Exhaust Flow Diffuser Radial Struts Air Mixing
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Solution Overview
Problem
Existing exhaust pipe diffusers fail to optimally intermingle cooling air with hot exhaust gas core streams, leading to hazardous operating environments due to high exit temperatures from diesel engines with after-treatment devices.
Innovation Solution
A flow diffuser with radial struts and air channels that divide the exhaust discharge into multiple channels, introducing ambient air into the exhaust stream to promote mixing and heat dissipation, reducing temperature and velocity profiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If cooling air is fed directly through the duct wall, then cooling effect is provided, but optimal intermingling with hot core stream is not achieved
Solution Approach 1:
The exhaust stream is segmented into multiple separate exhaust streams using radial struts that extend from the duct wall toward the center, dividing the hot core stream into discrete channels that can be more effectively mixed with cooling air
Solution Approach 2:
Cooling air is introduced as an intermediary substance through air channels in the radial struts, positioned to optimally intermingle with the segmented hot exhaust streams, facilitating heat transfer and temperature reduction
2Power
If high temperature exhaust gas is discharged, then engine performance is maintained, but hazardous operating environment is created
Solution Approach 1:
Heat is extracted from the hot core exhaust stream by introducing cooling air through the radial struts, removing the harmful thermal energy while maintaining the exhaust flow and engine performance
Solution Approach 2:
The high-temperature exhaust gas, which creates hazardous conditions, is converted into a beneficial heat source that preheats the incoming cooling air, improving thermal efficiency while reducing the temperature of the discharged exhaust
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 and velocities, enhancing heat dissipation and safety by optimizing the mixing of hot exhaust gases with ambient air, as demonstrated by comparative temperature section plots showing faster and more complete heat dissipation compared to standard systems.
Implementation Method 1
introducing ambient air into the exhaust stream to promote mixing and heat dissipation
Implementation Method 2
promote mixing and heat dissipation, reducing temperature and velocity profiles
Data Source
AI summary
In a land vehicle of the type having an engine and an exhaust system including an exhaust pipe, a flow diffuser for the exhaust pipe generally includes a substantially tubular body having an outer wall, an interior, and first and second ends, the first end being an exhaust inlet configured to be attachable to an exhaust pipe, the second end being an exhaust discharge portion having an exit plane, a plurality of radial struts extending inwardly from the inner surface of the outer wall to the center of the exit plane for dividing the exhaust discharge portion divided into a plurality of exit channels, and a plurality of air channels extending from the outer wall to the interior of the tubular body configured for delivering air to the interior of the tubular body.