Truck Exhaust Diffuser with Coanda Guide Plate for Gas Cooling
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Solution Overview
Problem
Existing exhaust systems for trucks with particulate filters face challenges in rapidly cooling exhaust gases during regeneration to prevent damage to the truck, environment, and nearby individuals, as current temperature reduction methods are insufficient.
Innovation Solution
An exhaust device with a diffuser having a cylindrical housing, an elongated outlet opening, and a bent guide plate that utilizes the Coanda effect to deflect and mix exhaust gases with ambient air, enhanced by ribs and suction openings to improve gas flow and mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If exhaust gas is blown out on the side of the truck to prevent damage to the truck, then the temperature of the exhaust gas must be lowered to prevent environmental damage and harm to persons, but the known devices are insufficient in lowering the temperature adequately
Solution Approach 1:
The exhaust gas flow is segmented into multiple streams by dividing the outlet opening into multiple sections (first outlet opening and second outlet opening). This segmentation increases the surface area for heat dissipation and improves mixing with ambient air, thereby effectively lowering the exhaust gas temperature to prevent environmental damage and harm to persons.
Solution Approach 2:
The exhaust gas is directed along a bent wall (three-dimensional path) rather than being discharged in a straight line. This dimensional change allows the exhaust gas to travel a longer path, increasing exposure time to ambient air for cooling, and directs the cooled gas away from the truck and surrounding environment, preventing damage and harm.
2Temperature
If the temperature of exhaust gas is lowered by mixing with ambient air, then the harmful effects are reduced, but the gas stream velocity remains high which limits mixing efficiency
Solution Approach 1:
The outlet opening is segmented into multiple sections, creating multiple smaller gas streams instead of one large high-velocity stream. This segmentation reduces the velocity of each individual stream, allowing more effective mixing with ambient air and better temperature reduction.
Solution Approach 2:
The exhaust gas is directed to flow along a bent wall in a three-dimensional path rather than discharge linearly. This dimensional change increases the path length and exposure time to ambient air, reducing gas stream velocity through extended mixing and improving temperature reduction efficiency.
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
Effectively reduces exhaust gas temperature by slowing the gas stream and enhancing mixing with ambient air, minimizing the risk of environmental and personal harm.
Implementation Method 1
By directing the outflow direction of the exhaust gas along a bent wall, the gas stream, as a result of the Coanda effect, is partly deflected along the wall and the jet widens so that a better mixing with the ambient air takes place.
Implementation Method 2
A diffuser is understood to be a mechanical device that lowers the speed of a gas stream and improves the mixing of the gas stream with ambient air.
Implementation Method 3
the exhaust gas is strongly increased. The exhaust gas is blown out on the side of the truck to prevent it causing damage to the truck. The temperature of the exhaust gas should be lowered as much as possible
Data Source
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AI summary
A device for use in a truck for lowering the temperature of exhaust gas of a combustion engine has a diffuser 1, which is provided with a cylindrical housing 3 provided with an inlet opening 5 in an end wall 7 and an elongated axially extending outlet opening 9 in the cylinder wall. The device furthermore has a bent guide plate 25 which extends from the outlet opening 9, so that, as a result of the Coanda effect, the hot exhaust gas is diverted along the plate and the jet widens, so that a better mixing with the ambient air, and hence greater cooling, takes place.