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学者姓名:汤成龙

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Numerical Study toward Fast Intermediate Species Sampling with High Accuracy in a Rapid Compression Machine EI Scopus SCIE
期刊论文 | 2022 , 36 (23) , 14361-14370 | Energy and Fuels
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Abstract :

Rapid compression machines (RCMs), as prominent zero-dimensional homogeneous reactors, have been widely applied in autoignition chemistry investigations. However, species sampling in these reactors is challenged by quantitative accuracy and the limited time allowed for transient sampling. In this study, the uncertainty of quantitative species sampling during the autoignition of a typical fuel/oxidizer mixture was numerically evaluated. Results show that the sampled species profiles tend to lag behind the "true" values due to the dilution of gases outside of the "core" region. When sampling at a longer ignition delay time, increasing the sample duration over 2 ms has very limited improvement on the sampling accuracy, and adopting a 10 mm probe tube is long enough to minimize the errors caused by dilution. In the reaction chamber where nonideal gas disturbance occurs, the sampled gases can be seriously diluted, leading to large deviations in the results. Concentration uncertainties vary among species, while uncertainties in the normalized time are consistent, which can be limited to 6% with proper piston design and sampling setups. © 2022 American Chemical Society. All rights reserved.

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GB/T 7714 Wu, Y. , Kong, X. , Fei, L. et al. Numerical Study toward Fast Intermediate Species Sampling with High Accuracy in a Rapid Compression Machine [J]. | Energy and Fuels , 2022 , 36 (23) : 14361-14370 .
MLA Wu, Y. et al. "Numerical Study toward Fast Intermediate Species Sampling with High Accuracy in a Rapid Compression Machine" . | Energy and Fuels 36 . 23 (2022) : 14361-14370 .
APA Wu, Y. , Kong, X. , Fei, L. , Mai, Z. , Liu, J. , Tang, C. et al. Numerical Study toward Fast Intermediate Species Sampling with High Accuracy in a Rapid Compression Machine . | Energy and Fuels , 2022 , 36 (23) , 14361-14370 .
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Experimental Investigation on Auto-Ignition Characteristics of Kerosene Spray Flames Scopus SCIE
期刊论文 | 2022 , 10 (8) | Machines
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Abstract :

To facilitate the better use of RP-3 kerosene in compression ignition engines, the auto-ignition behaviors of RP-3 kerosene spray were experimentally investigated in an optical rapid compression machine. Results show that most of the tests have good ignitability and combustion performance. For all the successful ignited cases, the flame kernel was found to be formed before the steep rise of pressure, which explained that image-based ignition delay time is always shorter than the pressure-based ignition delay time. The effects of ambient environment, injection pressure, and injection delay time on the pressure history, ignition intensity, combustion duration, heat release rate, and other parameters were investigated individually. The ambient environment has a strong influence on ignition delay time by accelerating the chemical reactions, whereas the high injection pressure helps the better vaporization of fuel spray. The effect of injection delay time is non-monotonic as the trade-off relation between heat loss and blending of fuel and oxygen. The heat release rate histories under different conditions were compared and analyzed, and the two-stage heat release phenomenon was observed in the negative temperature coefficient region. The ignition intensity region was determined based on the measured ignition delay times of RP-3 kerosene spray, and multiple linear regression correlation was used to study the ignition delay time sensitivity to multi-factors. © 2022 by the authors.

Keyword :

ignition delay time; rapid compression machine; RP-3 kerosene; spray combustion

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GB/T 7714 Mai, Z. , Liu, Y. , Tang, C. et al. Experimental Investigation on Auto-Ignition Characteristics of Kerosene Spray Flames [J]. | Machines , 2022 , 10 (8) .
MLA Mai, Z. et al. "Experimental Investigation on Auto-Ignition Characteristics of Kerosene Spray Flames" . | Machines 10 . 8 (2022) .
APA Mai, Z. , Liu, Y. , Tang, C. , Huang, Z. . Experimental Investigation on Auto-Ignition Characteristics of Kerosene Spray Flames . | Machines , 2022 , 10 (8) .
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The liquid film behaviors created by an inclined jet impinging on a vertical wall EI SCIE Scopus
期刊论文 | 2022 , 34 (11) | PHYSICS OF FLUIDS
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Liquid films created by inclined jet-wall impingement are commonly seen in industrial applications. We investigated the liquid film behaviors created by an inclined jet impinging on a vertical glass wall using a brightness-based laser-induced fluorescence method. It was found that the typical liquid film by an inclined jet-wall impingement consists of the thin layer zone, the raised zone, the liquid node, and the trailing edge. The liquid film expands with higher impingement velocity but keeps the same elliptical shape. A normalized linear correlation is proposed to estimate the liquid film thickness. Based on the continuity equation and the empirical convection model, the Reynolds number distribution is deduced from the film thickness distribution. The Reynolds number in the thin layer zone is less than the critical Reynolds number. The surface waves in the thin layer zone are divided into the ripple waves and the disturbance waves. The disturbance waves have a larger wavelength and amplitude than the ripple waves. The quantitative measurement of the disturbance waves shows that the wavelength and amplitude increase linearly along the radial distance. The smaller impingement velocity does not change the growth rate of the wavelength but accelerates the development of the amplitude. Published under an exclusive license by AIP Publishing.

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GB/T 7714 Liu, Chuansheng , Yu, Jun , Tang, Chenglong et al. The liquid film behaviors created by an inclined jet impinging on a vertical wall [J]. | PHYSICS OF FLUIDS , 2022 , 34 (11) .
MLA Liu, Chuansheng et al. "The liquid film behaviors created by an inclined jet impinging on a vertical wall" . | PHYSICS OF FLUIDS 34 . 11 (2022) .
APA Liu, Chuansheng , Yu, Jun , Tang, Chenglong , Zhang, Peng , Huang, Zuohua . The liquid film behaviors created by an inclined jet impinging on a vertical wall . | PHYSICS OF FLUIDS , 2022 , 34 (11) .
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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 :

Dissociation Isomerization Isomers Plants (botany) Potential energy 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 and Thermal Safety of the Composite Modified Double Base Propellants under Rapid Heating EI SCIE Scopus
期刊论文 | 2021 , 47 (1) | PROPELLANTS EXPLOSIVES PYROTECHNICS
SCOPUS Cited Count: 1
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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 Ignition Delay Time Rapid Compression Machine Thermal Safety

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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 , 47 (1) .
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 47 . 1 (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 , 47 (1) .
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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 :

Drop Test Hypergolic ignition Ionic liquids Nitroglycerin

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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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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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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 :

Ethers Evaporation Gasoline Temperature

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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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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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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: 7
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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 :

Diethyl ether Gasoline GCI Supercritical spray 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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