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Published in:
2018 | OriginalPaper | Chapter
Quantitative Optical Measurement Techniques for Mixture Formation and Combustion Process Analysis
Authors : Thomas Berg, Stefan Seefeldt, Olaf Thiele
Published in: Knocking in Gasoline Engines
Publisher: Springer International Publishing
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Abstract
Optical imaging and sensor techniques provide detailed analysis of mixture formation, ignition and combustion processes. The evaluation of image sequences and sensor data obtains quantified measured values to characterize engine conditions.
In-cylinder infrared absorption measurement techniques are applied to record Lambda values, residual gas content (water and CO2 concentration) and gas temperature with high time resolution. Especially the temporal analysis of the Lambda value evolution within engine cycles is a criterion for the quality of mixture formation and ignitability. This reveals quantified indices for the combustion stability.
Advanced processing of a series of highly time resolved images from an engine’s cycle generates quantified data about spray pattern formation, flame propagation and soot temperature. Images of the early flame evolution are analyzed using a dynamic thresholding algorithm and reveal the flame propagation.