Abstract
Super-knock is one of the major obstacles for improving power density in advanced internal combustion engines (ICE). This work studied the mechanism of super-knock initiation using a rapid compression machine that simulated conditions relevant to ICEs and provided excellent optical accessibility. Based on the high-speed images and pressure traces of the stoichiometric iso-octane/oxygen/nitrogen combustion under high-temperature and high-pressure conditions, it was observed that detonation was first initiated in the near-wall region as a result of shock wave reflection. Before detonation was initiated, the speed of the combustion wave front was less than that of the Chapman–Jouguet (C–J) detonation speed (around 1840 m/s). In the immediate vicinity of the initiation, the detonation speed was much higher than that of the C–J detonation.
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This work is sponsored by the Project of National Natural Science Foundation of China under Grant No. 51576107.
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Communicated by G. Ciccarelli.
This paper is based on work that was presented at the 25th International Colloquium on the Dynamics of Explosions and Reactive Systems, Leeds, UK, August 2–7, 2015.
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Wang, Z., Qi, Y., Liu, H. et al. Shock wave reflection induced detonation (SWRID) under high pressure and temperature condition in closed cylinder. Shock Waves 26, 687–691 (2016). https://doi.org/10.1007/s00193-016-0677-5
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DOI: https://doi.org/10.1007/s00193-016-0677-5