U-Shaped EGR Pre-Mixer for Homogeneous Distribution
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Solution Overview
Problem
Current exhaust gas recirculation systems face challenges in achieving uniform EGR distribution due to unsteady EGR flow, leading to high pressure losses and the need for elaborate mixers and additional components, which increase costs and reduce flow capabilities, making it difficult to meet stringent low NOx and CO2 emission requirements.
Innovation Solution
A low-pressure loss U-shaped exhaust gas mixer with a pre-mixing cavity is introduced to disperse EGR into a volume adjacent the main intake air flow, allowing for shorter mixing lengths and homogeneous EGR distribution without the need for backpressure valves or EGR pumps, thereby reducing pressure losses and system complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional exhaust gas recirculation systems are used to achieve uniform EGR distribution, then mixing effectiveness is improved, but pressure losses increase and system complexity increases
Solution Approach 1:
The mixing process is divided into two distinct stages: a pre-mixing stage in a dedicated cavity where EGR is dispersed into smaller volumes, and a final mixing stage in the intake manifold. This segmentation allows each stage to optimize for its specific function, reducing overall pressure losses while achieving uniform distribution.
Solution Approach 2:
EGR is pre-mixed with a portion of intake air in a dedicated pre-mixing cavity before entering the main intake manifold. This preliminary action creates a homogenized EGR-air mixture that mixes more efficiently with the remaining intake air, reducing the complexity and pressure losses of the final mixing process.
2Manufacturing precision
If elaborate mixers and additional components are added to improve EGR mixing, then mixing effectiveness is improved, but device complexity increases and costs increase
Solution Approach 1:
The pre-mixing cavity is integrated into the existing intake air pathway, combining the EGR injection and mixing functions within the available space rather than adding separate elaborate mixer components. This merging approach achieves improved mixing while minimizing additional system complexity.
Solution Approach 2:
The pre-mixing cavity utilizes the kinetic energy and flow characteristics of the incoming intake air to automatically disperse and mix the EGR, eliminating the need for additional active mixing components such as pumps or valves. The system serves itself through proper geometric design.
3Device complexity
If traditional EGR systems are used without pre-mixing, then system simplicity is maintained, but pressure losses increase and mixing effectiveness decreases
Solution Approach 1:
The pre-mixing cavity introduces a new spatial dimension for EGR-air interaction, creating a dedicated volume where dispersion occurs before the main mixing pathway. This dimensional addition enables effective pre-mixing while maintaining a relatively simple overall system architecture.
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 solution enables improved EGR mixing with reduced pressure losses and costs, achieving homogeneous EGR distribution across cylinders while eliminating the need for expensive EGR system components, thus enhancing engine efficiency and emission control.
Implementation Method 1
the pre-mixing cavity is configured to disperse the exhaust gas and entraining the exhaust gas into an intake air flow
Implementation Method 2
the pre-mixing cavity configured to maintain an exhaust gas flow pressure during a dispersing and entraining of the exhaust gas with the intake air
Data Source
AI summary
An exhaust gas recirculation system for an engine includes a conduit, and a U-shaped exhaust gas mixer. The conduit is configured to direct an exhaust gas away from an exhaust manifold. The U-shaped exhaust gas mixer is configured to direct exhaust gas from the conduit and into an engine air intake system. The U-shaped exhaust gas mixer is arranged with a pre-mixing cavity configured to disperse the exhaust gas and entraining the exhaust gas into an intake air flow prior to distribution into an intake manifold of an engine.