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14th International Conference on Liquid Atomization and Spray Systems, ICLASS 2018

作者： Si, Z. Guo, M. Ashida, Y. Nishida, K. Ogata, Y. Tang, C. Huang, Z. Department of Mechanical System Engineering University of Hiroshima 1-4-1 Kagamiyama Higashi-Hiroshima739-8527 Japan School of Mechanical and Electronic Engineering Wuhan University of Technology 122 Luoshi road Wuhan Hubei430070 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University 28 Xianning west road Xi'an710049 China

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.

关键词： Continuous wave lasers

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Modulating conductivity type of cuprous oxide（Cu2O） films on copper foil in aqueous solution by comproportionation

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Journal of Materials Science & Technology 2019年第8期35卷 1570-1577页

作者： Changwei Tang Xiaohui Ning Jian Li Hui-Lin Guo Ying Yang Shaanxi Provincial Key Laboratory of Electroanalytical Chemistry Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of the Ministry of EducationCollege of Chemistry & Materials ScienceNorthwest UniversityXi'an 710127 China National Demonstration Center for Experimental Chemistry Education Northwest UniversityXi'an 710127 China International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi'an Jiaotong UniversityXi'an 710049 China

Cuprous oxide(Cu2O)is an attractive material for photoelectrochemical(PEC)hydrogen production or photovoltaic application,because of its appropriate band gap,low material cost and *** this paper,Cu2O films were obtained by comproportionation in acid cupric sulfate solutions with varying concentrations of potassium *** and electrochemical experiments,such as zero-bias photocurrent responses,voltammograms,and Mott-Schottky measurements,show that the Cu2O films grown in low(≤0.75 mol dm^–3)and high(≥1.00 mol dm^–3)nitrate ion concentrations presented n-type and p-type conductivity,*** circuit potential and polarization behavior were monitored to investigate the mechanism of modulating conductivity *** ions consume protons in the plating solution during comproportionation with different concentrations of nitrate ions creating different pH at the Cu2O/solution *** gradient leads to the transformation of Cu2Ofilms conductivity changing from n-type to p-type with increasing the concentration of nitrate ions in the plating *** method could be used to fabricate homojunction electrode on metal substrate for PEC hydrogen production or photoelectric application.

关键词： Cuprous oxide(Cu2O) Comproportionation Semiconductor films Tuning conductivity Photoelectrochemical cell

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The role of rotary liquid-solid two-phase flow in the synergistic behavior between sand erosion and electrochemical corrosion of Ni 2 FeCrMo 0.2 alloy in marine environment

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Process Safety and Environmental Protection 2025年 200卷

作者： Xingqi Luo Qipeng Xu Kai Wang Jianjun Feng Yanhui Li Yan Liu Xiya Zhang State Key Laboratory of Water Engineering Ecology and Environment in Arid Area Xi’an University of Technology No.5 Jinhua South Road Xi’an 710048 China State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong University No.28 Xianning West Road Xi’an 710049 China Qinghai Salt Lake Industry Co. Ltd. No.28 Huanghe Road Golmud 816000 China

The erosion-corrosion behavior poses a significant threat to marine equipment, driven by complex multi-physics processes such as sand movement, surface erosion, electrochemical reactions, and corrosive ion transport. Aiming at the widely used rotating liquid-solid two-phase flow system in a marine environment, this study investigates the role of flow velocity in the erosion-corrosion behavior of Ni 2 FeCrMo 0.2 alloy. The coupling analysis of multi-component weight loss, electrochemical kinetics, and microstructure characterization clarifies the interactions between fluid flow, sand migration, ion transfer, and damage morphology, revealing the synergistic erosion-corrosion mechanism. The results show that the erosion-corrosion mechanism transfers with flow velocity. At low velocities, the erosion effect on the harder metal matrix is weak due to insufficient kinetic energy of the sand particles. However, the sand-surface impingement on the softer corrosion products and the mass transfer of corrosive ions lead to erosion-enhanced corrosion, which dominates the material damage process. In contrast, at higher velocities, the impact kinetic energy and frequency of sand particles rise, causing the erosion rate to increase exponentially, which surpasses corrosion, making erosion as the dominant damage mechanism at high velocities. These results highlight the critical role of flow velocity in controlling the erosion-corrosion synergy behavior.

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Anti-K salt poisoning of MnO x catalyst via X (X = Ce, Sm and Er) oxides for low-temperature NH 3 -SCR of NO and oxidating CO

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Journal of Environmental Chemical engineering 2025年第3期13卷

作者： Liang Wang Shan Ren Xiaodi Li Chi He Chunli Zheng Xinzhe Li Shouning Chai Kejiang Li Chunbao Charles Xu College of Materials Science and Engineering Chongqing University Chongqing 400044 PR China State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi’an Jiaotong University Xi’an Shaanxi 710049 PR China School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 PR China School of Energy and Environment City University of Hong Kong Kowloon Hong Kong

Manganese oxide (MnO x ) serves as an effective catalyst for the simultaneous elimination of NO and CO pollutants in low-temperature flue gas. However, potassium salts present in industrial flue gas severely compromise the catalytic performance by altering surface physicochemical properties, leading to deactivation and reduced pollutant removal efficiency. To address this limitation, several rare earth (Ce, Sm and Er) oxides were incorporated into MnO x catalyst to enhance active site under potassium (K) exposure in this work. Catalytic activities of NO and CO removal both followed the order of K-Sm/MA > K-Er/MA > K-Ce/MA > K/MA. Especially, Sm/MA enhanced the considerable conversion of NO and CO at 175°C. Characterization revealed that Sm optimized the ration of Mn 4 + and O α , which showed higher active sites than other rare earth oxides modification. Moreover, in situ DRIFTS analysis confirmed the enhanced fast SCR process and the stronger interaction between CO and active sites on K-Sm/MA catalyst, which contributed to its superior K resistance and improved the removal efficiency. The K-Sm/MA catalyst accumulated more nitrate species and exhibited good reactivity, sustaining continuous NO conversion through the Langmuir-Hinshelwood (L-H) mechanism. Finally, a pathway model of Sm oxide on MnO x catalyst for the simultaneous NH 3 -SCR coupling CO oxidation at K poisoned situation.

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Investigation of curvature statistics of turbulent premixed Bunsen flames based on leading points concept 12

Investigation of curvature statistics of turbulent premixed ...

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12th Asia-Pacific Conference on Combustion, ASPACC 2019

作者： Zhang, Weijie Wang, Jinhua Xia, Hao Lin, Wenjun Zhang, Meng Huang, Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University No. 28 Xian Ning Road Beilin District Xi'an Shaanxi710049 China

In previous studies, it was showed that the leading point, namely, the positively curved flame front, may be vital in controlling the propagation of flame, thus controlling the burning intensity of turbulent premixed flames. This paper is aimed at investigating the morphologies of the leading points under low and relatively high turbulence intensities based on flame curvature statistics. Premixed C3H8/H2/air flames were obtained with a Bunsen burner. Flame front was captured with OH-PLIF technique. The results show prevalent leading points with positive curvatures at low turbulence intensity. Percentage of positive curvatures were observed to increase at lower turbulence intensity. However, with increasing turbulence intensity, such feature can be mitigated or even overpowered with equal probability of negative and positive curvatures. Proper models for leading point are recommended according to the experimental results. However, question remains as to the underlying mechanism of leading point concept. © Asia-Pacific Conference on Combustion, ASPACC *** right reserved.

关键词： Combustion

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Removal and recovery of SO2and NO in oxy-fuel combustion flue gas by calcium-based slurry 5

Removal and recovery of SO2and NO in oxy-fuel combustion flu...

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2020 5th International Conference on Advances in Energy and Environment Research, ICAEER 2020

作者： Cai, Yuyang Ding, Xiaohan Li, Wei Liu, Dunyu Chen, Jun Ni, Mingguo Xu, Kailong Jin, Jing School of Energy and Power Engineering University of Shanghai for Science and Technology Shanghai200093 China Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering University of Shanghai for Science and Technology Shanghai200093 China Department of Computer Science George Mason University Commonwealth of Virginia United States Dongfang Turbine Co. Ltd Deyang618000 China

This study investigates the use of calcium-based slurry for simultaneous removal NO and SO2 from oxy-fuel combustion flue gas, and recovery of the sulfur and nitrogen species in resulting solutions. The experiments were performed in a bubbling reactor in a transient mode under the pressure of 20 bar. The various influencing factors including the CaO amount, carrier gas (N2/CO2), and absorption time on the simultaneous NO and SO2 removal process, and the solution products were studied comprehensively. The results show that the NO2 removal efficiency can be improved by the presence of CO2, and the gas phase HNO2 produces in this process. The addition of CaO has positive effects not only on the NO2 removal efficiency but also on the formation of stable HNO3. With the presence of CO2, CaCO3 is formed in a solution initially. With the decrease of pH, CaCO3 is gradually converted to CaSO4, and in particular CaCO3 can be fully avoided through decreasing the pH of an absorption solution to 1.14. At the same time, the formation of unstable S(IV) and NO2- can be prevented when the solution pH is lower than 1.37. The nitrogen and sulfur compounds in the absorption solution (at pH 1.14) were further separated by the addition of different amounts of CaO. In particular, 95% of SO42- finally can be recovered in the form of CaSO4.2H2O with nitrogen in solution existing as NO3- by controlling the Ca/S ratio at 4.70. The effectiveness of calcium-based slurry on the removal and recovery of SO2 and NO is confirmed. © The Authors, published by EDP Sciences, 2020.

关键词： Sulfur compounds

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Experimental Study on the Characteristics of Effervescent Atomization

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Kung Cheng Je Wu Li Hsueh Pao/Journal of engineering Thermophysics 2019年第4期40卷 834-838页

作者： Wang, Wen-Jie Zheng, Xue-Bo Bai, Bo-Feng State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an710049 China

In this paper, the characteristics of effervescent atomization are studied experimentally. A high speed camera was used to record the bubbling process and the change of the flow regime in the mixing chamber. Three typical flow regimes were observed, namely, bubble flow, transition flow and annular flow. The particle size of the spray droplet was measured by a laser particle sizer. The droplet diameter distribution curve under typical flow regimes was obtained. Bubble flow and annular flow showed a single peak distribution, while transition flow showed a bimodal distribution. The effects of parameters such as gas-liquid ratio (GLR), liquid mass flow rate and orifice diameter on droplet size were studied. The results showed that the larger the GLR, the larger the liquid mass flow rate and the smaller the orifice diameter, the smaller the SMD. The instability of the atomization process is analyzed. The larger the GLR and the smaller the orifice diameter, the greater the instability. © 2019, Science Press. All right reserved.

关键词： Atomization

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Effect of particle size on the thermal performance of NaNO3/SiC)2/C composite phase-change materials

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Particuology 2019年第3期17卷 169-175页

作者： Liang Liu Liqiong Wang Weichun Ge Yanfeng Ge Yun Huang State Key Laboratory of Explosion Science and Technology Beijing Institute of Technology Beijing 100081 China State Key Laboratory of Multiphase Complex Systems Institute of Process Engineering Chinese Academy of Sciences Beijing 100190 China State Grid Liaoning Electric Power Supply Co. Ltd. Shenyang 110004 China

Storage of thermal energy is a key technology for energy conservation and application of renewable energy sources. In this paper, the thermal performance of inorganic composite phase-change materials (PCMs;NaNO3/SiO2/C) is studied under extreme thermal conditions and the effect of raw particle size is examined. We designed a thermal shock test platform with a diffusive combustion system and in-situ infrared thermal imaging. The influences of the heat flux magnitude and exposure time on the performance of the PCMs were examined under vertical thermal shock conditions. Leakage of molten salt in the composite PCMs was observed as the heat flux reached a threshold point. The morphology and thermal properties were characterized by ex-situ SEM, XRD, DSC, and BET. Raw particles with sizes in the range of 105-500 μm were used to synthesize the composite material and examine its role in thermal shock behavior. Our experiments showed that deterioration of the thermal storage density was slowed as the particle size was increased. This work provides useful guidance for improving the anti-thermal shock ability of future material designs.

关键词： Thermal storage Phase change material Particle size Thermal shock Decomposition temperature

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Investigation on turbulent characterization of arrayed micro-tube premixed hydrogen flames using an enhanced flamelet library

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Applied Thermal engineering 2025年 275卷

作者： Han, Xiao Yin, Yanxu Wang, Bosen Chang, Yunxin Cai, Xiao Research Institute of Aero-Engine Beihang University Beijing100191 China National Key Laboratory of Science and Technology on Aero-Engine Aero-thermodynamics Beihang University Beijing100191 China Collaborative Innovation Center for Advanced Aero-Engine Beihang University Beijing100191 China Xi'an Jiaotong University State Key Laboratory of Multiphase Flow in Power Engineering Xi'an710049 China

Lean turbulent premixed hydrogen/air flames exhibit increased flame wrinkling and significantly enhanced flame speeds, posing challenges for stable combustion. In the novel arrayed multi-flame burner, flame instabilities are intensified by flame-flame interactions. This study develops a distributed and efficient numerical framework for the Large Eddy Simulation-Flamelet Generated Manifold (LES-FGM) method, incorporating an improved 1D flamelet library. The framework is applied to investigate flame dynamics in both bluff-body and conical flame systems under varying equivalence ratios (= 0.4–0.7) and Karlovitz numbers (Ka = 1–100). By accounting for preferential diffusion, thermal-diffusive instability, and heat loss in stretched flames, the framework improves the accuracy of the flamelet library and captures key physical effects. 1D simulations are performed to validate and analyze the influence of differential diffusion on flame characteristics. The impact of transient flame stretching is analyzed in detail, revealing its critical role in stability transitions across varying turbulence intensities. Additionally, this study examines turbulence effects and micromix multi-flame interactions. The flame stretch factor varies from 1.1 to 2.4 in these three cases. At lower equivalence ratios, higher Ka suppresses tip-opening but intensifies small-scale flame wrinkling. Flame pocket detachment becomes more frequent. Vortex interactions play a key role in flame instability. The strain rate of conical flames is 40 % lower than that of bluff-body flames. These findings provide novel insights into flame dynamics in multi-flame burner arrays, which are critical for optimizing combustion performance in gas turbine combustors. © 2025 Elsevier Ltd

关键词： Large eddy simulation

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Failure Analysis of Tube-Burst on T91 Platen Superheater of 600 MW Supercritical Boiler

Failure Analysis of Tube-Burst on T91 Platen Superheater of ...

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Artificial Intelligence and Electromechanical Automation (AIEA), International Conference on

作者： Ke Sun Jia'an Wang Yu Yan Jiahao Jiang Lei Deng State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi'an Jiaotong University Xi'an China China Huadian Electric Power Research Institute Co. Ltd. Hangzhou China

ISBN: (数字)9781728182889

ISBN: (纸本)9781728182896

In this paper, the specimen of the bursting tubes, original tube and oxide-like debris are analysed in-depth by macroscopic examination, chemical composition analysis, mechanical properties, metallographic examination, scanning electron microscopy and energy spectrum analysis etc.,. It shows that the main reason for the tube-burst is that the original oxide matters or time-original oxide matters blocks the tube, reducing the cooling effect of the steam, and resulting in a short-term overheating of the tube. It is recommended to control the internal cleanliness of boiler equipment and pipest.

关键词： component tube burst failure analysis oxide matters over temperature FAILURE ANALYSIS excess temperature platen superheater Energy Dispersive X-Ray Spectroscopy oxides Cooling effects tube reducing

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