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Frontiers in Energy 2023年第6期17卷 751-762页

作者： Yibo GAO erjiang hu Bo huANG Zuohua huANG State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049China Institute of Chemical Engineering and Technology Xi’an Jiaotong UniversityXi’an 712000China

Dehydrogenation of formic acid (FA) is considered to be an effective solution for efficient storage and transport of hydrogen. For decades, highly effective catalysts for this purpose have been widely investigated, but numerous challenges remain. Herein, the Pd_(x)Au_(1−x) (x = 0, 0.2, 0.4, 0.5, 0.6, 0.8, 1) alloys over the whole composition range were successfully prepared and used to catalyze FA hydrogen production efficiently near room temperature. Small PdAu nanoparticles (5–10 nm) were well-dispersed and supported on the activated carbon to form PdAu solid solution alloys via the eco-friendly slow synthesis methodology. The physicochemical properties of the PdAu alloys were comprehensively studied by utilizing various measurement methods, such as X-ray diffraction (XRD), N2 adsorption–desorption, high angle annular dark field-scanning transmission electron microscope (HAADF-STEM), X-ray photoelectrons spectroscopy (XPS). Notably, owing to the strong metal-support interaction (SMSI) and electron transfer between active metal Au and Pd, the Pd0.5Au0.5 obtained exhibits a turnover frequency (TOF) value of up to 1648 h−1 (313 K, nPd+Au/nFA = 0.01, nHCOOH/nHCOONa = 1:3) with a high activity, selectivity, and reusability in the FA dehydrogenation.

关键词： FA dehydrogenation face-centred cubic structures PdAu solid solution alloy nanoparticles slow synthesis methodology SMSI effect

Laminar Flame Instability of n-Hexane,n-Octane,and n-Decane in Spherical Expanding Flames

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Journal of Thermal Science 2024年第3期33卷 1189-1199页

作者： YIN Geyuan hu erjiang LI Xiaotian LV Xin huANG Zuohua State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an710049China United Automotive Electronic Systems Co. LtdShanghai201206China Chongqing Changan Automobile Co. Ltd.Chongqing401120China

This paper focuses on the laminar flame instability of three high molecular weight n-alkanes,namely n-hexane,n-octane,and *** experiment was carried out in a constant volume combustion bomb to get the flame *** critical radius under different conditions was extracted using the image processing *** with the existing critical Peclet number theory,the dominant factors of flame instability under current conditions for three n-alkanes can be figured ***,the average cell size(equivalent cell radius,R_(cell))was extracted to provide quantitative analysis of the flame cellular structure,based on the method developed in this *** theoretical R_(cell)were also calculated and compared with the experimental results to validate the proposed method.

关键词： cellular instability equivalent cell radius critical Peclet number spherical flame

Effect of 2,5-dimethylfuran addition on ignition delay times of n-heptane at high temperatures

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Frontiers in Energy 2019年第3期13卷 464-473页

作者： Zhenhua GAO erjiang hu Zhaohua XU Geyuan YIN Zuohua huANG State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong UniversityXi'an 710049China

The shock tube autoignition of 2,5-dimethylfuran (DMF)/n-heptane blends (DMF)/n-100%, by mole fraction) with equivalence ratios of 0.5, 1.0, and 2.0 over the temperature range of 1200-1800 K and pressures of 2.0 atm and 10.0 atm were investigated. A detailed blend chemical kinetic model resulting from the merging of validated kinetic models for the components of the fuel blends was developed. The experimental observations indicate that the ignition delay times nonlinearly increase with an increase in the DMF addition level. Chemical kinetic analysis including radical pool analysis and flux analysis were conducted to explain the DMF addition effects. The kinetic analysis shows that at lower DMF blending levels, the two fuels have negligible impacts on the consumption pathways of each *** the DMF addition increases to relatively higher levels, the consumption path of n-heptane is significantly changed due to the competition of small radicals, which primarily leads to the nonlinear increase in the ignition delay times of DMF/n-heptane blends.

关键词： ignition delay time shock tube kinetic model 2,5-dimethylfuran (DMF) n-heptane

Experimental and kinetic study on laminar flame speeds of ammonia/syngas/air at a high temperature and elevated pressure

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Frontiers in Energy 2022年第2期16卷 263-276页

作者： Geyuan YIN Chaojun WANG Meng ZHOU Yajie ZHOU erjiang hu Zuohua huANG State Key Laboratory of Multiphase Flow in Power Engineering Xi’an Jiaotong UniversityXi’an 710049China Key Laboratory for Thermal Science and Power Engineering of the Ministry of Education Department of Thermal EngineeringTsinghua UniversityBeijing 100084China

The laminar flame speeds of ammonia mixed with syngas at a high pressure, temperature, and different syngas ratios were measured. The data obtained were fitted at different pressures, temperatures, syngas ratios, and equivalence ratios. Four kinetic models (the Glarborg model, Shrestha model, Mei model, and Han model) were compared and validated with experimental data. Pathway, sensitivity and radical pool analysis are conducted to find out the deep kinetic insight on ammonia oxidation and NO formation. The pathway analysis shows that H abstraction reactions and NHi combination reactions play important roles in ammonia oxidation. NO formation is closely related to H, OH, the O radical produced, and formation reactions. NO is mainly formed from reaction, HNO+ H= NO+ H2. Furthermore, both ammonia oxidation and NO formation are sensitive to small radical reactions and ammonia related reactions.

关键词： ammonia mixed with syngas laminar flame speed kinetic model sensitivity analysis pathway analysis

Measurement of laminar burning velocities and analysis of flame stabilities for hydrogen-air-diluent premixed mixtures

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Chinese Science Bulletin 2009年第5期54卷 846-857页

作者： hu erjiang huANG Zuohua HE JiaJia JIN Chun MIAO HaiYan WANG XiBin State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong University Xi'an 710049 China

The laminar burning velocities and Markstein lengths of the hydrogen-air-diluent mixtures were meas-ured at different equivalence ratios (0.4―1.5), different diluents (N2, CO2 and 15%CO2+85%N2) and di-lution ratios (0, 0.05, 0.10 and 0.15) by using the outwardly expanding flame. The influences of flame stretch rate on the flame propagation characteristics were analyzed. The results show that both the laminar burning velocities and the Markstein lengths of the hydrogen-air-diluent mixtures decrease with the increase of dilution ratio. The decrease in Markstein lengths means that adding diluents into the hydrogen-air mixtures will decrease the diffusional-thermal instability of the flame front. For a specified dilution ratio, the laminar burning velocities give their maximum values at an equivalence ratio of 1.8. The Markstein lengths increase with the increase of the equivalence ratio monotonously regardless of the diluents. The study shows that CO2 as the diluent has a greater impact on the laminar flame speed and the flame front stability than N2 as the diluent.

关键词：氢气空气混合火焰特性燃烧速度稳定性

Numerical study on combustion of diluted methanol-air premixed mixtures

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Chinese Science Bulletin 2010年第9期55卷 884-891页

作者： Zheng JianJun Zhang ZhiYuan huang Zuohua hu erjiang Tang ChengLong Wang Jinhua Xi An Jiao Tong Univ State Key Lab Multiphase Flow Power Engn Xian 710049 Peoples R China

The effect of nitrogen dilution on the premixed combustion characteristics and flame structure of laminar premixed methanol-air-nitrogen mixtures are analyzed numerically based on an extended methanol oxidation mechanism. The laminar burning velocities, the mass burning fluxes, the adiabatic flame temperature, the global activation temperature, the Zeldovich number, the effective Lewis number and the laminar flame structure of the methanol-air-nitrogen mixtures are obtained under different nitrogen dilution ratios. Comparison between experiments and numerical simulations show that the extended methanol oxidation mechanism can well reproduce the laminar burning velocities for lean and near stoichiometric methanol-air-nitrogen mixtures. The laminar burning velocities and the mass burning fluxes decrease with the increase of nitrogen dilution ratio and the effect is more obvious for the lean mixture. The effective Lewis number of the mixture increases with the increase of nitrogen dilution ratio, and the diffusive-thermal instability of the flame front is decreased by the nitrogen addition. Nitrogen addition can suppress the hydrodynamic instability of methanol-air-nitrogen flames. The decrease of the mole fraction of OH and H is mainly responsible for the suppressed effect of nitrogen diluent on the chemical reaction in the methanol-air-nitrogen laminar premixed flames, and the NOx and formaldehyde emissions are decreased by the nitrogen addition.

关键词： methanol dilution premixed combustion numerical analysis

Progress in hydrogen enriched hydrocarbons combustion and engine applications

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Frontiers in Energy 2014年第1期8卷 73-80页

作者： Zuohua huANG Jinhua WANG erjiang hu Chenglong TANG Yingjia ZHANG State Key Laboratory of Multiphase Flow in Power Engineering Xi'anJiaotong University Xi'an 710049 China

The paper summarized the work on hydrogen enriched hydrocarbons combustion and its application in engines. The progress and understanding on laminar burning velocity, flame instability, flame structure flame and chemical kinetics were presented. Based on funda- mental combustion, both homogeneous spark-ignition engine and direct-injection spark-ignition engine fueled with natural gas-hydrogen blends were conducted and the technical route of natural gas-hydrogen combined with exhaust gas recirculation was proposed which experimen- tally demonstrated benefits on both thermal efficiency improvement and emissions reduction.

关键词： hydrogen enriched hydrocarbon combustion,fundamental study engine application

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汽油层流燃烧速度的测量及其替代物模型研究

西安交通大学学报 2019年第3期53卷 36-42页

作者：徐昭华胡二江黄佐华西安交通大学动力工程多相流国家重点实验室西安710049

针对实际汽油组分复杂导致数值模拟研究困难的问题,采用球形火焰法,在定容燃烧弹上测量了初始温度分别为358、403、448 K,初始压力分别为0.1、0.2、0.5 MPa,当量比为0.8～1.5工况下,实际汽油、正庚烷、异辛烷、甲苯、异辛烷/正庚烷混合... 详细信息

针对实际汽油组分复杂导致数值模拟研究困难的问题,采用球形火焰法,在定容燃烧弹上测量了初始温度分别为358、403、448 K,初始压力分别为0.1、0.2、0.5 MPa,当量比为0.8～1.5工况下,实际汽油、正庚烷、异辛烷、甲苯、异辛烷/正庚烷混合燃料(PRF)、甲苯/异辛烷/正庚烷混合燃料(TRF)的层流燃烧速度,分析了初始温度、压力以及当量比对汽油的层流燃烧速度的影响规律,对比了不同替代物模型对实际汽油的层流燃烧速度的预测结果。基于实验结果,构建了适合我国汽油的双组分和三组分汽油替代物模型,对比结果表明,在本研究的实验工况范围内,三组分汽油替代物模型比双组分汽油替代物模型能够更好预测实际汽油层流燃烧速度。应用Chemkin软件和KAUST清洁燃烧研究中心近期发展的汽油替代物机理,对本研究实验数据进行了数值仿真,该机理对实验数据给出了合理预测。利用本研究提出的汽油替代物模型,可对实际汽油的层流燃烧速度进行合理的预测。

关键词：汽油层流燃烧速度实验测量汽油替代物模型

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氨气掺混二甲醚燃料层流的燃烧特性研究

工程热物理学报 2022年第8期43卷 2249-2255页

作者：肖波殷阁媛胡二江黄佐华西安交通大学动力工程多相流国家重点实验室西安710049

本文研究了氨气掺混二甲醚混合燃料的燃烧特性,在定容燃烧弹中测量了初始压力为0.1 MPa、0.2 MPa、0.5 MPa,初始温度298 K、373 K、423 K,当量比范围为0.7~1.6的氨气掺混二甲醚混合燃料的层流燃烧速度。通过将模型预测值与实验值进行比... 详细信息

本文研究了氨气掺混二甲醚混合燃料的燃烧特性,在定容燃烧弹中测量了初始压力为0.1 MPa、0.2 MPa、0.5 MPa,初始温度298 K、373 K、423 K,当量比范围为0.7~1.6的氨气掺混二甲醚混合燃料的层流燃烧速度。通过将模型预测值与实验值进行比较,发现模型很好地预测了实验结果。反应路径分析的表明,二甲醚燃烧主要先生成甲醛,再通过氧化生成醛基,对于氨,NH_(2),NH是重要的中间产物,H、OH、O自由基对路径影响很大。在不同温度和不同当量比条件下进行敏感性分析,发现对层流燃烧速度影响较大的基元反应。

关键词：氨气二甲醚层流燃烧速度敏感性分析路径分析

RP-3航空煤油模拟替代燃料燃烧特性的实验

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航空动力学报 2019年第12期34卷 2677-2685页

作者：刘靖胡二江黄佐华曾文西安交通大学能源与动力工程学院动力工程多相流国家重点实验室西安710049 沈阳航空航天大学辽宁省航空推进系统先进测试技术重点实验室沈阳110136

在定容弹中实验测试了初始压力分别为0.1、0.3MPa、初始温度分别为390、400、420K、当量比范围为0.8~1.5时RP-3航空煤油模拟替代燃料的层流燃烧特性,并对比分析了模拟替代燃料与RP-3航空煤油的层流燃烧速率。结果表明,模拟替代燃料层流... 详细信息

在定容弹中实验测试了初始压力分别为0.1、0.3MPa、初始温度分别为390、400、420K、当量比范围为0.8~1.5时RP-3航空煤油模拟替代燃料的层流燃烧特性,并对比分析了模拟替代燃料与RP-3航空煤油的层流燃烧速率。结果表明,模拟替代燃料层流燃烧火焰的马克斯坦长度随初始压力或当量比的降低逐渐增大,表明火焰稳定性逐步增强;初始温度对火焰稳定性的影响不明显;随初始温度的升高或初始压力的降低,模拟替代燃料的层流燃烧速率逐渐升高;随着当量比的逐渐增大,模拟替代燃料的层流燃烧速率先增大后降低,在当量比为1.2时达到最大;在相同工况下,模拟替代燃料与RP-3航空煤油的层流燃烧速率吻合较好。

关键词： RP-3航空煤油模拟替代燃料层流燃烧速率马克斯坦长度影响因素