Pre-chamber Backflow Channels for Homogeneous Air-Fuel Mixing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional pre-chambers in internal combustion engines experience inhomogeneous air-fuel ratio (AFR) distribution at ignition time, leading to deteriorated combustion velocity and emission formation due to uneven fuel enrichment across regions.
Innovation Solution
Incorporation of backflow or recirculation channels in the pre-chamber body to create a pressure-driven backflow from the pre-chamber into the flow transfer passage, homogenizing the AFR distribution by enriching the mixture within the pre-chamber and flow transfer passage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional pre-chambers are used without backflow channels, then the structure is simpler, but the air-fuel ratio distribution becomes inhomogeneous leading to deteriorated combustion velocity and emission formation
Solution Approach 1:
The pre-chamber structure is segmented by adding separate backflow channels distinct from the main flow transfer passage. This segmentation allows independent control of fuel injection and mixture recirculation, enabling homogeneous AFR distribution through dedicated backflow pathways that return enriched mixture to the pre-chamber.
Solution Approach 2:
The backflow channels act as intermediary pathways that mediate between the flow transfer passage and the pre-chamber. These channels facilitate the recirculation of enriched mixture, serving as a mediator that homogenizes the air-fuel ratio by mixing freshly injected fuel with returned combustible gases before re-injection into the main combustion chamber.
2Productivity
If backflow channels are added to the pre-chamber body, then the AFR distribution is homogenized and combustion efficiency is enhanced, but the device complexity increases
Solution Approach 1:
The backflow channels enable continuous recirculation of enriched mixture from the flow transfer passage back to the pre-chamber. This continuous action ensures that fuel-injected regions are constantly replenished with combustible gases, maintaining homogeneous AFR distribution and sustained high combustion efficiency throughout the combustion cycle.
Solution Approach 2:
The backflow channels create a feedback mechanism where the enriched mixture produced in the flow transfer passage is returned to the pre-chamber for further enrichment and ignition. This feedback loop ensures that regions with excess fuel receive additional combustible gases, automatically balancing the AFR distribution and optimizing combustion performance.
3Quantity of substance
If fuel is injected directly into the pre-chamber without backflow, then the fuel enrichment is concentrated, but the AFR distribution becomes inhomogeneous causing deteriorated emission formation
Solution Approach 1:
The backflow channels enforce homogeneity by distributing the enriched mixture uniformly throughout the pre-chamber and flow transfer passage. By returning combustible gases to fuel-injected regions, the system eliminates local富 fuel zones that would otherwise create inhomogeneous combustion and harmful emissions, achieving uniform AFR distribution while maintaining high fuel concentration.
Solution Approach 2:
The system utilizes pneumatic principles where pressure-driven flow through the backflow channels transports the enriched mixture from the flow transfer passage back to the pre-chamber. This pneumatic recirculation mechanism ensures thorough mixing and uniform distribution of fuel and air, preventing localized rich zones that lead to poor emission formation.
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 backflow channels improve mixing and homogenize the AFR distribution, enhancing combustion efficiency and reducing emission formation by ensuring a more uniform fuel concentration across the pre-chamber and flow transfer passage.
Implementation Method 1
Incorporation of backflow or recirculation channels in the pre-chamber body to create a pressure-driven backflow from the pre-chamber into the flow transfer passage
Implementation Method 2
supplying a portion of the enriched mixture from the pre-chamber into the flow transfer passage via at least one backflow channel, and thereby, enriching the mixture in the flow transfer passage by mixing the mixture from the main combustion chamber and the enriched mixture from the pre-chamber
Data Source
AI summary
A pre-chamber body for an internal combustion engine is disclosed. The pre-chamber body may have a pre-chamber. The pre-chamber body may also have a flow transfer passage, which may fluidly connect the pre-chamber and an exterior of the pre-chamber body. In addition, the pre-chamber body may have at least one backflow channel, which may fluidly connect the pre-chamber and the flow transfer passage.