Angled Diffuser Plate for EGR Mixing
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Solution Overview
Problem
Traditional exhaust gas recirculation (EGR) systems in diesel engines suffer from poor mixing of EGR gas with fresh air, leading to uneven distribution among engine cylinders and increased engine-out smoke emissions, while attempts to improve mixing often restrict fresh air intake.
Innovation Solution
A diffuser plate apparatus with a connecting portion and at least one plate, featuring a bore and apertures, is used to facilitate the mixing of EGR gas and fresh air by aligning apertures with the bore and arranging plates in a non-perpendicular plane to minimize surface area exposure, ensuring effective intermixing without restricting air flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If traditional mixer designs are used to improve EGR gas distribution, then EGR mixing is enhanced, but fresh air intake is restricted
Solution Approach 1:
The diffuser plate is positioned at an angle relative to the bore axis rather than perpendicular to it, changing the spatial dimension of the mixing structure. This angular arrangement allows the plate to intercept and redirect EGR flow in a way that promotes mixing without blocking the primary fresh air intake path, thus resolving the contradiction between mixing effectiveness and flow rate maintenance
2Object-affected harmful factors
If EGR flow rates are increased to reduce emissions, then emission control is improved, but engine-out smoke emissions increase due to poor mixing
Solution Approach 1:
The diffuser plate performs preliminary mixing of EGR gas with fresh air before the mixture enters the combustion chambers. By pre-mixing the gases at the diffuser plate location, the system can handle higher EGR flow rates without creating poor mixing conditions that would lead to smoke emissions, thus allowing emission control improvement without generating harmful smoke
3Quantity of substance
If traditional EGR mixing approaches are used, then some cylinders receive adequate EGR gas, but other cylinders become overloaded or receive insufficient EGR gas
Solution Approach 1:
The diffuser plate creates localized mixing zones where EGR gas is thoroughly mixed with fresh air at the plate location. This local mixing action ensures that the gas composition is homogenized before distribution to multiple cylinders, providing consistent EGR quality to each cylinder and eliminating the overload or insufficiency problems in specific cylinders
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 apparatus enhances the uniformity of the EGR and fresh air mixture, maintaining a high flow rate and reducing engine-out smoke emissions by ensuring even distribution of EGR gases across engine cylinders.
Implementation Method 1
The plate of the diffusing portion may be arranged to substantially minimize the surface area exposed to a second direction, which may be perpendicular to the first direction... configured to facilitate the mixing of EGR gas and fresh air
Data Source
AI summary
An apparatus configured for the mixing of two fluids traveling in substantially perpendicular directions. The apparatus includes a cylindrical member including a longitudinal conduit. The member also includes at least one diffusing plate. The diffusing plate includes a surface with a larger area and a surface with a smaller area. The larger area surface includes a plurality of apertures. The bore directs one of the fluids onto the larger area of the diffusing plate and through the apertures. The smaller surface of the diffusing plate is orientated in the direction of travel of the second fluid.