Exhaust Flow Diffuser for Diesel Heat Dissipation
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Solution Overview
Problem
The high temperatures generated during the regeneration cycle of diesel particulate filters in exhaust systems pose a hazardous operating environment due to excessively hot exhaust gas temperatures, exceeding 900 degrees Kelvin, which existing exhaust systems are not equipped to handle safely.
Innovation Solution
A flow diffuser is designed to attach to the exhaust pipe, featuring a tubular body with diffusion portions that include channels or slots with increasing flow areas, optimized shape factors, and spacings to reduce exhaust gas velocity and promote mixing with ambient air, thereby dissipating heat effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If exhaust after-treatment devices with regeneration cycle are used to meet emission limits, then emission control is improved, but exhaust gas temperature increases creating hazardous operating conditions
Solution Approach 1:
The exhaust flow is segmented into multiple separate streams through the use of multiple channels or slots in the diffuser, rather than discharging as a single concentrated hot plume. This segmentation distributes the thermal load and promotes faster mixing with ambient air, effectively reducing the temperature of the exhaust discharge without compromising the regeneration function.
Solution Approach 2:
The invention transitions from a conventional single-dimension exhaust discharge to a multi-dimensional diffusion structure. The exhaust gas is channeled through multiple pathways (channels or slots) that extend in different directions and orientations, creating a three-dimensional diffusion pattern that accelerates heat dissipation and reduces thermal hazards.
2Temperature
If channels increase in flow area to reduce exhaust gas velocity, then temperature reduction is improved, but device complexity increases
Solution Approach 1:
The diffuser structure implements local quality variations by having channels or slots with different geometries, orientations, and flow area expansions at different locations. Each channel is optimized locally to control flow velocity and promote mixing, while the overall structure remains relatively simple and manufacturable.
Solution Approach 2:
The invention utilizes parameter changes within the channels, specifically varying the flow area along the channel length (increasing flow area in the direction of flow), to control exhaust gas velocity. This parameter variation achieves temperature reduction through velocity control without requiring complex active control systems or multiple moving parts.
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 significantly reduces exhaust gas temperature from over 925 degrees Kelvin to less than 600 degrees Kelvin within a short distance, enhancing safety and heat dissipation by mixing hot exhaust gases with cooler air, while preventing back pressure and maintaining durability.
Implementation Method 1
a diffusion portion including at least one channel having a root end located near the outer surface, an exit port, and a channel axis extending between the root end and the exit port, the channel increasing in flow area along the channel axis to reduce exhaust gas velocity
Implementation Method 2
fluid passageways for the passage of surrounding air between adjacent channels
Implementation Method 3
The flow diffuser effectively reduces exhaust gas temperatures from over 925 degrees Kelvin to less than 600 degrees Kelvin within a short distance
Data Source
AI summary
A flow diffuser for vehicles of the type having an engine and an exhaust pipe generally includes a substantially tubular body having an outer surface and a first end configured for attachment to an exhaust pipe. The flow diffuser further includes a diffusion portion including at least one channel having a root end located near the outer surface, an exit port, and a channel axis extending between the root end and the exit port, the channel increasing in flow area along the channel axis to reduce exhaust gas velocity.