Exhaust Manifold Diffuser Geometry for Lower Pressure Loss
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Solution Overview
Problem
Manifolds in internal combustion engines, particularly those used in the exhaust tract, suffer from significant pressure losses that increase the exhaust effort required, leading to decreased engine efficiency, especially downstream from turbines like turbochargers.
Innovation Solution
A manifold design featuring a centrally arranged diffuser section integrated with the wall, which minimizes pressure loss by optimizing flow guidance and preventing flow separation, and is constructed as a single component with the wall to enhance containment properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional manifold is used in the exhaust tract, then the manifold can be manufactured simply, but pressure loss increases and engine efficiency deteriorates
Solution Approach 1:
The manifold is divided into functionally distinct sections: a diffuser section for pressure reduction and a flow guidance section for directing flow to the turbine inlet. This segmentation allows each section to be optimized for its specific function, reducing overall pressure loss while maintaining manufacturing feasibility through modular design
Solution Approach 2:
The diffuser section employs curved surfaces and gradual transitions rather than sharp angles to guide exhaust flow smoothly from the collector to the turbine inlet. This curvature minimizes flow separation and turbulence, significantly reducing pressure loss and energy dissipation
2Productivity
If pressure loss is reduced through optimized flow guidance, then engine efficiency improves, but manufacturing complexity increases
Solution Approach 1:
The diffuser section and flow guidance section are merged into a single integrated manifold component rather than separate parts. This consolidation simplifies manufacturing by eliminating assembly steps while maintaining the optimized flow paths that enhance engine efficiency
Solution Approach 2:
The manifold design utilizes computational fluid dynamics to optimize geometric parameters such as diffuser angle, curvature radius, and flow passage cross-section. These parameter optimizations reduce pressure loss and improve engine efficiency while remaining manufacturable through precision casting or molding processes
3Loss of energy
If the diffuser section is arranged centrally on the inlet side, then flow separation is minimized and pressure loss is reduced, but the manifold design becomes more complex
Solution Approach 1:
The diffuser section is positioned asymmetrically within the manifold, specifically on the inlet side rather than centrally or on the outlet side. This asymmetric arrangement optimizes the flow path by reducing flow separation at the turbine inlet while maintaining a manageable geometric complexity through controlled diffuser dimensions and angles
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 design significantly reduces pressure loss, enhances flow efficiency, and improves containment, thereby increasing the efficiency of internal combustion engines and reducing the risk of turbine wheel displacement.
Implementation Method 1
By way of the diffuser section, which is arranged centrally on the inlet side, the pressure loss across the manifold can be significantly reduced. In particular, recirculation is minimized at a turbine hub adjacent to the diffuser section when the manifold is used with a turbine.
Implementation Method 2
the pressure loss across the manifold can be significantly reduced
Implementation Method 3
The fact that the diffuser section is designed as a single component with the wall allows for a uniquely optimized flow guidance, whereby in particular, flow separation can be at least largely avoided, optionally prevented.
Implementation Method 4
The diffuser section which is arranged centrally on the inlet side also has the advantage of making it more difficult for a turbine wheel to be pushed out axially in the event of a rupture, so that the proposed manifold has improved containment properties in conjunction with a turbine with which it is used.
Data Source
AI summary
A manifold for deflecting the flow of a medium flowing through the manifold from an inlet side of the manifold to an outlet side of the manifold includes: the inlet side; and a wall at least partially defining and thereby restricting a flow volume of the manifold, the wall including an inside wall section that is curved and an outside wall section that is curved, the inside wall section including a first radius of curvature, the outside wall section including a second radius of curvature that is larger than the first radius of curvature, the inside wall section including a formed-in section which is formed into the flow volume and which is drawn in a direction of flow of the medium and thus towards the outlet side.