Flat Injection Hole Geometry for Fuel Wall Evaporation
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Solution Overview
Problem
Existing fuel injection valves do not adequately address the adhesion and evaporation of fuel on the inner wall, leading to particulate matter generation and inefficient atomization, particularly at low temperatures.
Innovation Solution
The fuel injection valve features a nozzle with flat injection holes having a specific shape and curvature ratio, promoting uniform fuel film formation and homogeneous spraying, enhancing fuel evaporation and reducing residual fuel on the wall.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the injection hole shape is made flat to reduce the surface area of the inner wall, then the accumulation of deposits is limited, but the atomization efficiency and fuel evaporation are insufficient particularly at low temperatures
Solution Approach 1:
The invention applies local quality by creating different surface characteristics in different regions of the injection hole. The inner wall is designed with a specific curvature radius at the outlet opening to optimize fuel film formation and evaporation in the critical exit region, while maintaining a flat cross-section overall. This localized optimization at the outlet opening improves atomization and evaporation without significantly increasing the total inner wall surface area.
Solution Approach 2:
The invention utilizes curvature by specifying a particular curvature radius for the outlet opening of the injection hole. This curved outlet design improves fuel atomization and evaporation by creating more uniform flow patterns and reducing residual fuel on the walls, while still maintaining the flat cross-section characteristic that limits deposits accumulation.
2Stability of the object's composition
If the injection hole has a flat cross-section to limit deposits, then the fuel film formation is improved, but the evaporation of adhered fuel is insufficient
Solution Approach 1:
The invention applies local quality by optimizing only the outlet opening region with a specific curvature radius while maintaining the flat cross-section of the injection hole. This localized optimization at the outlet improves fuel evaporation by creating better flow patterns and reducing residual fuel, without compromising the uniform fuel film formation achieved through the flat cross-section design.
Solution Approach 2:
The invention changes the geometric parameters of the injection hole by specifying a particular curvature radius for the outlet opening. This parameter optimization improves fuel evaporation and atomization by creating more uniform flow and reducing residual fuel on the walls, while maintaining the flat cross-section that ensures uniform fuel film formation.
3Object-generated harmful factors
If the inner wall surface area is reduced to limit deposits, then the fuel adhesion is minimized, but the evaporation rate of adhered fuel is reduced
Solution Approach 1:
The invention uses curvature by designing the outlet opening with a specific curvature radius that optimizes fuel flow patterns. This curved outlet design improves evaporation of adhered fuel by creating more uniform flow and reducing residual fuel accumulation, while the overall flat cross-section maintains limited inner wall surface area to minimize deposits.
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 achieves highly dispersed and homogeneous fuel spraying, reducing particulate matter generation by increasing the evaporation of adhered fuel and improving atomization efficiency.
Implementation Method 1
The at least one specific flat injection hole has an injection hole axis that connects between a center of the inlet opening and a center of the outlet opening while the long axis of the outlet opening of the at least one specific flat injection hole is perpendicular to a plane which includes the injection hole axis and is parallel with a valve axis
Implementation Method 2
enhancing fuel evaporation and reducing residual fuel on the wall
Data Source
AI summary
A plurality of injection holes include at least one flat injection hole while an outlet opening of the at least one flat injection hole has a long axis and a short axis, and the at least one flat injection hole includes at least one specific flat injection hole. The specific flat injection hole has an injection hole axis that connects between a center of an inlet opening and a center of the outlet opening, and the long axis of the outlet opening is perpendicular to a plane which includes the injection hole axis and is parallel with the valve axis. An inner wall of the outlet opening has two planar portions which are opposed to each other while the long axis is interposed between the planar portions.