Citation: HE Jiu-Ning, LI You-Liang, ZHANG Chang-Hua, LI Ping, LI Xiang-Yuan. Shock Tube Ignition Delay Measurements of Decalin/Air Mixtures at High Temperatures[J]. Acta Physico-Chimica Sinica, ;2015, 31(5): 836-842. doi: 10.3866/PKU.WHXB201503121 shu

Shock Tube Ignition Delay Measurements of Decalin/Air Mixtures at High Temperatures

1.
1 Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, P. R. China;
2 College of Chemical Engineering, Sichuan University, Chengdu 610065, P. R. China

Received Date: 28 November 2014
Available Online: 12 March 2015
Fund Project: 国家自然科学基金(91441132)资助项目 (91441132)

Ignition delay measurements of gas-phase decalin/air mixtures were performed in a shock tube at temperatures of 950-1395 K, pressures of 1.82×10⁵ to 6.56×10⁵ Pa, and equivalence ratios of 0.5, 1.0, and 2.0. The ignition delay time was determined using the reflected shock wave pressure and CH^* emission monitored at the sidewall. The effects of temperature, pressure, and equivalence ratio on the ignition delay time of decalin were investigated systematically. The results show that increasing the temperature or pressure decreases the ignition delay time. Opposite ignition delay dependences on the equivalence ratio were observed for decalin/air at high and low pressures, for the first time. At 15.15×10⁵ Pa, the fuel-rich mixture showed the shortest ignition delay time, and the fuel-lean mixture gave the longest one. However, at 2.02×10⁵ Pa, the fuelrich mixture had the longest ignition delay time. Comparisons of the experimental data with predictions based on the available kinetic mechanism were made; the trends in the experimental data were in od agreement with the predictions under all conditions studied. A sensitivity analysis was performed to obtain insights into the effects of the equivalence ratio on the ignition delay time at low and high pressures. The results show that ignition is mainly controlled by the reaction H+O₂=OH+O at 2.02×10⁵ Pa. However, the reactions involving decalin and its corresponding radicals play important roles at 15.15×10⁵ Pa.
- Decalin,
- Ignition delay time,
- Shock tube,
- Sensitivity analysis,
- Kinetic mechanism
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