Pre-chamber Spark Plug Asymmetric Flow for Combustion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional pre-chamber spark plugs face challenges in achieving rapid flame convection and efficient combustion due to symmetrical spark location arrangements, leading to increased wall heat losses and preignition risks, while also limiting flame penetration depth and engine operation efficiency.
Innovation Solution
The pre-chamber spark plug is designed with a tumble-shaped flow configuration, where the spark location is positioned in a downward-directed region within the pre-chamber, and the openings are arranged asymmetrically to create a cylindrical flow, enhancing flame convection and reducing wall heat losses, thereby improving ignition stability and combustion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the spark location is arranged symmetrically in the pre-chamber, then the structure is simple and easy to manufacture, but the flame convection is slow and wall heat losses increase
Solution Approach 1:
The patent applies asymmetry by positioning the spark location in the downward-directed region of the pre-chamber rather than centrally or symmetrically. This asymmetric arrangement creates an uneven flow pattern that enhances flame convection toward the openings, reducing wall heat losses while maintaining manufacturing simplicity through a straightforward structural modification
2Ease of manufacture
If the openings are arranged symmetrically around the pre-chamber axis, then the structure is simple, but the flame penetration depth is limited and combustion efficiency decreases
Solution Approach 1:
The patent employs asymmetry in opening arrangement by positioning openings predominantly in the upward-directed flow region rather than symmetrically distributed. This creates an asymmetric flow pattern that enhances flame convection and penetration depth, improving combustion efficiency while maintaining ease of manufacture through a straightforward opening configuration
3Device complexity
If the spark location is positioned in the upward-directed region, then the structure is simple, but rapid flame exit is prevented and preignition risk increases
Solution Approach 1:
The patent applies inversion by positioning the spark location in the downward-directed region rather than the conventional upward-directed region. This inverted arrangement utilizes the downward flow to rapidly convect the initial flame core toward the openings, enabling quick flame exit and reducing preignition risk without increasing device complexity
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 configuration results in rapid flame exit, increased low-load capacity, reduced preignition risk, and deeper flare penetration, leading to more stable idling and improved combustion performance.
Implementation Method 1
the electrode device has, for example, at least or precisely two electrodes, wherein, for example, one of the electrodes is referred to also as the first electrode and the other electrode is referred to also as the second electrode. The electrodes, in particular their respective ends or tips arranged in the pre-chamber, are for example distanced from one another, so that, for example, the electrodes, in particular their free ends or tips, form or delimit a spark region, in which the ignition spark can be generated
Implementation Method 2
A fuel-air mixture, also referred to simply as a mixture, can be introduced from the combustion chamber into the pre-chamber via the various openings
Implementation Method 3
the pre-chamber spark plug is configured to cause a tumble-shaped flow of the fuel-air mixture flowing into the pre-chamber via the openings. This shall be understood to mean that the pre-chamber spark plug imparts a tumble-shaped and thus cylindrical flow, also referred to as tumble flow, onto the mixture flowing through the openings
Implementation Method 4
a rapid convection of an initial flame core in the direction of the openings, also called nozzles or formed as nozzles, can be realized by the arrangement of the spark location in the second region
Implementation Method 5
the fuel-air mixture, also referred to simply as the mixture, which has flowed into the pre-chamber via the opening can be sparked or ignited and subsequently burned in the pre-chamber so that, for example, flames or burning flares resulting from the ignition and combustion of the mixture can flow out of the pre-chamber via the openings
Data Source
AI summary
A pre-chamber spark plug for a combustion chamber of a combustion engine includes a pre-chamber which has a plurality of openings and an electrode device which is disposed in the pre-chamber. An ignition spark for igniting a fuel-air mixture introduced into the pre-chamber is generatable at a spark location in the pre-chamber by the electrode device. The pre-chamber spark plug is configured to bring about a tumble-shaped flow of fuel-air mixture flowing into the pre-chamber via the plurality of openings. The tumble-shaped flow has, in a first region of the pre-chamber, a first flow part pointing upward away from the plurality of openings, and, in a second region of the pre-chamber, a second flow part adjoining the first flow part and pointing downward in a direction of the plurality of openings. The spark location is disposed at least in part in the second region.