Turbine Bypass Flow Path for Catalyst Heating
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Solution Overview
Problem
The existing turbine designs, such as those described in Patent Literature 1, face issues with the valve in the bypass flow path obstructing the main flow, leading to inefficient direction of exhaust gas to the catalyst.
Innovation Solution
The proposed turbine design includes an impeller and a housing with a second flow path that directly connects the inlet to the second space downstream of the impeller, without connecting to the first space, allowing for efficient bypassing of exhaust gas and smooth direction to the catalyst.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a valve is provided in the bypass flow path to control exhaust gas flow, then the catalyst can be heated quickly during engine startup, but the valve obstructs the main flow and reduces exhaust gas direction efficiency
Solution Approach 1:
The valve is extracted from the bypass flow path and relocated to the housing structure upstream of the first space. This removes the obstruction problem while preserving the temperature control function for catalyst heating during engine startup.
Solution Approach 2:
The housing structure acts as an intermediary component that houses the valve mechanism. By placing the valve in the housing rather than directly in the bypass flow path, the system mediates between the need for flow control and the need for unobstructed exhaust gas direction.
2Ease of operation
If the bypass flow path connects to the first space (impeller space), then the valve can control bypass flow, but this creates obstruction and disrupts both main flow and bypass flow
Solution Approach 1:
The flow paths are segmented into distinct regions: the bypass flow path connects directly from the inlet to the second space, separate from the first space (impeller space). This segmentation prevents interference between the bypass flow control function and the main flow through the impeller.
Solution Approach 2:
The bypass flow path is routed through a different spatial dimension - connecting inlet directly to second space downstream, bypassing the first space entirely. This dimensional reconfiguration eliminates the obstruction problem while maintaining control capability.
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 configuration ensures that the exhaust gas is smoothly directed, preventing obstruction of the bypass flow and main flow, thereby enhancing the heating of the catalyst during engine startup.
Implementation Method 1
An impeller 2 and a housing 5 accommodating the impeller 2 are provided.
Implementation Method 2
a first flow path 51 that connects the inlet 5b to the first space S1
Implementation Method 3
a second flow path 52 that directly connects the inlet 5b to the second space S2 without connecting the inlet 5b to the first space S1
Implementation Method 4
The turbine 5 may include a valve V that opens and closes the second flow path 52 at a position upstream of the first space S1.
Data Source
AI summary
A turbine includes an impeller, and a housing that accommodates the impeller, the housing including an inlet that fluidly communicates with an exhaust port of an engine, a first space that accommodates the impeller, a second space that is located downstream of the first space in a flow of exhaust gas from the engine, a first flow path that connects the inlet to the first space, and a second flow path that directly connects the inlet to the second space without connecting the inlet to the first space.