Vortex Generator Sub-Aperture Flow Control
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Solution Overview
Problem
Existing vortex generators for internal combustion engines face issues with liquid fuel pooling near the intake flow control valve, leading to incomplete combustion and reduced engine performance, especially at low engine speeds, due to sub-optimal flow alignment and manufacturing complexities, which increase costs and weight.
Innovation Solution
A vortex generator design that includes a housing with recessed portions and a valve that defines both a main aperture and sub-apertures, allowing for efficient flow alignment and reduced manufacturing complexity through simultaneous molding of the housing and valve, ensuring robustness and cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the valve is positioned in an intermediate position to allow tumble flow during engine startup, then combustion efficiency is improved, but the sub-aperture flow alignment becomes misaligned with the flow direction, reducing sub-intake flow velocity and causing fuel pooling
Solution Approach 1:
The aperture is divided into a main aperture and multiple sub-apertures. The main aperture handles the primary intake flow while the sub-apertures provide supplemental flow paths that remain aligned with the flow direction even when the valve is in intermediate positions, ensuring consistent sub-intake flow velocity and preventing fuel pooling.
Solution Approach 2:
Different portions of the valve structure serve different functions: the main aperture is positioned to optimize tumble flow generation, while the sub-apertures are strategically positioned at the edges adjacent to the valve shaft to maintain flow alignment. This local differentiation ensures that each aperture type optimizes its specific function regardless of valve position.
2Device complexity
If the main aperture is used for all intake flow, then device complexity is reduced, but liquid fuel pooling occurs near the intake flow control valve causing incomplete combustion
Solution Approach 1:
The single aperture is segmented into a main aperture and multiple sub-apertures. The sub-apertures create additional flow paths that generate sub-intake flows to counteract return flows and prevent fuel pooling, while the main aperture continues to handle the primary intake flow. This segmentation solves the fuel pooling problem without significantly increasing overall device complexity.
Solution Approach 2:
The sub-apertures act as intermediary flow paths between the main aperture and the combustion chamber. They provide supplemental intake flows that mediate the harmful return flow effect, creating a more balanced flow pattern that prevents fuel accumulation near the valve.
3Manufacturing precision
If separate manufacturing processes are used for housing and valve, then manufacturing precision is improved, but manufacturing cost and time increase
Solution Approach 1:
The housing and valve are merged into a single integrated component manufactured through injection molding. This eliminates the need for separate manufacturing processes and assembly operations, reducing manufacturing complexity and cost while maintaining adequate fit tolerance through molded-in features.
Solution Approach 2:
The injection molding process serves multiple functions: it forms the housing structure, creates the aperture geometry, and integrates the valve assembly all in one operation. This multi-functionality of the manufacturing process eliminates the need for sequential operations and reduces overall manufacturing complexity.
4Reliability
If the valve thickness is increased to improve strength, then reliability is improved, but device weight and size increase
Solution Approach 1:
The valve is manufactured using glass fiber reinforced resin, a composite material that provides high strength-to-weight ratio. The glass fibers reinforce the resin matrix, enabling the valve to maintain adequate strength with reduced thickness and weight compared to solid metal construction.
Solution Approach 2:
The material properties are changed from traditional metal to composite material, fundamentally altering the strength-density relationship. This parameter change allows the valve to achieve the required strength with significantly reduced weight and thickness.
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 effectively prevents fuel pooling by ensuring strong sub-intake flows counter return air, improving combustion efficiency and reducing manufacturing costs and weight.
Implementation Method 1
a vortex generator capable of creating a vortex of fluid flowing therethrough
Data Source
AI summary
A vortex generator is disclosed for flow of a fluid. The vortex generator includes a housing that includes a passage through which the fluid flows. The vortex generator also includes a valve that is movably coupled to the housing between a fully closed position and a fully open position for changing flow of the fluid in the passage. The valve includes an open portion that defines a main aperture for generating a vortex in the flow of the fluid. Also, the valve has an intermediate position between the fully closed position and the fully open position. The housing further includes a recessed portion such that the recessed portion of the housing and the valve cooperate to define a sub-aperture through which the fluid flows when the valve is positioned in the intermediate position. A method of manufacturing the vortex generator is also disclosed.