Article
Engineering, Aerospace
Zhengda Han, Jingjing Fan, Yaorui Shen, Qi Liu, Jingping Liu, Jianqin Fu
Summary: The study investigates the ignition characteristics of tri-fuel and the influence of trace diesel. The results show that an increase in pressure reduces the ignition delay time, NC16H34 has the greatest impact on ignition, and A2CH3 has the most complex reaction pathways. Trace diesel exhibits a stop changing effect during ignition.
AEROSPACE SCIENCE AND TECHNOLOGY
(2022)
Article
Energy & Fuels
Haitao Lu, Fuqiang Liu, Kaixing Wang, Gang Xu, Henry J. Curran
Summary: A semi-detailed mechanism was used to calculate the minimum ignition energy (MIE) of methane-air mixtures using ANSYS Fluent software in this paper. The effects of isothermal and adiabatic wall conditions, equivalence ratio, and electrode wall temperature on the MIE were numerically investigated, showing significant differences in MIE predictions. The numerical results were considered to be considerably more accurate for different equivalence ratios compared to previous studies.
Article
Chemistry, Multidisciplinary
Sergey Vladimirovich Gusev, Andrey Viktorovich Nikoporenko, Vyacheslav Sergeevich Zakharov, Vasily Mikhailovich Ezhov, Alexey Yurievich Varaksin, Leonid Samoilovich Yanovsky, Konstantin Yurievich Arefiev
Summary: The article investigates the impact of adding hydrogen and/or ethylene on the ignition efficiency of methane-air mixtures, using experimental determination and numerical modeling to study the ignition dynamics. Results show that adding hydrogen and ethylene could reduce the ignition delay period of methane-air mixtures.
APPLIED SCIENCES-BASEL
(2021)
Article
Thermodynamics
Shengnan Li, Juntang Zhang, Shumeng Xie, Ke Gao, Huangwei Zhang
Summary: The autoignition of a methane/air mixture loaded with uniform coal particles is simulated using the Eulerian-Lagrangian method. The study investigates the impacts of particle diameter, particle concentration, and initial gas pressure on the ignition process of the two-phase mixture. The results show that the particle size has a nonmonotonic effect on the ignition delay time of the two-phase mixture, and the differences in ignition delays decrease as the particle concentration increases. Additionally, the two-phase mixture is more easily ignited under high pressure conditions, with the particle ignition being more sensitive to pressure change than the gas ignition. The findings of this study are significant for explosion hazard mitigation and propulsion systems with pulverized solid fuels.
COMBUSTION AND FLAME
(2023)
Article
Energy & Fuels
Jizhen Zhu, Mohsin Raza, Jing Li, Sixu Wang, Yebing Mao, Yuan Feng, Yong Qian, Liang Yu, Xingcai Lu
Summary: Autoignition characteristics of methane/diesel mixtures were investigated under different conditions, with diesel content and reflected-shock pressure significantly affecting ignition delay times. The addition of diesel resulted in a pronounced reduction in ignition time for methane, especially at intermediate temperatures.
Article
Thermodynamics
Jinhu Liang, Ruining He, Shijie Zheng, Fei Li, Yang Li, Jonatas Vicente, Amir Antonio Martins de Oliveira, Amir De Toni Jr, Xin Bai, Xuebin Wang, Qian Yan
Summary: A new chemical kinetic mechanism of DMF has been proposed and experimentally evaluated for ignition delay times, high temperature pyrolysis, and laminar flame speeds. The results provide insights into the combustion characteristics of DMF and potential refinements for the proposed mechanism.
COMBUSTION AND FLAME
(2022)
Article
Optics
Yuji Ikeda
Summary: A semiconductor microwave device that generates burst microwaves at a sub-microsecond duration has been successfully applied in a breakdown plasma spectrometer. Coupling the microwave with laser sparks and electric sparks amplifies the weak and transient sparks in laser-induced breakdown spectroscopy and spark-induced breakdown spectroscopy, resulting in tunable plasma intensity and sustained production of hydroxyl radicals.
Article
Thermodynamics
Jizhen Zhu, Jing Li, Sixu Wang, Mohsin Raza, Yong Qian, Yuan Feng, Liang Yu, Yebing Mao, Xingcai Lu
Summary: The study explores the ignition delay time measurements of methane/diesel mixtures with varying diesel substitution ratios, showing typical two-stage autoignition characteristics and a crossover of IDTs at high temperature. Diesel has a non-linear promoting effect on IDTs, while competition between methane and diesel for OH radicals inhibits the consumption of diesel and promotes the depletion of methane.
COMBUSTION AND FLAME
(2021)
Article
Chemistry, Applied
Yonghong Yan, Rui Sun, Liutao Sun, Wenkun Zhu, Dengke Chen
Summary: This study evaluated the effect of primary air velocity on the ignition characteristics of bituminous coal and semicoke mixture, indicating that convection heating was more important than radiant heating for fuel ignition. The optimized flame stability was achieved at a primary air velocity of 18 m/s, and a recommended PAV of no more than 22 m/s for co-firing bituminous coal with a large proportion of semicoke.
FUEL PROCESSING TECHNOLOGY
(2022)
Article
Energy & Fuels
Zhipeng Yuan, Linming Xie, Xingyu Sun, Rumin Wang, Huaqin Li, Jingping Liu, Xiongbo Duan
Summary: This paper numerically simulated the effects of water vapor on the auto-ignition characteristics and laminar flame speed of the methane/air mixture. The results showed that the ignition delay time of the methane/air increased with increasing water vapor ratio, and the laminar flame speed and adiabatic combustion temperature decreased as well.
Article
Engineering, Chemical
Dmitry Pashchenko, Igor Karpilov
Summary: This study investigates the heat transfer inside a steam methane reformer with different shapes of pre-heated Ni-based catalyst pellets. A chemical kinetics model based on experimentally derived reaction rate expressions is developed. The model considers the unsteady flow of reacting mixture over pre-heated Ni-based catalysts under specific initial parameters. It is found that the heat transfer coefficient for a reacting flow is approximately twice higher than that for a non-reacting flow.
Article
Energy & Fuels
Yingtao Wu, Zhi Wang, Lihan Fei, Yang Guo, Yang Liu, Chenglong Tang, Zuohua Huang
Summary: The hypergolic ignition behaviors of [AMIM][DCA]/FA blends reacting with WFNA were investigated using drop test approach, revealing a hypergolic process involving mixing dominant stage, stage with moderate temperature rising and vapor/secondary droplets emerging, and stage with violent temperature rising accompanied by flame occurrence. Two kinds of delay times were used to characterize the hypergolic process and found to be nonmonotonic with the variations of FA fractions. FA, though not hypergolic with WFNA, enhances the hypergolic process of [AMIM][DCA]/FA blends with WFNA due to its physical and chemical properties leading to extensive pre-ignition heat release.
Article
Thermodynamics
Chiara Saggese, Charlotte M. Thomas, Scott W. Wagnon, Goutham Kukkadapu, Song Cheng, Dongil Kang, S. Scott Goldsborough, William J. Pitz
Summary: In this study, an improved kinetic model was developed based on theoretical calculations to enhance understanding of ignition and combustion behavior of C3-C4 alcohols and their blends with gasoline under engine-relevant conditions. The model demonstrated high accuracy in predicting ignition delay times and reactivity variations, highlighting its potential for application in boosted spark-ignition engines.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
Article
Thermodynamics
Jaeyoung Cho, Jon Luecke, Mohammad J. Rahimi, Yeonjoon Kim, Bradley T. Zigler, Seonah Kim
Summary: This study aims to quantify the effect of dilution on the phi-sensitivity of isooctane using a combined experiment-simulation approach. The results showed that the enhancement of phi-sensitivity with dilution strategy was maximized in the low-temperature chemistry regime, increasing phi-sensitivity by 77% with a 28.6% dilution rate. This study is the first experiment-simulation combined research to quantify the effect of dilution on phi-sensitivity, facilitating the kinetics model refinement for better reproduction.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2023)
Letter
Optics
Hongwei Zang, Helong Li, Wei Zhang, Yao Fu, Shanming Chen, Huailiang Xu, Ruxin Li
Summary: Laser ignition technology allows for precise control of ignition timing and location to improve combustion efficiency; this study successfully achieved ignition of a lean methane/air mixture using ultrashort femtosecond lasers with a 100% success rate; by inducing filamentation and early OH radical production, ignition energy was reduced and clear boundaries for ignition cases were established.
LIGHT-SCIENCE & APPLICATIONS
(2021)
Article
Mechanics
Y. A. Baranyshyn, P. N. Krivosheyev, O. G. Penyazkov, K. L. Sevrouk
Article
Chemistry, Physical
D. A. Tropin, E. S. Bochenkov
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2020)
Article
Thermodynamics
Pavel Krivosheyev, Oleg Penyazkov, Aliaksei Sakalou
COMBUSTION AND FLAME
(2020)
Article
Thermodynamics
D. A. Tropin, I. A. Bedarev
Summary: The study proposed physical and mathematical models describing detonation processes in hydrogen-air mixture, based on detailed and reduced kinetics models in one- and two-dimensional formulation. It calculated the interaction of detonation waves with inert particles and revealed types of detonation flows in gas suspension, obtaining volume concentrations and particle diameters causing detonation wave failure. Comparison between one-dimensional and two-dimensional approaches showed quantitative similarity in detonation wave velocity and values causing detonation failure.
COMBUSTION SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Chemical
Dmitry Tropin, Igor Bedarev
Summary: The paper proposed a physical and mathematical model for describing the processes of detonation transition, attenuation, and suppression in hydrogen-air mixture using one- and two-dimensional formulations, considering kinetic of chemical transformations in reactive gases with inert gas plugs. The study showed different flow regimes after shock wave exits from inert gas plug depending on isolating gas type and plug length, including reinitiation of detonation wave, suppression with formation of deflagration wave, and suppression with combustion zone isolation. The effectiveness of detonation suppression by various inert gas plugs was compared, with carbon dioxide being the most efficient for suppressing the detonation wave.
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
(2021)
Article
Thermodynamics
D. A. Tropin, S. A. Lavruk
Summary: The interaction between homogeneous and heterogeneous detonation waves in mixtures of aluminum in oxygen and hydrogen in oxygen with a cloud of water droplets is studied using methods of mechanics of multiphase media. The main interaction mechanisms are determined, including the propagation of an attenuated detonation wave and detonation failure. The critical conditions for detonation propagation in water sheets are found and compared with the results of detonation suppression modeling using clouds of inert particles.
COMBUSTION EXPLOSION AND SHOCK WAVES
(2022)
Article
Chemistry, Physical
Dmitry Tropin
Summary: This study calculated the interaction between a detonation wave in a hydrogen-air mixture and a series of clouds of inert particles with diameters of 1, 10, and 100 mm, and determined the concentration and geometric limits of detonation. It was found that increasing the particle diameter increases the concentration limit and decreases the geometric limit. Moreover, increasing the number of clouds in a series allows for longer gaps between them, facilitating the successful suppression of detonation.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Dmitry Tropin, Valentin Temerbekov
Summary: The study presents the calculation results of detonation propagation in a porous medium for a hydrogen-air mixture. Different modes of detonation propagation were observed depending on the obstacle parameters. It was found that replacing solid plates with finite-size plates can reduce the detonation propagation velocity.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Mechanics
D. A. Tropin, S. A. Lavruk
Summary: Numerical simulation was conducted to investigate the interaction between heterogeneous detonation wave (DW) and a porous insert occupying whole or part of a channel. The main regimes and critical conditions for detonation attenuation and failure in porous zones were obtained for micron and submicron aluminum particles. Differences in detonation propagation regimes for micron and submicron aluminum particles were found. It was discovered that both micron and submicron particles have a critical height of porous free region, which leads to detonation failure. The critical width of the open space between porous bodies, at which detonation failure occurs, was determined. For porous zones with two open spaces, the critical width of the open space is the same as that for one open space. The critical conditions of porous inserts with open space area should be greater than those for porous zones that occupy the entire channel width.
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
(2023)
Article
Thermodynamics
Sergey Lavruk, Dmitry Tropin
Summary: A mathematical model of aluminum heterogeneous detonation interacting with inert porous media was developed. The main interaction regimes between the detonation wave of aluminum particles in oxygen and porous inserts were studied. One- and two-dimensional calculations were conducted for micron and submicron particles, and a comparison was made. The main regimes of detonation interaction with porous zones and the critical conditions for detonation attenuation in porous zones were obtained. The calculations showed that reducing the diameter of burning particles led to an increased volume concentration of inert phase in the porous body for micron particles, which is necessary for detonation attenuation. A main difference in propagation regimes between micron and submicron aluminum particles was found.
COMBUSTION SCIENCE AND TECHNOLOGY
(2023)
Article
Thermodynamics
Dmitry Tropin
Summary: Calculations were conducted on the interaction between plane and cellular detonation waves in a hydrogen-air mixture with inert filters using proposed physical and mathematical models based on detailed and reduced kinetics. The study revealed the realized detonation regimes of attenuation and suppression. A comparison of results showed that reduced kinetics overestimates detonation velocities compared to detailed kinetics, but the concentration limits of detonation are practically equal for both models. The study also found that the suppression of cellular detonation is more difficult to achieve compared to plane detonation waves. A detonation failure criterion was obtained, indicating that an increase in filter particle diameter requires a proportional increase in volume concentration to successfully suppress detonation in both plane and cellular detonation cases.
COMBUSTION SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
V. N. Mironov, O. G. Penyazkov, P. N. Krivosheyev, Y. A. Baranyshyn, E. S. Golomako, S. O. Shumlyaev
HIGH TEMPERATURE MATERIAL PROCESSES
(2020)
Proceedings Paper
Physics, Applied
D. A. Tropin, P. A. Fomin
HIGH-ENERGY PROCESSES IN CONDENSED MATTER (HEPCM 2020)
(2020)
Proceedings Paper
Physics, Applied
D. A. Tropin, E. S. Bochenkov
HIGH-ENERGY PROCESSES IN CONDENSED MATTER (HEPCM 2020)
(2020)
Proceedings Paper
Physics, Applied
Sergey Lavruk, Dmitry Tropin
HIGH-ENERGY PROCESSES IN CONDENSED MATTER (HEPCM 2020)
(2020)