Abstract
The early flame development stage of syngas and CNG are analysed and compared from the flame images taken over 20° CA from the start of ignition. An imitated syngas with a composition of 19.2% H2, 29.6% CO, 5.3% CH4 and balance with nitrogen and carbon dioxide, which resembles the typical product of wood biomass gasification, was used in the study. A CCD camera triggered externally through the signals from the camshaft and crank angle sensors was used in capturing of the images. The engine was accessed through an endoscope access and a self-illumination inside the chamber. The results of the image analysis are further compared with the mass fraction burn curve of both syngas and CNG analysed from the pressure data. The analysis result of the flame image of syngas validates the double rapid burning stage of the mass fraction burn of syngas analysed from in-cylinder pressure data.
Highlights
The history of in-cylinder combustion and flow visualization is associated to Rossweiler and Withrow in 1938 when for the first time they modified a spark ignition engine to have an optical window [1]
ATDC to see the full picture of the variation of mass fraction burn (MFB), there is limitation with the endoscope access of the engine
It gets obstructed in the region from 10o CA BTDC to 10o CA ATDC due to the piston covering the endoscopic access
Summary
The history of in-cylinder combustion and flow visualization is associated to Rossweiler and Withrow in 1938 when for the first time they modified a spark ignition engine to have an optical window [1]. The combustion behavior of fuel in an internal combustion engine can be studied with the help of flame imaging. This technique is mainly helpful in the study of flame development stage of the combustion. The most common ones are planar laser-induced fluorescence (PLIF) imaging with the help of laser diagnostic technique and direct visualization techniques like single shot camera or continuous video recording and imaging the chemiluminescence signals of combustion gas radicals. The general objective of this study is to explore the employment of syngas in a direct injection spark ignition internal combustion gaseous engine as a potential replacement for fossil derived fuels. A direct visualization technique is preferred that use a self-luminosity assisted by an image intensifier to compare the flame characteristics of syngas and CNG. Further the flame visualization analysis result is compared with the mass fraction burn results if any relationship can be drawn
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