Ignition Plug Tip Funnel Inlet Flow Channel
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Solution Overview
Problem
Internal combustion engines with pre-combustion chambers face challenges in achieving smooth and efficient transition of burning fuel from the pre-combustion chamber to the main combustion chamber, leading to incomplete combustion and reduced efficiency.
Innovation Solution
The ignition plug tip features a nozzle portion with a funnel-shaped inlet and outlet, where the funnel-shaped inlet portion at the inner surface has a greater diameter than the main portion, and the outlet is also funnel-shaped, extending into the main combustion chamber, facilitating a smooth acceleration and transition of the burning fuel, thereby increasing the velocity and ensuring complete combustion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional flow channel design is used to connect the pre-combustion chamber to the main combustion chamber, then the structure is simple, but the transition of burning fuel is not smooth and efficient, leading to incomplete combustion
Solution Approach 1:
The flow channel incorporates curved surfaces and rounded transitions instead of sharp angles, creating a smooth passage for the burning fuel. The curved geometry reduces flow separation and turbulence, enabling efficient transition of the flame front from the pre-combustion chamber to the main combustion chamber while maintaining complete combustion.
Solution Approach 2:
The flow channel design features varying cross-sectional areas along its length, with specific regions optimized for different functions. The inlet portion has a larger cross-section to receive the burning fuel, while the outlet portion is configured to direct the flame front effectively into the main combustion chamber, creating local optimizations that improve overall combustion efficiency.
2Speed
If the flow channel has a uniform cross-section, then the manufacturing is simple, but the velocity of burning fuel is not sufficiently increased, reducing combustion completeness
Solution Approach 1:
The flow channel cross-sectional area is varied along its length to optimize the velocity of the burning fuel. The inlet portion has a larger cross-section that gradually transitions to a smaller outlet cross-section, creating a converging geometry that accelerates the burning fuel and flame front, thereby improving combustion completeness despite increased manufacturing complexity.
3Loss of energy
If the flow channel is short, then the device is compact, but the kinetic energy loss of burning fuel is increased, reducing combustion efficiency
Solution Approach 1:
The curved geometry of the flow channel reduces flow separation and turbulence losses, allowing the channel to be shorter while minimizing kinetic energy loss. The smooth transitions created by curved surfaces maintain flow coherence and reduce dissipative effects, enabling compact design without sacrificing energy efficiency.
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 stabilizes the transition of burning fuel, reduces kinetic energy loss, and ensures that the burning fuel in the form of torches reaches the entire main combustion chamber, enhancing the efficiency and performance of the internal combustion engine.
Implementation Method 1
The funnel-shaped inlet portion (114) at the inner surface (75) has a length (a) of about 30 % to 70 % the length (c) of the at least one flow channel (110). The diameter of the funnel-shaped inlet portion at the inner surface is greater than the diameter of the main portion.
Implementation Method 2
The at least one flow channel (110) extends tangentially with respect to a center axis (90) of the nozzle portion (74) such that a swirl of the combustion mixture within the main combustion chamber (26) is increased.
Implementation Method 3
The outlet (116) is also funnel-shaped, extending into the main combustion chamber, facilitating a smooth acceleration and transition of the burning fuel, thereby increasing the velocity and ensuring complete combustion.
Data Source
Figure 1
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AI summary
The present disclosure generally relates to an ignition plug tip (70) of an ignition plug configured to be used in an internal combustion engine including at least one main combustion chamber. The disclosed ignition plug tip (70) may comprise a nozzle portion (74) forming at least a portion of a pre-combustion chamber (66) and having an inner surface (75). The disclosed ignition plug tip (70) may further comprise at least one flow channel (110) configured to fluidly connect the pre-combustion chamber to the main combustion chamber, wherein the at least one flow channel (110) includes a main portion (118) having constant cross-section and a funnel-shaped inlet portion (114) at the inner surface (75). The inlet portion (114) may constitute about 30% to 70% of the length of the flow channel (110).