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5341018 
Journal Article 
Autoignition of n-Hexane, Cyclohexane, and Methylcyclohexane in a Constant Volume Combustion Chamber 
Han, D; Zhai, J; Huang, Z 
2019 
Yes 
Energy and Fuels
ISSN: 0887-0624
EISSN: 1520-5029 
AMER CHEMICAL SOC 
WASHINGTON 
33 
4 
3576-3583 
English 
WOS:000465486100088 
The autoignition behaviors of n-hexane, cyclohexane, and methylcyclohexane were experimentally determined and compared in a heated constant volume combustion chamber. The combustion pressures, heat release rates, and ignition and combustion delay times in the autoignition processes of these three fuels were compared in the context of changed chamber temperature, chamber pressure, and injection duration. The experimental results showed that n-hexane had the highest ignition propensity, followed by methylcyclohexane and cyclohexane. Compared to cyclohexane, the existence of methyl group in methylcyclohexane significantly increased the fuel autoignition tendency. Ambient pressure and temperature showed significant effects on fuel ignition timing and heat release histories. Generally, elevated ambient pressure and temperature led to reduced ignition and combustion delays. However, turnover temperatures existed in the ignition and combustion delays of cyclohexane, with ignition and combustion delays extended over these critical temperatures. Changes in fuel injection duration in this study showed a secondary impact on fuel ignition. Increased fuel injection duration slightly extended the ignition delay time at lower chamber temperatures but shortened the combustion delay times and resulted in higher peak heat release rates.