Prechamber Ignition System Induction Port Flow Control
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Solution Overview
Problem
Conventional pre-chamber spark plugs in lean burn engines face issues such as inadequate fuel concentration at the spark gap, disorganized flow fields leading to flame kernel quenching, insufficient mixing with residual gases, slow burn rates, and reduced momentum of flame jets.
Innovation Solution
A pre-combustion chamber design with induction ports that direct fuel-oxidizer mixtures to ricochet from internal surfaces, creating organized flow fields that move flame growth away from quenching surfaces, increase fuel concentration, and enhance mixing with residual gases, resulting in improved burn rates and flame jet momentum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional pre-chamber spark plugs are used, then the structure is simple, but the flow field forces are disorganized and flame kernel quenching occurs
Solution Approach 1:
The pre-combustion chamber is segmented into multiple functional regions with specific geometric features (induction ports, quenching surfaces, recirculation zones) that create organized flow field forces. The chamber is divided into regions that promote fuel concentration at the spark gap and generate controlled flow patterns to prevent flame quenching.
Solution Approach 2:
Different regions of the pre-combustion chamber are designed with local quality variations - the induction ports have specific angles and positions to direct flow, the quenching surfaces are strategically located to repel flame kernels, and the overall chamber geometry creates localized high-energy zones that enhance combustion reliability.
2Quantity of substance
If conventional pre-chamber spark plugs are used, then the device is simple, but fuel concentration at the spark gap is inadequate
Solution Approach 1:
The pre-combustion chamber geometry is designed to perform preliminary fuel concentration and mixing before the spark ignition event. The induction ports and chamber shape pre-organize the fuel-oxidizer mixture distribution, ensuring high fuel concentration at the spark gap region is achieved automatically during the compression stroke without requiring additional active control mechanisms.
3Productivity
If conventional pre-chamber spark plugs are used, then the structure is simple, but mixing with residual gases is insufficient
Solution Approach 1:
The pre-combustion chamber design creates continuous recirculation of the fuel-oxidizer mixture through the induction ports and across the quenching surfaces throughout the compression stroke. This continuous flow ensures persistent mixing with residual gases from the previous cycle, maintaining high burn rates without requiring complex multi-stage mixing systems.
4Force
If conventional pre-chamber spark plugs are used, then the device is simple, but flame jet momentum is reduced
Solution Approach 1:
The pre-combustion chamber employs curved surfaces and rounded geometric features that guide the flame kernel and flow fields in smooth, continuous paths. The curved quenching surfaces and induction port geometries create streamlined flow patterns that preserve flame jet momentum and enhance the coherence of the flame front as it transitions to the main combustion chamber.
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 increased fuel-oxidizer mixture ratio, reduces flame kernel interaction with quenching surfaces, enhances burn rates, and increases the momentum of flame jets deployed to the main combustion chamber.
Implementation Method 1
directs the fuel-oxidizer mixture of in-filling streams to ricochet from one or more locations on the internal surface of the pre-combustion chamber to achieve a flow field and flow field forces inside of the pre-combustion chamber which direct flame growth away from flame quenching surfaces
Implementation Method 2
achieve a flow field and flow field forces inside of the pre-combustion chamber which direct flame growth away from flame quenching surfaces
Implementation Method 3
mix in-filling streams with residual gases to sufficiently lower the temperature inside of the pre-chamber
Data Source
AI summary
Generally, embodiments of a pre-chamber unit having a pre-combustion chamber including one or more induction ports in a configuration which achieves flow fields and flow field forces inside the pre-combustion chamber which act to direct flame growth away quenching surface of the pre-combustion chamber.