Imaging studies of in-cylinder HCCI combustion

Pawel LUSZCZ, Hongming XU, Mirek WYZSNSKI, Xiao MA, Rob STEVENS, Athanasios TSOLAKIS

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Front. Energy ›› 2011, Vol. 5 ›› Issue (3) : 313-321. DOI: 10.1007/s11708-011-0154-x
RESEACH ARTICLE

Imaging studies of in-cylinder HCCI combustion

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Abstract

An optically accessed, single cylinder engine operated in homogenous charge compression ignition (HCCI) mode with negative valve overlap (NVO) strategy was used to perform combustion processes diagnostics under premixed conditions corresponding to the low load regime of the HCCI operational envelope. The aforementioned processes analysis was conducted utilizing synchronized simultaneous combustion event crank-angle resolved images, acquired through piston crown window with in-cylinder pressure recording. This investigation was carried out for one-step ignition fuel—standard gasoline, fuel proceeding single-stage ignition process under conditions studied. The initial combustion stage is characterized by a maximum local reaction spreading velocity in the range of 40–55 m/s. The later combustion stage reveals values as high as 140 m/s in case of stoichiometric combustion. The mixture as well as combustion stages effects are pronounced in these observed analytical results.

Keywords

high speed imaging / combustion / homogenous charge compression ignition (HCCI) / reaction spreading velocity

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Pawel LUSZCZ, Hongming XU, Mirek WYZSNSKI, Xiao MA, Rob STEVENS, Athanasios TSOLAKIS. Imaging studies of in-cylinder HCCI combustion. Front Energ, 2011, 5(3): 313‒321 https://doi.org/10.1007/s11708-011-0154-x

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Acknowledgements

The authors gratefully acknowledge Jaguar Land Rover for financial and technical support in this research and the Phantom v7.1 CMOS camera loan granted from the Engineering Instrument Loan Pool of the EPSRC. They would like to thank Prof. Bengt Johansson and Dr Hakan Persson of Lund Institute of Technology for insightful discussions of reacting structures spreading velocities. Help from engine technicians Peter Thornton and Carl Hingley of the University of Birmingham is also gratefully acknowledged.

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg
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