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The Auto-Ignition Behaviors and Thermal Safety of the Composite Modified Double Base Propellants under Rapid Heating SCIE
期刊论文 | 2021 | PROPELLANTS EXPLOSIVES PYROTECHNICS
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Abstract :

The safety issue of energetic materials (EMs) such as propellants or explosives has been a high concern. When EMs are subjected to rapid thermal stimulus, they will ignite or explode, which may cause personal injury and property loss. Studies on auto-ignition behaviors and thermal safety of EMs under rapid thermal stimulation provide important guidelines for EMs in their production, transportation, storage, and application. In this work, auto-ignition experiments of the composite modified double base (CMDB) propellants, which include 1,1-diamino-2,2-dinitroethylene (FOX-7) and hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) mixtures under high initial temperature condition, have been conducted by using a rapid compression machine (RCM). The temperature rise rate can reach up to 2x10(4) K/s. Pressure evolution recording and high speed-visualization were synchronized to reveal the auto-ignition behaviors of CMDB samples. Results show that the end of compression (EOC) temperature and pressure have a significant impact on the ignition delay time (IDT). The IDT increases with a decrease in temperature and pressure. In addition, through tuning the EOC temperature and pressure, the critical condition that separates the ignition region and non-ignition region is obtained. The critical ignition temperature of CMDB decreases with an increase in pressure. When the pressure is higher than 2.0 MPa, the critical temperature is about 650 K.

Keyword :

Critical Condition Thermal Safety Ignition Delay Time Rapid Compression Machine

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GB/T 7714 Yang, Meng , Liao, Caiyue , Mai, Zhaoming et al. The Auto-Ignition Behaviors and Thermal Safety of the Composite Modified Double Base Propellants under Rapid Heating [J]. | PROPELLANTS EXPLOSIVES PYROTECHNICS , 2021 .
MLA Yang, Meng et al. "The Auto-Ignition Behaviors and Thermal Safety of the Composite Modified Double Base Propellants under Rapid Heating" . | PROPELLANTS EXPLOSIVES PYROTECHNICS (2021) .
APA Yang, Meng , Liao, Caiyue , Mai, Zhaoming , Tang, Chenglong , Han, Wenhu , Wang, Cheng et al. The Auto-Ignition Behaviors and Thermal Safety of the Composite Modified Double Base Propellants under Rapid Heating . | PROPELLANTS EXPLOSIVES PYROTECHNICS , 2021 .
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From heart drug to propellant fuels: Designing nitroglycerin-ionic liquid composite as green high-energy hypergolic fluids EI SCIE
期刊论文 | 2021 , 233 | COMBUSTION AND FLAME
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New-generation green bipropellants based on ionic liquids for aircraft have attracted the attention of researchers. However, the major defects of ionic liquid propellants are their low specific impulse and incomplete combustion, which limits their practical application. In this work, a series of novel hypergolic fluids were prepared by mixing oxygen-rich nitroglycerin (NG) with fuel-rich dicyanamide-based ionic liquids. The complete dissolution of NG in ionic liquids makes these hypergolic fluids became selfsupplying oxygen composite fuels, which generate much less solid residual products than pure hypergolic ionic liquids (HILs). Moreover, the addition of NG inhibited the micro-explosion between fuel and white fuming nitric acid (WFNA), extended the contact time between fuel and oxidizer. And a proper amount of NG in the fuel could suppress the secondary combustion. These composite fuels have high density ( > 1 g cm -3 ), low viscosity (as low as 13.49 cP), wide liquid operating ranges and acceptable ignition delay time. Additionally, the specific impulses of the composite fuels were higher than pure HILs. For the first time, this work provides a simple and reliable method to control the ignition properties of HIL by adding oxygen-enriched additives. (c) 2021 The Combustion Institute. Published by Elsevier Inc. All rights reserved.

Keyword :

Ionic liquids Drop Test Nitroglycerin Hypergolic ignition

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GB/T 7714 Wang, Zhi , Wang, Binshen , Guo, Yang et al. From heart drug to propellant fuels: Designing nitroglycerin-ionic liquid composite as green high-energy hypergolic fluids [J]. | COMBUSTION AND FLAME , 2021 , 233 .
MLA Wang, Zhi et al. "From heart drug to propellant fuels: Designing nitroglycerin-ionic liquid composite as green high-energy hypergolic fluids" . | COMBUSTION AND FLAME 233 (2021) .
APA Wang, Zhi , Wang, Binshen , Guo, Yang , Jin, Yunhe , Fei, Lihan , Huang, Shi et al. From heart drug to propellant fuels: Designing nitroglycerin-ionic liquid composite as green high-energy hypergolic fluids . | COMBUSTION AND FLAME , 2021 , 233 .
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Theoretical studies on the initial reaction kinetics and mechanisms ofp-,m- ando-nitrotoluene EI SCIE PubMed
期刊论文 | 2021 , 23 (8) , 4658-4668 | Physical Chemistry Chemical Physics
WoS CC Cited Count: 1
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The potential energy surfaces (PESs) of three nitrotoluene isomers, such asp-nitrotoluene,m-nitrotoluene, ando-nitrotoluene, have been theoretically built at the CCSD(T)/CBS level. The geometries of reactants, transition states (TSs) and products are optimized at the B3LYP/6-311++G(d,p) level. Results show that reactions of -NO2isomerizing to ONO, and C-NO2bond dissociation play important roles among all of the initial channels forp-nitrotoluene andm-nitrotoluene, and that the H atom migration and C-NO2bond dissociation are dominant reactions foro-nitrotoluene. In addition, there exist pathways for three isomer conversions, but with high energy barriers. Rate constant calculations and branching ratio analyses further demonstrate that the isomerization reactions of O transfer are prominent at low to intermediate temperatures, whereas the direct C-NO2bond dissociation reactions prevail at high temperatures forp-nitrotoluene andm-nitrotoluene, and that H atom migration is a predominant reaction foro-nitrotoluene, while C-NO2bond dissociation becomes important by increasing the temperature. © the Owner Societies 2021.

Keyword :

Isomerization Dissociation Isomers Potential energy Plants (botany) Quantum chemistry Rate constants Reaction intermediates

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GB/T 7714 Yang, Meng , Liao, Caiyue , Tang, Chenglong et al. Theoretical studies on the initial reaction kinetics and mechanisms ofp-,m- ando-nitrotoluene [J]. | Physical Chemistry Chemical Physics , 2021 , 23 (8) : 4658-4668 .
MLA Yang, Meng et al. "Theoretical studies on the initial reaction kinetics and mechanisms ofp-,m- ando-nitrotoluene" . | Physical Chemistry Chemical Physics 23 . 8 (2021) : 4658-4668 .
APA Yang, Meng , Liao, Caiyue , Tang, Chenglong , Zhang, Peng , Huang, Zuohua , Li, Jianling . Theoretical studies on the initial reaction kinetics and mechanisms ofp-,m- ando-nitrotoluene . | Physical Chemistry Chemical Physics , 2021 , 23 (8) , 4658-4668 .
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The auto-ignition behaviors of HMX/NC/NG stimulated by heating in a rapid compression machine EI SCIE
期刊论文 | 2021 , 288 | Fuel
WoS CC Cited Count: 4
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Abstract :

In this work, we have for the first time, applied a rapid compression machine (RCM) to generate initial uniformly high temperature environment to investigate the auto-ignition behaviors of solid energetic material (HMX/NC/NG). Pressure evolution recording and high speed visualization were synchronized to reveal the response of energetic material to thermal stimulus in a time scale of the order of 100 ms. Results show that at sufficiently high end of compression (EOC) pressure and temperature, auto-ignition of solid energetic material is observed after certain period of induction time upon EOC. The ignition delay time defined by the first flame spot observation from high speed imaging (IDTI) is smaller than defined by the maximum pressure rise rate instant (IDTP). However, both IDTI and IDTP decrease with the increase of EOC pressure and temperature. In addition, the burning duration also decreases, indicating a faster burning rate. By tuning the EOC pressure and temperature, the critical thermodynamic condition that separates the auto-ignition region and the non-ignition regime is obtained. The present method of thermal stimulus generation is believed to provide a new approach for evaluating the thermal stability of energetic materials, beyond the literature on cook-off test approaches. © 2020 Elsevier Ltd

Keyword :

Temperature Thermodynamic stability

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GB/T 7714 Yang, Meng , Liao, Caiyue , Tang, Chenglong et al. The auto-ignition behaviors of HMX/NC/NG stimulated by heating in a rapid compression machine [J]. | Fuel , 2021 , 288 .
MLA Yang, Meng et al. "The auto-ignition behaviors of HMX/NC/NG stimulated by heating in a rapid compression machine" . | Fuel 288 (2021) .
APA Yang, Meng , Liao, Caiyue , Tang, Chenglong , Xu, Siyu , Li, Heng , Huang, Zuohua . The auto-ignition behaviors of HMX/NC/NG stimulated by heating in a rapid compression machine . | Fuel , 2021 , 288 .
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Subpatterns of Thin-Sheet Splash on a Smooth Surface EI SCIE PubMed Scopus
期刊论文 | 2020 , 36 (18) , 4917-4922 | LANGMUIR | IF: 3.882
WoS CC Cited Count: 4 SCOPUS Cited Count: 3
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Abstract :

When a droplet impacts a smooth solid surface with a sufficiently high inertia, a thin sheet is created and the whole droplet fluid then breaks apart. Latka, A. [Thin-sheet creation and threshold pressures in drop splashing. Soft Matter 2017, 13, 740-747] defined it as thin-sheet splash. In this work, we used a high-speed camera with a long-distance microscope and experimentally showed that thin-sheet splash can be subdivided into three distinct patterns in terms of breakup location. Specifically, pattern 1 is characterized by the breakup of the rim with the thin sheet being intact, pattern 2 by the almost simultaneous breakup of both the rim and the thin sheet, and pattern 3 by the breakup of the thin sheet followed by the breakup of the rim. The effects of the Weber number and the Ohnesorge number on the transitions of these subpatterns were determined over large ranges of their values, and a regime nomogram in the parametric space of We-Oh was obtained.

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GB/T 7714 Qin, Mengxiao , Tang, Chenglong , Guo, Yang et al. Subpatterns of Thin-Sheet Splash on a Smooth Surface [J]. | LANGMUIR , 2020 , 36 (18) : 4917-4922 .
MLA Qin, Mengxiao et al. "Subpatterns of Thin-Sheet Splash on a Smooth Surface" . | LANGMUIR 36 . 18 (2020) : 4917-4922 .
APA Qin, Mengxiao , Tang, Chenglong , Guo, Yang , Zhang, Peng , Huang, Zuohua . Subpatterns of Thin-Sheet Splash on a Smooth Surface . | LANGMUIR , 2020 , 36 (18) , 4917-4922 .
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The auto-ignition boundary of ethylene/nitrous oxide as a promising monopropellant EI SCIE Scopus
期刊论文 | 2020 , 221 , 64-73 | Combustion and Flame | IF: 4.185
WoS CC Cited Count: 6 SCOPUS Cited Count: 9
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C2H4/N2O has recently been proposed as a promising monopropellant for hydrazine replacement. In this work, the auto-ignition capability of argon diluted C2H4/N2O was experimentally investigated firstly in a rapid compression machine by detecting the light emission and the pressure evolution profiles. The auto-ignition boundary temperature which separates the non-ignition and successful ignition cases was then determined and modeled as a function of pressure and mixture composition. Results show that the auto-ignition temperature decreases with the increase of pressure and increases with the argon dilution fraction and fuel oxidizer ratio. In addition, for successful auto-ignition cases, the ignition delay times were measured and used to validate several recently developed kinetic mechanisms. A mechanism was developed and showed good agreement with the measured ignition delay time as well as the auto-ignition boundary temperature at all test conditions. Finally, the auto-ignition boundary temperatures at practical rocket engine conditions (without dilution) were numerically predicted at various pressure and fuel oxidizer ratio conditions. The model is of merit for designing the cooling system and the local flow residence time to reduce the risk of fuel line explosion and the resonance acoustic induced combustion instability in practical rocket engine. © 2020

Keyword :

Ignition Argon Ethylene Rockets Nitrogen compounds Monopropellants Engines

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GB/T 7714 Yang, Meng , Yang, Yue , Liao, Caiyue et al. The auto-ignition boundary of ethylene/nitrous oxide as a promising monopropellant [J]. | Combustion and Flame , 2020 , 221 : 64-73 .
MLA Yang, Meng et al. "The auto-ignition boundary of ethylene/nitrous oxide as a promising monopropellant" . | Combustion and Flame 221 (2020) : 64-73 .
APA Yang, Meng , Yang, Yue , Liao, Caiyue , Tang, Chenglong , Zhou, Chong-Wen , Huang, Zuohua . The auto-ignition boundary of ethylene/nitrous oxide as a promising monopropellant . | Combustion and Flame , 2020 , 221 , 64-73 .
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Experimental and Kinetic Study of the Promoting Effect of Nitrogen Dioxide on Ethane Autoignition in a Rapid Compression Machine EI CPCI-S SCIE Scopus
会议论文 | 2020 , 34 (6) , 7509-7521 | International Symposium on Clean Energy and Advanced Carbon Materials (CEAM) | IF: 3.605
WoS CC Cited Count: 2 SCOPUS Cited Count: 3
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Abstract :

Nitrogen oxides (NOx: NO2 and NO) are the main pollutants produced in combustion. Previous studies have focused on the NOx forming mechanism and control strategies but have paid less attention to the interaction between NOx and hydrocarbon fuels; even a small amount of NOx can significantly affect the ignitions of hydrocarbons. The ignition characteristic is of great importance for the optimization design and operation control of engines such as diesel engines, which are affected by the self-ignition characteristics of fuels. In this study, a rapid compression machine was used to measure the ignition delay times of seven fuel-lean C2H6/O-2/Ar mixtures with [NO2]/[C2H6] ranging from 0.0 to 50% at T-c = 760-970 K and P-c = 30 bar. The results exhibit no negative temperature coefficient phenomenon in the ignition of ethane with or without NO2. A great reduction in the ignition delay time and the global activation energy is observed in the presence of NO2, which becomes more noticeable with increasing the NO2 concentration. Subsequently, four literature models involving the C2H6/NO2 chemistry were validated against the new measurements. Moreover, the key elementary reactions and important reaction channels controlling the ignition of C2H6/NO2 mixtures were then identified by the detailed chemical kinetic analysis.

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GB/T 7714 Deng Fuquan , Zhao Ningbo , Wu Yingtao et al. Experimental and Kinetic Study of the Promoting Effect of Nitrogen Dioxide on Ethane Autoignition in a Rapid Compression Machine [C] . 2020 : 7509-7521 .
MLA Deng Fuquan et al. "Experimental and Kinetic Study of the Promoting Effect of Nitrogen Dioxide on Ethane Autoignition in a Rapid Compression Machine" . (2020) : 7509-7521 .
APA Deng Fuquan , Zhao Ningbo , Wu Yingtao , Yang Jialong , Tang Chenglong , Li Zhiming et al. Experimental and Kinetic Study of the Promoting Effect of Nitrogen Dioxide on Ethane Autoignition in a Rapid Compression Machine . (2020) : 7509-7521 .
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Nitromethane pyrolysis and oxidation in a jet-stirred reactor: Experimental measurements, kinetic model validation and interpretation EI SCIE Scopus
期刊论文 | 2020 , 263 | FUEL | IF: 6.609
WoS CC Cited Count: 1 SCOPUS Cited Count: 3
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A jet-stirred reactor was used to investigate the nitromethane pyrolysis and oxidation characteristics over the temperature range of 675-1250 K at atmospheric pressure. Mole fraction profiles of reactants, intermediate hydrocarbon species and products were identified using gas chromatography and gas chromatography-mass spectrometer. Results show that the fuel begins to be destructed at around 725 K and completely vanishes at 900 K for all experimental conditions. Pyrolysis of nitromethane as a function of temperature shows three distinct regions for H-2, CO and C2H4 species. In addition, a negative temperature coefficient (NTC) behavior of CO2 species for nitromethane oxidation was observed, which has never been reported previously. The NTC region of CO2 species extends with the increase of equivalence ratio. These measured data were then used to validate several recently developed models of nitromethane. Results show that the model of Mathieu et al. (Mathieu et al. Fuel 182(2016):597) predicts the measured data well at low temperature (below 900 K) for all conditions. However, at intermediate temperature Mathieu model predicted intermediated species and main products deviate noticeably from measured data. Detailed reaction pathway analysis was conducted to direct future model refinement. Results show that the deviation between model predictions and measurements at intermediate temperature may be attributed to the reactions that involve the H and OH radicals. Further comparisons of the sensitive reactions for H and OH formations from different literatures were conducted, and large deviations in rate constants among these reactions suggest the directions of future model refinement.

Keyword :

Oxidation Jet-stirred reactor Kinetic model analysis Nitromethane Pyrolysis

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GB/T 7714 Yang, Meng , Gao, Zhongquan , Tang, Chenglong et al. Nitromethane pyrolysis and oxidation in a jet-stirred reactor: Experimental measurements, kinetic model validation and interpretation [J]. | FUEL , 2020 , 263 .
MLA Yang, Meng et al. "Nitromethane pyrolysis and oxidation in a jet-stirred reactor: Experimental measurements, kinetic model validation and interpretation" . | FUEL 263 (2020) .
APA Yang, Meng , Gao, Zhongquan , Tang, Chenglong , Xu, Zhaohua , Gao, Zhenhua , Hu, Erjiang et al. Nitromethane pyrolysis and oxidation in a jet-stirred reactor: Experimental measurements, kinetic model validation and interpretation . | FUEL , 2020 , 263 .
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On the Second Explosion Limits of Hydrogen, Methane, Ethane, and Propane SCIE PubMed Scopus
期刊论文 | 2020 , 5 (30) , 19268-19276 | ACS OMEGA | IF: 3.512
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In this work, we have first investigated the explosion limit behaviors from hydrogen to propane through numerical simulations and validated with the available experimental data. The shape of the explosion limit curves and the possible turning points (P1-2, T1-2), first to second limit transition, and (P2-3, T2-3), second to third limit transition that bound the second explosion limit as a function of the fuel carbon number, have been examined. Results show that with an increase of methane mole fraction in the hydrogen/methane system, the upper turning point (P1-2, T1-2) remains almost unchanged and the lower transition point (P2-3, T2-3) rotates counterclockwise around (P1-2, T-1-(2)). With a further increase of carbon number, (P1-2, T1-2) moves to the lower-pressure and -temperature region and (P2-3, T2-3) gradually moves to the lower-pressure and higher-temperature region. The slope of the second explosion limit is inversely proportional to the carbon number, k(PT) = 0.0069 - 0.005/(X-c - 0.7), approximately. Second, a sensitivity analysis has been conducted to study the elementary reaction on the second explosion limits. The results show that the chain branching and termination reactions governing the explosion limit of hydrogen have a little effect on the second explosion limit of methane. The C2H5O2H decomposition to form OH radicals is dominant in controlling the nonmonotonic behavior of the second explosion limit of C2H6. The second explosion limit behavior of propane is governed by three sets of reactions in the low-temperature oxidation process.

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GB/T 7714 Liu, Jie , Yu, Ruiguang , Ma, Biao et al. On the Second Explosion Limits of Hydrogen, Methane, Ethane, and Propane [J]. | ACS OMEGA , 2020 , 5 (30) : 19268-19276 .
MLA Liu, Jie et al. "On the Second Explosion Limits of Hydrogen, Methane, Ethane, and Propane" . | ACS OMEGA 5 . 30 (2020) : 19268-19276 .
APA Liu, Jie , Yu, Ruiguang , Ma, Biao , Tang, Chenglong . On the Second Explosion Limits of Hydrogen, Methane, Ethane, and Propane . | ACS OMEGA , 2020 , 5 (30) , 19268-19276 .
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Evaluation of non-ideal piston stopping effects on the 'adiabatic core' and ignition delay time simulation in rapid compression machines EI SCIE Scopus
期刊论文 | 2020 , 218 , 229-233 | Combustion and Flame | IF: 4.185
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Piston creep and rebound are two non-ideal piston stopping behaviors in the rapid compression machine. Compared to nominal piston stopping, piston rebound/creep will result in a smaller/bigger ‘adiabatic’ core zone volume in the reaction chamber and length/shorten the ignition delay time measurements. However, the ‘adiabatic core’ hypothesis can still be validated under these compressions and ensures the applicability of zero-dimensional method in the model simulation. © 2020 The Combustion Institute

Keyword :

Pistons Ignition

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GB/T 7714 Wu, Yingtao , Tang, Chenglong , Yang, Meng et al. Evaluation of non-ideal piston stopping effects on the 'adiabatic core' and ignition delay time simulation in rapid compression machines [J]. | Combustion and Flame , 2020 , 218 : 229-233 .
MLA Wu, Yingtao et al. "Evaluation of non-ideal piston stopping effects on the 'adiabatic core' and ignition delay time simulation in rapid compression machines" . | Combustion and Flame 218 (2020) : 229-233 .
APA Wu, Yingtao , Tang, Chenglong , Yang, Meng , Wang, Quan-de , Huang, Zuohua , Zhao, Peng et al. Evaluation of non-ideal piston stopping effects on the 'adiabatic core' and ignition delay time simulation in rapid compression machines . | Combustion and Flame , 2020 , 218 , 229-233 .
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