Abstract
Combustion of the lean mixtures in the spark ignition engines provides higher thermal efficiency compared to the combustion of the stoichiometric mixture but is more restrictive to the ignition systems. Due to the limitations of conventional ignition systems, advanced concepts are being used, e. g. spark-jet ignition. Presented research has been carried to determine: 1. The impact of fuel injection pressure on the velocity of mixture formation, 2. Fuel distribution inside ignition chamber in defined phases of chamber filling, 3. Influence of chamber back-pressure on gas jet development. Investigations have been carried using the ignition chamber providing optical access. The visualization has been done with Schlieren-method with “Z”-setup basing on two ϕ = 150 mm parabolic mirrors. Images have been recorded with LaVision HSS5 camera with CMOS transducer. The paper contains a comparison of gas penetration parameters for a different injection pressures and chamber backpressures. The injection into the quasi-static air has been compared to the injection in dynamic conditions. It is stated, that both injection pressure and chamber back-pressure influence gas jet-development in the ignition chamber. The regions of the chamber with increased swirling and therefore providing more efficient micromixing have been identified.
Highlights
Big worldwide demand for the fuel energy in combination with limitations in available crude oil resources is a significant fact by the intensification of research into alternative fuels
Important advantages present the group in the gaseous state of matter, for example, relative high calorific value and octane number
It determines the rise of their exploitation as well as motivation to conduct the study on the ignition system for CNG combustion systems [1,2,3]
Summary
Big worldwide demand for the fuel energy in combination with limitations in available crude oil resources is a significant fact by the intensification of research into alternative fuels. Shorter time to reach full registration length has been noted for increased PR It is stated, that injection pressure impacts velocity of jet evolution, but the dependency doesn’t show linear character. That injection pressure impacts velocity of jet evolution, but the dependency doesn’t show linear character As it was mentioned, the implementation of spark-jet ignition leads to the mixture inflammation on the way of. Combustion indicators and flame development in the combustion chamber have been analyzed for the operation of an optically accessible engine equipped with spark ignition, which has been replaced and compared with the turbulent jet ignition. The faster burn rate of combustion initiated by hot jets has been observed
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