Turbocharger Exhaust Pipe Diffuser Integration
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Solution Overview
Problem
In turbocharger systems, the integration of a diffuser into the turbine housing limits the diffuser length, leading to inefficient exhaust gas routing and increased installation space requirements, which negatively impacts turbocharger efficiency due to the need for a smaller bend radius in the exhaust manifold.
Innovation Solution
The exhaust gas routing device features an exhaust pipe with an integrated diffuser area that can extend into the turbine housing, allowing for a longer diffuser length without increasing the turbine housing size, and includes a wastegate duct with strategically placed passages to minimize turbulence, enabling a larger bend radius and improved flow optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the diffuser is integrated into the turbine housing, then the turbine housing can be designed to accommodate the diffuser, but the diffuser length is limited and the installation space increases
Solution Approach 1:
The exhaust system is divided into separate functional components: the turbine housing and the exhaust manifold are designed as distinct elements. The exhaust manifold is positioned downstream of the turbine housing and contains the diffuser, allowing the diffuser length to be extended without increasing the turbine housing volume. This segmentation enables independent optimization of each component's dimensions and functions.
2Productivity
If the diffuser length is increased, then the exhaust gas flow efficiency improves, but the installation space requirements increase
Solution Approach 1:
The exhaust manifold is positioned in a different spatial dimension downstream of the turbine housing, extending in the flow direction rather than within the turbine housing volume. This dimensional repositioning allows the diffuser to achieve greater length and improved flow efficiency without increasing the compactness requirements within the turbine housing boundaries, thereby optimizing space utilization in the overall exhaust system layout.
3Volume of stationary object
If the turbine housing size is reduced, then the installation space decreases, but the diffuser length must be shortened reducing efficiency
Solution Approach 1:
The diffuser function is extracted from the turbine housing and relocated to the exhaust manifold downstream of the turbine housing. This extraction allows the turbine housing to be designed with reduced volume for compact installation, while the diffuser maintains its essential flow optimization function in the exhaust manifold, preserving turbocharger efficiency without the space penalty.
4Volume of moving object
If the exhaust manifold bend radius is reduced, then the installation space decreases, but the outflow efficiency from the turbine decreases
Solution Approach 1:
The exhaust manifold is designed with optimized curved transitions and smooth bends that maintain large radii of curvature throughout the exhaust gas flow path. These gentle curved transitions minimize flow separation and turbulence, preserving high outflow efficiency from the turbine while accommodating compact installation requirements through clever spatial arrangement of the curved sections.
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
This design enhances turbocharger efficiency by optimizing the turbine housing and exhaust manifold arrangement, reducing installation space constraints while maintaining efficient gas flow and improving the outflow from the turbine, thus increasing overall system performance.
Implementation Method 1
The diffuser area is enlarged by increasing the cross-section of the exhaust pipe, i. H. of the flow cross-section, in the flow direction of the flowing medium
Implementation Method 2
hot exhaust gases from the combustion chambers of the internal combustion engine flow through the turbine wheel of the exhaust gas turbine and thereby drive it
Data Source
Figure 2~3
Figure 3A~3B
AI summary
The invention relates to a turbocharger assembly (10) for an internal combustion engine, in particular for a commercial vehicle. The turbocharger assembly (10) comprises a turbocharger (11) with a turbine housing (20). The turbocharger assembly (10) also comprises an exhaust pipe (16). The exhaust pipe (16) is arranged downstream of the turbine housing (20). The exhaust pipe (16) has a diffuser section (22) and an exhaust manifold section (24).