Analysis of Transition from HCCI to CI via PPC with Low Octane Gasoline Fuels Using Optical Diagnostics and Soot Particle Analysis

Abstract
In-cylinder visualization, combustion stratification, and engine-out particulate matter (PM) emissions were investigated in an optical engine fueled with Haltermann straight-run naphtha fuel and corresponding surrogate fuel. The combustion mode was transited from homogeneous charge compression ignition (HCCI) to conventional compression ignition (CI) via partially premixed combustion (PPC). Single injection strategy with the change of start of injection (SOI) from early to late injections was employed. The high-speed color camera was used to capture the in-cylinder combustion images. The combustion stratification was analyzed based on the natural luminosity of the combustion images. The regulated emission of unburned hydrocarbon (UHC), carbon monoxide (CO) and nitrogen oxides (NO) were measured to evaluate the combustion efficiency together with the in-cylinder rate of heat release. Soot mass concentration was measured and linked with the combustion stratification and the integrated red channel intensity of the high-speed images for the soot emissions. The nucleation nanoscale particle number and the particle size distribution were sampled to understand the effect of combustion mode switch.

Citation
An Y, Vallinayagam R, Vedharaj S, Masurier J-B, Dawood A, et al. (2017) Analysis of Transition from HCCI to CI via PPC with Low Octane Gasoline Fuels Using Optical Diagnostics and Soot Particle Analysis. SAE Technical Paper Series. Available: http://dx.doi.org/10.4271/2017-01-2403.

Acknowledgements
This work was funded by competitive research funding from King Abdullah University of Science and Technology (KAUST) under the Clean Combustion Research Center’s research program. We also acknowledge funding from KAUST and Saudi Aramco under the FUELCOM2 program. Finally, we would like to express our gratitude to our Research Technician, Adrian. I. Ichim and Riyad Jambi for their support in carrying out the experiments at KAUST engine lab.

Publisher
SAE International

Journal
SAE Technical Paper Series

Conference/Event Name
SAE 2017 International Powertrains, Fuels and Lubricants Meeting, FFL 2017

DOI
10.4271/2017-01-2403

Additional Links
https://saemobilus.sae.org/content/2017-01-2403

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