Turbocharger Exhaust Dosing Layout Using Turbine Swirl Mixing
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Solution Overview
Problem
Existing exhaust gas aftertreatment systems for internal combustion engines face challenges in reducing nitrogen oxide (NOx) emissions due to limited physical space and the need for additional components, such as mixers, which increase complexity and backpressure, while complying with environmental regulations.
Innovation Solution
An exhaust gas aftertreatment system that includes a turbocharger with a turbine, an injection housing downstream of the turbine, a bypass system, and a dosing module with an injector, utilizing the turbine's swirl to enhance mixing of reductant and exhaust gas, eliminating the need for additional mixers and optimizing space usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a mixer is added to enhance reductant and exhaust gas mixing, then mixing efficiency is improved, but device complexity and backpressure increase
Solution Approach 1:
The system utilizes the turbine's own swirl flow to perform the mixing function that would otherwise require a separate mixer device. The swirl generated by the turbine naturally enhances mixing of reductant and exhaust gas without requiring additional mixing components, thereby improving mixing efficiency while avoiding increased device complexity and backpressure
2Manufacturing precision
If a mixer is added to enhance reductant and exhaust gas mixing, then mixing efficiency is improved, but backpressure increases
Solution Approach 1:
The turbine's swirl flow is harnessed to provide the mixing action, eliminating the need for a separate mixer that would create additional backpressure. The natural swirl generated in the exhaust flow provides sufficient mixing enhancement without requiring additional pressure drops across mixing components
3Manufacturing precision
If additional components are added to the system, then mixing capability is improved, but physical space requirements increase
Solution Approach 1:
The mixing function is merged with the existing turbine component by utilizing its swirl flow. Instead of adding a separate mixer that would occupy additional space, the system combines the mixing capability within the existing turbine housing and exhaust flow path, thereby improving mixing capability without increasing physical space requirements
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 reduces NOx emissions by enhancing mixing efficiency, minimizing space requirements, and reducing backpressure, thus improving engine performance and compliance with environmental regulations.
Implementation Method 1
utilizing the turbine's swirl to enhance mixing of reductant and exhaust gas
Data Source
AI summary
An exhaust gas system includes: an engine-turbine exhaust gas conduit configured to receive exhaust gas from an engine; a turbocharger including a turbine coupled to the engine-turbine exhaust gas conduit; an injection housing coupled to the turbine and centered on an injection housing axis; a dosing module coupled to the injection housing and including an injector configured to dose reductant into the injection housing, the injector centered on an injector axis; and a bypass system including: a bypass inlet conduit coupled to the engine-turbine exhaust gas conduit, a bypass valve coupled to the bypass inlet conduit, and a bypass outlet conduit coupled to the bypass valve, the bypass outlet conduit centered on a bypass outlet conduit axis.