection point to locally correct flow non-uniformities caused by curved pipe geometry, ensuring uniform fluid distribution across the pipe profile regardless of overall pipe curvature
Solution Approach 2:
The deflection element pre-diverts the fluid flow and exhaust gas before they reach the static mixer, ensuring that both flows are uniformly distributed across the entire pipe profile before mixing occurs
3Ease of operation
If fluid is injected at a standard angle into the exhaust gas pipe, then injection simplicity is maintained, but fluid distribution uniformity across the pipe profile is insufficient
Solution Approach 1:
The deflection element is positioned upstream to pre-divert and distribute the fluid flow across the entire pipe profile before the fluid reaches the static mixer, ensuring uniform distribution without complicating the injection process
Solution Approach 2:
The deflection element acts as an intermediary between the injection device and the static mixer, correcting flow non-uniformities and preparing both fluid and exhaust gas for effective mixing
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 method enhances the mixing efficiency of exhaust gases and fluids across the entire exhaust gas pipe profile, even in curved configurations, by ensuring uniform distribution and stabilization of the fluid flow, leading to improved mixing and reduced coating issues.
Implementation Method 1
by means of at least one sheet metal part which is provided on the deflection element and which is raised with reference to the direction of flow at least partially at an angle sv, the exhaust gas flow is partially diverted with reference to the direction of flow from its direction of flow into a central direction of distribution
Implementation Method 2
the fluid is carried along at least partially by the diverted part of the exhaust gas flow in the direction of distribution before and after impacting the deflection element, and is diverted by the raised sheet metal part into the direction of distribution
Data Source
AI summary
The invention relates to a method for mixing an exhaust gas flow with a fluid in an exhaust gas pipe 40 of an exhaust gas system 4, in which the fluid is injected by means of an injection device 5 into the exhaust gas pipe 40. The exhaust gas flow is guided in the exhaust gas pipe 40 in the area of the injection device 5 in a direction of flow S parallel to the exhaust gas pipe 40. The fluid is injected directly onto a deflection element 6 which is arranged in the exhaust gas pipe 40 in a central direction of injection E which deviates from the direction of flow S by an angle se, wherein by means of at least one sheet metal part 60 which is provided on the deflection element 6 and which is raised at least partially at an angle sv with reference to the direction of flow S, the exhaust gas flow is diverted with reference to the direction of flow S from its direction of flow S into a central direction of distribution V. Before and after it impacts the deflection element 6, the fluid is carried along at least partially by the diverted part of the exhaust gas flow into the direction of distribution V and is diverted into the direction of distribution V by the raised sheet metal part 60.