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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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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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Abstract :

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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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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Experimental Investigation of Evaporating Spray Macroscopic Characteristics for Gasoline/Diethyl-Ether Blended Fuel EI CSCD
期刊论文 | 2020 , 41 (8) , 2084-2088 | Journal of Engineering Thermophysics | IF: 1.402
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Abstract :

In this research work, the spray macroscopic characteristics of gasoline/diethyl-ether blended fuel were investigated in a constant combustion chamber via schlieren optical setup. Subcritical ambient conditions (0.5 MPa pressure, 349∼516 K temperature) and supercritical condition (3.8 MPa pressure, 516 K temperature) were respectively chose to simulate evaporating spray propagation process. By means of in-house post-processing code, macroscopic characterizing parameters like vapor tip penetration, spray angle and fuel evaporation rate are extracted from raw schlieren images. The results show that under subcritical conditions, blending diethyl-ether into gasoline is prone to enhance fuel evaporation rate at low ambient temperature, while this enhancing effect tends to be mitigated with the increase of ambient temperature. Moreover, when the ambient condition is converted from subcritical state to supercritical state, the evaporating rate of pure diethyl-ether is restrained due to fuel evaporation mechanism. © 2020, Science Press. All right reserved.

Keyword :

Temperature Evaporation Ethers Gasoline

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GB/T 7714 Zhan, Cheng , Tang, Cheng-Long , Tong, Shang-Qing et al. Experimental Investigation of Evaporating Spray Macroscopic Characteristics for Gasoline/Diethyl-Ether Blended Fuel [J]. | Journal of Engineering Thermophysics , 2020 , 41 (8) : 2084-2088 .
MLA Zhan, Cheng et al. "Experimental Investigation of Evaporating Spray Macroscopic Characteristics for Gasoline/Diethyl-Ether Blended Fuel" . | Journal of Engineering Thermophysics 41 . 8 (2020) : 2084-2088 .
APA Zhan, Cheng , Tang, Cheng-Long , Tong, Shang-Qing , Liu, Chuan-Sheng , Huang, Zuo-Hua . Experimental Investigation of Evaporating Spray Macroscopic Characteristics for Gasoline/Diethyl-Ether Blended Fuel . | Journal of Engineering Thermophysics , 2020 , 41 (8) , 2084-2088 .
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The spray vaporization characteristics of gasoline/diethyl ether blends at sub-and super-critical conditions EI SCIE Scopus
期刊论文 | 2020 , 164 | APPLIED THERMAL ENGINEERING | IF: 5.295
SCOPUS Cited Count: 1
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Abstract :

The multi-hole spray vaporization characteristics of gasoline, diethyl ether (DEE) and their blends were investigated at two pressures and elevated temperatures by using high speed schlieren photography and laser sheet patternation. Results show that the effects of DEE addition on spray behaviors depend on the ambient conditions that may lead to sub- and supercritical vapor generation mechanisms: (a) for 0.5 MPa ambient pressure at subcritical state, spray plumes from different nozzle holes are separated. DEE addition results in higher vapor tip penetration, higher spray angle and decreased liquid cross-sectional area, indicating that DEE addition enhances vaporization. However, this effect becomes weaker at higher temperature due to accelerated gasoline vaporization. (b) for 3.8 MPa ambient pressure, spray plumes coalesce as a single plume-like structure due to stronger aerodynamic resistance to the axial penetration of each plume. In addition, opposite from the 0.5 MPa ambient pressure case, DEE addition results in an inhibited vaporization because the fuel blends are more easily heated to supercritical state with the addition of DEE. The thickened interface and reduced mean free path at supercritical state lead to restricted vapor phase generation. This phenomenon is also evidenced by the absence of large liquid blob on the patternation images.

Keyword :

Supercritical spray Diethyl ether GCI Gasoline Vaporization

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GB/T 7714 Zhan, Cheng , Tong, Shangqing , Tang, Chenglong et al. The spray vaporization characteristics of gasoline/diethyl ether blends at sub-and super-critical conditions [J]. | APPLIED THERMAL ENGINEERING , 2020 , 164 .
MLA Zhan, Cheng et al. "The spray vaporization characteristics of gasoline/diethyl ether blends at sub-and super-critical conditions" . | APPLIED THERMAL ENGINEERING 164 (2020) .
APA Zhan, Cheng , Tong, Shangqing , Tang, Chenglong , Huang, Zuohua . The spray vaporization characteristics of gasoline/diethyl ether blends at sub-and super-critical conditions . | APPLIED THERMAL ENGINEERING , 2020 , 164 .
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Experimental and numerical study on impinging fuel spray under high-pressure cross-flow condition EI
会议论文 | 2020 | 14th International Conference on Liquid Atomization and Spray Systems, ICLASS 2018
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It is certified that the fuel spray is strongly affected by both in-cylinder air flow and piston cavity wall impingement in a direct injection engine. In this study, sprays injected by a valve covered orifice nozzle were tested by a high-speed video camera and a continuous wave laser sheet under a wind-tunnel with cross-flow and pressurized ambience, thereby the spray profiles in vertical and horizontal planes were investigated. Moreover, the experiment results were compared with simulations which was calculated by the validated spray models based on the CONVERGE software. With increase in the cross-flow velocity, the spray tip penetration evidently increased, and the increased cross-flow velocity led to an increase in the vortex height because of the enhanced spray dispersion. Furthermore, the high ambient pressure restrains the spray dispersion and leads to smaller spray tip penetration and vortex height. The outlines of spray with same liquid-to-air momentum flux ratio q can agree with each other in the windward side, nevertheless the droplet diffusion under high cross-flow velocity is distinct in the leeside. At the horizontal plane of y=25mm, a complex vortex movement was observed that resulted in a nonuniform distribution of droplets in the upper part of the spray in the leeward side. From the calculations, in the radial region apart from the impingement point (8mm4mm) hardly moved. © 2018 Solar Turbines Incorporated.

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GB/T 7714 Si, Z , Guo, M , Ashida, Y et al. Experimental and numerical study on impinging fuel spray under high-pressure cross-flow condition [C] . 2020 .
MLA Si, Z et al. "Experimental and numerical study on impinging fuel spray under high-pressure cross-flow condition" . (2020) .
APA Si, Z , Guo, M , Ashida, Y , Nishida, K , Ogata, Y , Tang, C et al. Experimental and numerical study on impinging fuel spray under high-pressure cross-flow condition . (2020) .
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Ignition delay time measurement and kinetic modeling of furan, and comparative studies of 2,3-dihydrofuran and tetrahydrofuran at low to intermediate temperatures by using a rapid compression machine EI SCIE Scopus
期刊论文 | 2020 , 213 , 226-236 | COMBUSTION AND FLAME | IF: 4.185
WoS CC Cited Count: 8 SCOPUS Cited Count: 9
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Abstract :

The low to intermediate temperature (850-1050 K) auto-ignition characteristics of furan, 2,3-dihydrofurn and tetrahydrofuran have been investigated both experimentally and kinetically. The pressure (18 and 33 bar) and equivalence ratio (0.5, 1.0 and 2.0) effects on the auto-ignition of furan were experimentally examined using a rapid compression machine. Compared with alkylated furans, the ignition delay times of furan show notably insensitivity to equivalence ratio. Comparison on the low to intermediate temperature reactivity of furan, alkylated furans, 2, 3-dihydrofuran, and tetrahydrofuran indicates that saturation degree plays a more dominant role in enhancing reactivity than alkyl substitution. Literature mechanisms were validated against present data. Kinetic analyses revealed the major fuel consuming routes and the causes for the deviation between simulation and experimental results. Furthermore, a modified model of furan, 2, 3-dihydrofuran, and tetrahydrofuran was proposed and validated against the ignition delay times in this study as well as experimental data in literatures. (C) 2019 Published by Elsevier Inc. on behalf of The Combustion Institute.

Keyword :

Tetrahydrofuran Ignition delay time Rapid compression machine (RCM) Furan 2,3-dihydrofuran

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GB/T 7714 Wu, Yingtao , Xu, Nan , Yang, Meng et al. Ignition delay time measurement and kinetic modeling of furan, and comparative studies of 2,3-dihydrofuran and tetrahydrofuran at low to intermediate temperatures by using a rapid compression machine [J]. | COMBUSTION AND FLAME , 2020 , 213 : 226-236 .
MLA Wu, Yingtao et al. "Ignition delay time measurement and kinetic modeling of furan, and comparative studies of 2,3-dihydrofuran and tetrahydrofuran at low to intermediate temperatures by using a rapid compression machine" . | COMBUSTION AND FLAME 213 (2020) : 226-236 .
APA Wu, Yingtao , Xu, Nan , Yang, Meng , Liu, Yang , Tang, Chenglong , Huang, Zuohua . Ignition delay time measurement and kinetic modeling of furan, and comparative studies of 2,3-dihydrofuran and tetrahydrofuran at low to intermediate temperatures by using a rapid compression machine . | COMBUSTION AND FLAME , 2020 , 213 , 226-236 .
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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: 1 SCOPUS Cited Count: 1
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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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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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