Abstract
Spark plug with integrated chamber increases the quality of ignition of homogenous mixture in the engine cylinder. Very small amount of burning mixture bursts (outflows) from chamber (so-called flame jet ignition) which heads into faster initial phase of burning. From view of cycle to cycle variations the procedure of consequent burning is more stable. Spark plug’s case with integrated chamber is exposed by higher thermal stress than classis spark plug. This fact has to be respected during design of spark plug with integrated chamber. This article shows the how configuration of the lower part of spark plug with integrated chamber can change the type of spark and how flame-jet ignition will affect parameters of burning mixture during operating cycle.
Highlights
Indirect ignition of a fuel mixture in a spark ignition engine is referred to in the literature as an indirect ignition and in English, for example, as a flame-jet [1], jet-ignition [2 - 4] or chamber / prechamber ignition [5 6]
The difference between individual solutions is in the way of fuel supply, respectively. fuel mixture to the spark plug
The KVM internal documents state that the experimental research program to verify the effect of the protected space around the spark plug electrodes in the chamber, where the conditions for the development of the ignition outbreak and combustion of the fuel mixture in the chamber and the exhaust of the combustion gases and of the combustible air out of the spark plug chamber into the combustion chambers in the engine cylinder accelerate the combustion of the fuel mixture in the engine cylinder, it was in the first stage carried out on only one cylinder of gasoline and gas engines
Summary
Indirect ignition of a fuel mixture in a spark ignition engine is referred to in the literature as an indirect ignition and in English, for example, as a flame-jet [1], jet-ignition [2 - 4] or chamber / prechamber ignition [5 6]. An indicator of the quality and stability of the combustion process in the cylinder of the internal combustion engine is the variability of engine operating cycles. Variability (referred to differently - for example VAR, CoV, ...) of cycles is usually expressed as the ratio of the standard deviation to the average value of the given parameter. Xxy parameter value determined by thermodynamic analysis and statistical processing of a larger set of indicator diagrams in the engine operating mode under investigation (in the case of a highpressure engine indication, a data set of 100 or 150 consecutive engine operating cycles is typically recorded). For a modern gasoline engine in higher engine load modes, the variability of the mean pressure indicated is VARpi ≈ 1-2%. Main parameters of the test bench are: pressure 8bar, voltage 25kV
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