Spark ignition probability and minimum ignition energy transition of the lean iso-octane/air mixture in premixed turbulent combustion

2018 ◽  
Vol 187 ◽  
pp. 87-95 ◽  
Author(s):  
Long Jie Jiang ◽  
Shenqyang (Steven) Shy ◽  
Minh Tien Nguyen ◽  
Shih Yao Huang ◽  
De Wei Yu
Keyword(s):  
Turbulent Combustion ◽  
Energy Transition ◽  
Spark Ignition ◽  
Ignition Energy ◽  
Minimum Ignition Energy ◽  
Ignition Probability ◽  
Premixed Turbulent Combustion

Effect of Turbulence On Forced Ignition of Jet-A/Air Mixtures

2021 ◽  
Author(s):  
Kaz Teope ◽  
David L. Blunck
Keyword(s):  
Confidence Interval ◽  
Turbulence Intensity ◽  
Reasonable Agreement ◽  
Infrared Camera ◽  
Heat Diffusion ◽  
Prior Work ◽  
Ignition Energy ◽  
Minimum Ignition Energy ◽  
Ignition Probability

Abstract Consistent ignition of reactive mixtures in turbulent conditions continues to be a challenge, particularly for large, multi-component fuels. Prior work has shown that turbulence can affect ignition parameters such as flame speed, mixture temperature, and minimum ignition energy. However, these works have primarily considered small, single-component fuels. This work studies the effect of turbulence on forced ignition of jet-A/air mixtures with f between 0.3 and 0.7. The ignition probability of these mixtures was measured for bulk velocities between 5 and 7 m/s and turbulence intensities between 3% and 9%. A FLIR SC6700 infrared camera was used to measure the radiation intensity emitted by the flame kernels. Increases in turbulence intensity between 3% and 4% cause the probability of ignition to generally increase. This increase is attributed to the negative flame stretch that develops as a result of the turbulence. This observation is significant because it shows that turbulence can facilitate ignition for jet-A/air mixtures. In contrast, increasing turbulence beyond 5% causes ignition probabilities to decrease. This reduction occurs due to the increased role of heat diffusion and the associated reduction in kernel temperature. The sensitivities of ignition behavior to turbulence intensity and fuel chemistry are reasonably captured using the Peclet number. Further agreement in ignition behavior is achieved by considering Pe/TI2. Ignition probability data for two additional fuels were compared using Pe/TI2. Reasonable agreement within a 95% confidence interval was observed for CH4 mixtures but not for C3H8 mixtures.

scholarly journals Experimental Study on Ignition Characteristics of RP-3 Jet Fuel Using Nanosecond Pulsed Plasma Discharge

Energies ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6463
Author(s):  
Xiaoyang Guo ◽  
Erjiang Hu ◽  
Xiaotian Li ◽  
Geyuan Yin ◽  
Zuohua Huang
Keyword(s):  
Initial Conditions ◽  
Plasma Discharge ◽  
Jet Fuel ◽  
Pulsed Plasma ◽  
Ignition Energy ◽  
Minimum Ignition Energy ◽  
Experimental Conditions ◽  
Ignition Probability ◽  
Ignition Characteristics ◽  
The Impact

A study on forced ignition characteristics of RP-3 jet fuel-air mixture was conducted around a constant volume combustion vessel and a nanosecond pulsed plasma discharge power supply. Experiments were carried out at different initial pressures (pu = 0.2, 0.3, 0.5 atm), equivalence ratios (ϕ = 0.7, 0.8, 1.1), steam concentrations (ZH2O = 0%, 10%, 15%) and oxygen concentrations (ZO2 = 13.5%, 16%, 21%). The relationship between ignition probability and ignition energy is investigated. The experimental results show that the decrease in pressure, equivalence ratio, oxygen concentration and the increase in steam concentration all lead to an increase in minimum ignition energy (MIE). In order to further analyze the experimental data, one existing fitting equation is reformed with the initial conditions taken into account. Multivariate fitting is carried out for different conditions, and the fitting results of ignition probability are in good agreement with the experiments. The MIE results under different experimental conditions are figured out with the new fitting equation. The impact indexes, which stand for the effects of different factors, are also calculated and compared in present work.

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