Exhaust Gas Diffuser with Diversion Wings
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Solution Overview
Problem
Existing exhaust pipe diffusers fail to optimally mix cooling ambient air with hot exhaust gas, leading to hazardous high temperatures at the exit plane due to passive cooling methods that do not effectively intermingle air with the hot core stream.
Innovation Solution
A flow diffuser with a body having diversion wings and diffusion sections that redirect and diffuse exhaust gas downwardly and outwardly, promoting turbulence and mixing with ambient air to reduce temperature and velocity profiles, utilizing elongated slots with optimized shape factors and spacing for enhanced heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If passive cooling ambient air is fed directly through the duct wall, then cooling effect is achieved, but effective intermingling with hot core stream is insufficient resulting in high exit temperatures
Solution Approach 1:
The exhaust flow is segmented into multiple streams using diversion wings that split the hot core stream from the cooling ambient air. This segmentation allows independent control and optimization of each stream's path, enabling better mixing at the exit while maintaining cooling effectiveness.
Solution Approach 2:
The patent introduces a radial dimension to the mixing process by feeding cooling air through the duct wall and using diversion wings to create radial outflow patterns. This transforms the mixing from a simple axial process to a multi-dimensional flow pattern that enhances intermingling between hot and cool streams.
2Temperature
If cooling air is introduced to reduce temperature, then heat dissipation improves, but exhaust gas velocity may increase causing back pressure
Solution Approach 1:
The diversion wings are designed to dynamically adjust the flow distribution between the hot core stream and cooling ambient air. By optimizing the wing geometry and positioning, the system dynamically balances temperature reduction with velocity control, preventing back pressure while achieving effective cooling.
Solution Approach 2:
The patent changes key flow parameters including temperature, velocity, and pressure distribution through the diversion wing design. By carefully controlling the ratio of cooling air to exhaust gas and optimizing the mixing section geometry, the system achieves temperature reduction while maintaining velocity within acceptable limits to prevent back pressure.
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 flow diffuser effectively reduces exhaust gas temperatures from over 900 degrees Kelvin to less than 600 degrees Kelvin within a short distance, enhancing heat dissipation and safety by promoting rapid mixing and diffusion with ambient air, while maintaining or reducing exhaust gas velocity to prevent back pressure.
Implementation Method 1
the diversion wings configured to increase exhaust gas turbulence and to direct exhaust downwardly through the first diffusion section and outwardly through the second diffusion section
Implementation Method 2
a diffusion portion including first and second diffusion sections... elongated slots with optimized shape factors and spacing for enhanced heat dissipation
Implementation Method 3
promoting rapid mixing and diffusion with ambient air to reduce temperature and velocity profiles... enhances heat dissipation
Data Source
AI summary
A flow diffuser for vehicles of the type having an engine and an exhaust pipe generally includes a body having a first end configured for attachment to an exhaust pipe, and a diffusion portion including first and second diffusion sections, and a plurality of diversion wings disposed within the body.