Turbocharger Turbine Vanes for Catalyst Flow Uniformity
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Solution Overview
Problem
Internal combustion engines face challenges in maintaining even flow characteristics through catalyst assemblies, which affects the efficiency of exhaust gas treatment and emission standards compliance, especially when integrating turbochargers due to size and packaging constraints.
Innovation Solution
A turbocharger design with a catalyst assembly axially connected to the exhaust gas outlet of the turbine housing, featuring vanes at specific angles and a toroidal-shaped low pressure exhaust gas chamber to ensure even flow and maximize catalyst contact with exhaust gases, thereby improving fuel efficiency and power output while meeting emission standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a turbocharger is integrated into the engine system to improve power output and fuel efficiency, then engine performance is improved, but packaging becomes challenging due to size and connection requirements
Solution Approach 1:
The catalyst assembly is merged with the turbine housing to form an integrated exhaust treatment system. The catalyst housing is positioned to receive exhaust gases directly from the turbine wheel, eliminating the need for separate exhaust piping and reducing packaging complexity while maintaining power output improvements from turbocharging.
Solution Approach 2:
The turbine housing serves multiple functions: it houses the turbine wheel for power generation, directs exhaust gas flow, and integrates the catalyst assembly for emissions treatment. This multi-functionality reduces the number of separate components needed, simplifying packaging while achieving both power and emissions goals.
2Temperature
If the catalyst assembly is placed close to the turbocharger to maintain high temperatures, then catalyst performance is improved, but maintaining even flow characteristics through the catalyst assembly becomes challenging
Solution Approach 1:
The turbine housing includes specific flow control features such as a diffuser section and a straight section leading to the catalyst inlet. These localized structural modifications create optimal flow conditions at the catalyst entrance, ensuring even distribution of hot exhaust gases across the catalyst surface while maintaining high temperatures for catalyst performance.
Solution Approach 2:
The turbine housing incorporates a diffuser section with curved surfaces that gradually expand to reduce turbulence and redistribute exhaust gas flow. This curvature design smooths out flow irregularities and promotes uniform gas distribution into the catalyst assembly, maintaining both temperature and flow evenness.
3Productivity
If the catalyst is placed closer to the exhaust source to improve performance, then catalyst efficiency is improved, but packaging constraints are intensified
Solution Approach 1:
The catalyst assembly is nested within or adjacent to the turbine housing structure. The catalyst housing is positioned to utilize the space created by the turbine assembly, with the catalyst inlet receiving exhaust gases directly from the turbine wheel. This nesting arrangement places the catalyst close to the exhaust source for high efficiency while utilizing existing structural space, minimizing additional packaging volume.
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 ensures even flow of exhaust gases through the catalyst assembly, enhancing the performance and longevity of the catalyst elements, thus improving fuel efficiency, power output, and addressing stringent emission standards.
Implementation Method 1
The low pressure exhaust gas chamber includes at least a first and second vanes disposed proximate an outer circumferential wall of the low pressure exhaust gas chamber... the first and second vanes of the low pressure exhaust gas chamber are disposed in the low pressure exhaust gas chamber at an angle α relative to a line perpendicular to the outer circumferential wall
Implementation Method 2
Manufacturers of vehicles that use ICEs take means to clean exhaust gases prior to releasing the exhaust gases into the atmosphere. Cleaning exhaust gases may be accomplished with a catalyst assembly which uses reacting elements deposited onto a ceramic carrier placed in the flowpath of the exhaust gases.
Data Source
AI summary
A turbocharger for an internal combustion engine having a close coupled catalyst assembly includes a turbine housing having a toroidal-shaped low pressure exhaust gas chamber having a plurality of vanes disposed proximate the outer circumferential wall of the low pressure exhaust gas chamber. The vanes are arranged to disrupt the rotational flow of the exhaust gases as they exit the turbine housing to provide a more even flow though the catalyst element of the close coupled catalyst assembly.