Simultaneous Visualization of Natural Luminosity and Chemiluminescence of Dual Fuel Combustion in an Optically Accessible Engine

Qiang Cheng*, Zeeshan Ahmad, Ossi Kaario, Martti Larmi

*Corresponding author for this work

Research output: Contribution to journalConference articleScientificpeer-review

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Abstract

The engine fueled with methane/diesel is a promising and highly attractive operation mode due to its high performance-to-cost ratio and clean-burning qualities. However, the combustion process and chemical reactions in dual fuel combustion are highly complex, involving short transient pilot-fuel injection into the premixed gaseous fuel charge, autoignition, and combustion mode transition into premixed flame propagation. The motivation of the current investigation is to gain an insight into the combustion dynamics in dual fuel combustion engine based on chemical radicals and thermal radiation. The chemiluminescence (CL) and natural luminosity (NL) are expected to provide specific characteristics in combustion control and monitoring. To visualize the highly unsteady combustion process in terms of OH∗, CH2O∗ radicals and natural luminous emissions, the band pass filters with 308 nm, 330 nm combined with an image doubler are employed to visualize the OH∗ and CH2O∗ CL simultaneously. High speed natural luminosity imaging is adopted to illustrate the effects methane lambda and pilot ratio on the ignition delay, luminous intensity and engine performance. Spectroscopy analysis based on OH∗, CH2O∗ and NL was performed to study the chemical reactions in dual fuel mode.

Original languageEnglish
JournalSAE Technical Papers
Volume2020-April
Issue numberApril
DOIs
Publication statusPublished - 14 Apr 2020
MoE publication typeA4 Article in a conference publication
EventSAE World Congress Experience - Detroit, United States
Duration: 21 Apr 202023 Apr 2020

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