Article
Energy & Fuels
Xin Li, Zhihao Ma, Yifan Jin, Xin Wang, Zhideng Xi, Shiji Hu, Xianglin Chu
Summary: This study aims to investigate the influence of methanol addition on the auto-ignition of ammonia under high temperature and low pressure. The ignition delay times (IDTs) of ammonia/methanol mixtures were studied using a shock tube at different conditions. A simplification model (NH3-M model) was constructed based on the Zhang and FFCM-1 mechanisms, and chemical kinetic analyses were performed. The results showed that the addition of 5% methanol significantly shortened the IDTs of the ammonia/methanol mixtures.
Article
Energy & Fuels
James M. Harman-Thomas, Touqeer Anwar Kashif, Kevin J. Hughes, Mohamed Pourkashanian, Aamir Farooq
Summary: Experimental data on ignition delay times (IDTs) of syngas in CO2 diluted conditions were obtained. It was found that the reaction of CO2 and H to form CO and OH caused the separation of H2 and CO ignition, increasing the complexity of determining the IDTs. A method to determine simulated IDTs was proposed for effective comparison with experimental data.
Article
Energy & Fuels
Xin Li, Xianglin Chu, Zhihao Ma, Yifan Jin, Xin Wang, Zhideng Xi, Shiji Hu, Hao Chen
Summary: In this study, the ignition delay times (IDTs) of ammonia/ethanol mixtures with different ethanol fractions were measured and analyzed. The results showed that ethanol had a nonlinear and strong ignition-enhancing effect on the IDT of ammonia. A new ammonia/ethanol model was proposed to predict the experimental results reliably.
Article
Thermodynamics
Jinhu Liang, Chen Zhao, Ziwen Zhao, Xinhui Wang, Ming-Xu Jia, Quan-De Wang, Yang Zhang, Fengqi Zhao
Summary: This study investigates the high-temperature ignition and pyrolysis characteristics of cyclohexylamine through experimental and kinetic modeling approaches. The results show that the ignition delay times and pyrolysis product distributions of cyclohexylamine are influenced by temperature, pressure, and equivalence ratio. A detailed kinetic mechanism accurately predicts the experimental results. Sensitivity analysis identifies the most sensitive reaction as O2 + H = O + OH, and the abstraction reaction of cyclohexylamine with OH radical also exhibits significant sensitivity coefficients. Reaction path analysis reveals the control role of abstraction reactions in the initial oxidation of cyclohexylamine.
COMBUSTION AND FLAME
(2023)
Article
Thermodynamics
Lingfeng Dai, Yi Yuan, Qianjin Lin, Wenyu Li, Chun Zou, Jiacheng Liu, Jianghui Luo
Summary: The ignition delay times (IDTs) of NH3/DMM mixtures at different DMM blending ratios were measured under specific conditions. A detailed DMM-NH3 model was proposed, which accurately predicted the IDTs and laminar flame speeds of NH3/DMM mixtures. The effects of various reactions, such as prompt NO and reburn reactions, recombination reactions, H-abstraction reactions, and disproportionation reactions, on ignition were discussed in detail.
COMBUSTION AND FLAME
(2023)
Article
Energy & Fuels
Zhongjun Wan, Lei Shi, Dongdong Chen, Ping Li, Changhua Zhang
Summary: In this study, the effects of n-butanol on the auto-ignition of toluene reference fuel have been investigated. It was found that n-butanol promotes the auto-ignition of toluene at high temperatures, but inhibits it at low temperatures. A reliable mechanism for n-butanol/toluene reference fuel has been developed and validated through calculations and experiments. The dominant chain propagating reactions were identified, and an inhibiting reaction at low temperatures was also discovered.
Article
Energy & Fuels
Jinhu Liang, Fei Li, Shutong Cao, Xiaoliang Li, Ming-Xu Jia, Quan-De Wang
Summary: This study presents a comparative experimental and kinetic modeling investigation of high-temperature ignition of three C9H12 fuels. The results provide valuable data and insights into the ignition delay time and chemical kinetics, contributing to the understanding and modeling of alkyl aromatics' combustion chemistry.
Article
Chemistry, Physical
Haneol Lee, Jong Hun Kim, P. R. Deshmukh, Hyung Soo Hyun, Youngku Sohn, Weon Gyu Shin
Summary: In this study, nickel nanoparticles were coated on the surface of boron particles using a spray drying technique, improving the combustion and ignition performance of boron. The nickel-coated boron particles showed advantages in ignition delay time and oxidation performance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Energy & Fuels
Lei Shi, Ping Xu, Rui Wang, Weixin Tang, Tao Ding, Rongpei Jiang, Changhua Zhang
Summary: The ignition delay times of JP-10 in air and the effect of NO2 on JP-10 autoignition were investigated in this study. Experimental results showed that the ignition delay times were influenced by pressure and equivalence ratio. The addition of NO2 promoted or inhibited the ignition of JP-10, depending on the pressure conditions. A chemical kinetic mechanism was developed and validated, and kinetics analyses were performed to further understand the ignition and vitiation effects.
Article
Thermodynamics
Wenyu Li, Chun Zou, Hong Yao
Summary: Oxy-fuel combustion techniques are crucial for reducing greenhouse gas emissions in fossil fuel power plants. In this study, ignition delay time data were measured for stoichiometric syngas mixtures with different CO concentrations in the presence of CO2. The CO2 collision efficiency in reaction H+O2(+M)=HO2(+M) showed high sensitivity to model predictions.
COMBUSTION AND FLAME
(2023)
Article
Thermodynamics
Lei Shi, Dongdong Chen, Zujun Zheng, Ping Xu, Rui Wang, Changhua Zhang
Summary: Vitiation effect is crucial in combustion experiments, with NO2 playing a significant role in affecting the ignition behavior of hydrocarbons like n-heptane. The addition of NO2 can promote n-heptane oxidation and reduce ignition delay times at high temperatures, while having a minimal impact at lower temperatures. The effect of NO2 is dependent on temperature and NO2 concentration levels.
COMBUSTION AND FLAME
(2021)
Article
Chemistry, Physical
Ziyu Wang, Chao Yan, Bowen Mei, Ying Lin, Yiguang Ju
Summary: This study investigates the oxidation of diethyl ether (DEE) under low-temperature and ultra-high-pressure conditions. The experimental data shows that DEE exhibits unusual low-temperature oxidation behavior with two negative temperature coefficient (NTC) zones. Increasing the pressure stabilizes RO2 and promotes HO2 chemistry, resulting in weaker NTC zones. The existing DEE model is updated to improve the predictability of key species, especially at intermediate temperature.
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Energy & Fuels
Dong He, Zhimin Peng, Yanjun Ding
Summary: This study compared the performance of different butane isomers as additives in hydrogen-enriched fuel mixtures through experiments and simulations. The results showed that adding isobutane significantly prolonged ignition delay times compared to n-butane, with differences in CO2 formation pathways at selected time points.
Article
Energy & Fuels
Yifan Jin, Xin Li, Xin Wang, Zhihao Ma, Xianglin Chu
Summary: The contribution of dimethyl ether (DME) to the ignition delay times (IDTs) of ammonia (NH3) was investigated. The experiments were conducted under different pressure, temperature, equivalence ratio, and NH3/DME mixing ratios. The results showed that the addition of DME decreased the IDTs and promoted the reactivity of NH3. The promoting effect of DME on NH3 ignition was weakened under higher temperature and pressure conditions. An updated mechanism was proposed to explain the promoting effect of DME on NH3 ignition, and the numerical analysis showed that it was primarily due to an increase in the rate of production and concentration of the radical pool, especially the OH radical pool.
Article
Thermodynamics
Jianghui Luo, Chun Zou, Qianjin Lin, Wenxiang Xia, Huiruo Zou, Shusen Wang
Summary: Understanding the pyrrole combustion chemistry in O-2/CO2 atmosphere is important for NOx control during pressurized oxy-coal combustion. This study measured the ignition delay times of pyrrole in elevated pressure O-2/CO2 atmospheres and developed a kinetic model that showed improved prediction performance. The effects of equivalence ratio and CO2 on pyrrole oxidation were analyzed for better understanding of combustion processes.
COMBUSTION AND FLAME
(2021)
