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Direct observations of reaction zone structure in shock-induced ignition of methane air mixture

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Chinese Science Bulletin 2009年第13期54卷 2247-2255页

作者： WANG GaoFeng MA ChengBiao WANG BaoYuan lin qizhao Department of Thermal Science and Energy Engineering University of Science and Technology of China Hefei 230027 China

Ignition of methane/air mixture by the passage of a shock wave is an important issue for understanding more details ofits gaseous *** experiments of shock-induced ignition of stoichiometric methane/air mixture were conducted on a shock tube *** reaction zone structure in weak and strong ignition cases were investigated by digital chemiluminescence imaging and planar laser induced fluorescence(PLIF) *** to smaller gradients in induced time in weak ignition,which provided more time to nonlinear chemical reaction process,the results show that the reaction structures are highly nonuniform in those weak ignition cases,which become more regular while induced shock waves become *** strong ignition case,it gives a typical detonation *** characteristics of reaction zone released by single-pulsed OH PLIF technique agreed well with other experimental measurements in this paper and were also in accord with the conclusions of previous *** successful implementation of the PLIF system has explored a new high temporally and spatially resolved method for the study ofinteraction between shock wave and gaseous matter in shock tube.

关键词：反应区结构空气混合物平面激光诱导荧光点火甲烷化学反应过程诱导时间气相爆轰

New mass loss kinetic model for thermal decomposition of biomass

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Chinese Science Bulletin 2001年第16期46卷 1398-1402页

作者： LIU Naian FAN Weicheng R.Dobashi lin qizhao State Key Laboratory of Fire Science University of Science and Technology of ChinaHefei 230026China Department of Chemical System Engineering School of Engineeringthe University of Tokyo7-3-1 HongoBunkyo-kuTokyo113Japan

Based on non-isothermal experimental results for eight Chinese biomass species, a new kinetic model, named as the 損seudo bi-component separate-stage model (PBSM)? is developed in this note to describe the mass loss behavior of biomass thermal decomposition. This model gains an advantage over the commonly used 損seudo single-component overall model (PSOM)?and 損seudo multi-component overall model (PMOM)? By means of integral analysis it is indicated that the new model is suitable to describe the mass loss kinetics of wood and leaf samples under relatively low heating rates (e.g. 10℃/min, used in this work).

关键词： biomass mass loss kinetics thermal decomposition.

Experimental Investigation on Macro Spray Characteristics of Octanol-Biodiesel-Diesel Ternary Fuel Blend

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China Petroleum Processing & Petrochemical Technology 2023年第4期25卷 1-15页

作者： Tian Junjian Qiu Zhicong Zhao Lifei Li Fengyu Hu Peng lin qizhao Department of Thermal Science and Energy Engineering University of Science and Technology of ChinaHefei 230027China State Key Laboratory of Compressor Technology Hefei General Machinery Research Institute Co.Ltd.Hefei 230031China

This study investigates the spray characteristics of ternary blends composed of octanol, biodiesel, and diesel *** are conducted using six materials to examine the variation in spray characteristic and to verify and compare a previously established spray tip penetration model with a modified model. The results show that the addition of OB100(30%of octanol, 70% of biodiesel) improves the spray characteristics of the fuel. Specifically, the addition of 10% or 20% of OB100 leads to a slight increase in the spray tip penetration, average spray cone angle, maximum spray width, and the spray area of the fuel blend;however, further addition of OB100 causes a corresponding decrease in these parameters. Based on previous research, this study uses kinematic viscosity instead of dynamic viscosity and density to modify the prediction model of spray tip penetration. The modified model exhibits a better fit quality and agreement with the experimental data,making it more suitable for predicting the spray tip penetration of fuel blends compared to the Hiroyasu-Arai model.

关键词： octanol biodiesel ternary fuel blend maximum spray width modified model

Effects of Blending Long-Chain Alcohols with Jet Fuel on the Macroscopic Spray Characteristics

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China Petroleum Processing & Petrochemical Technology 2019年第4期21卷 49-57页

作者： Li Fengyu Liu Yanju Huang Qifu Fu Wei Shi Weidong lin qizhao Department of Thermal Science and Energy Engineering University of Science and Technology of ChinaHefei 230026 Beijing Mechanical Equipment Institute Beijing100854

Long-chain alcohols were considered to be promising alternative fuels and fuel additives. This study was aimed at figuring out the influences of blending long-chain alcohols with jet fuel on the macroscopic spray characteristic. n-Butanol and n-pentanol were chosen as tested alternative fuels. A common-rail injection system was used to create high-pressure injection conditions. The Schlieren imaging system was used to capture spray processes. Results showed that with the addition of long-chain alcohols, the spray tip penetration and the peak spray tip velocity increased, whereas the spray cone angle and the spray area decreased. Comparisons between those macroscopic spray characteristics of AKB blends and AKP blends were also conducted. Compared to AKB blends, AKP blends showed similar spray tip penetration, larger peak tip velocity, smaller spray cone angle, and smaller spray area.

关键词： macroscopic spray characteristics jet fuel n-butanol n-pentanol common-rail system

利用OH发射谱进行的高温低浓度甲烷着火研究

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国防科技大学学报 2017年第6期39卷 197-202页

作者：马承飚林其钊中国科学技术大学工程科学学院安徽合肥230027

采用激波管进行低浓度甲烷和空气混合气的着火实验,通过测量压力和OH发射光谱,得到不同工况下的着火延迟,并与甲烷的详细反应机理计算结果作比较。结果表明:不同浓度下甲烷着火延迟的对数与温度倒数呈线性关系,着火延迟随甲烷浓度的降... 详细信息

采用激波管进行低浓度甲烷和空气混合气的着火实验,通过测量压力和OH发射光谱,得到不同工况下的着火延迟,并与甲烷的详细反应机理计算结果作比较。结果表明:不同浓度下甲烷着火延迟的对数与温度倒数呈线性关系,着火延迟随甲烷浓度的降低而减少;贫燃条件下,采用详细动力学机理计算的表观活化能与实验数据拟合较好。

关键词：低浓度甲烷着火延迟激波管 OH发射谱

利用敏感性分析方法简化的贫燃甲烷氧化反应机理

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国防科技大学学报 2017年第2期39卷 164-170页

作者：马承飚林其钊中国科学技术大学工程科学学院安徽合肥230027

以grimech 3.0详细反应动力学机理为基础,计算贫燃甲烷氧化时各个基元反应对关键中间组分的生产与消耗的贡献,并利用敏感性分析的方法研究甲烷氧化过程中各基元反应对整体反应速率的贡献程度。在确定主反应路径的前提下,构建包含16种组... 详细信息

以grimech 3.0详细反应动力学机理为基础,计算贫燃甲烷氧化时各个基元反应对关键中间组分的生产与消耗的贡献,并利用敏感性分析的方法研究甲烷氧化过程中各基元反应对整体反应速率的贡献程度。在确定主反应路径的前提下,构建包含16种组分、31步反应的甲烷氧化的简化反应动力学机理,并与详细机理做比较。该简化机理主要适用于当量比在0.2以下的极端贫燃工况。

关键词：简化机理敏感性分析 gmnech3.0

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玉米秆热解的最概然机理

化工学报 2012年第8期63卷 2599-2605页

作者：李小民林其钊中国科学技术大学热科学与能源工程系安徽合肥230026

引言我国秸秆原料年产能约为7亿吨,约合3.5亿吨标准煤,包括玉米秆、麦秆和稻草等。秸秆的可再生性、零CO2排放和短生长周期等优势,使其成为生物质利用的重要对象之一。

关键词：玉米秆热解热重反应机理

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计算机图形技术在林火蔓延模拟计算中的应用

计算机辅助设计与图形学学报 2005年第12期17卷 2619-2624页

作者：秦向东路长林其钊中国科学院地理科学与资源研究所资源科学研究中心北京100101 中国科学技术大学火灾科学国家重点实验室合肥230026 中国科学技术大学热科学和能源工程系合肥230026

蔓延模型在过火区图元集和蔓延灰度图的基础上进行位图操作和轮廓搜索,用蔓延填充处理地理要素的复杂拓扑关系,以位图旋转和错切代替过火区形状的投影变换,利用地形灰度图计算太阳辐射,由此克服了原有波动模型计算性能上的局限.对利用... 详细信息

蔓延模型在过火区图元集和蔓延灰度图的基础上进行位图操作和轮廓搜索,用蔓延填充处理地理要素的复杂拓扑关系,以位图旋转和错切代替过火区形状的投影变换,利用地形灰度图计算太阳辐射,由此克服了原有波动模型计算性能上的局限.对利用图形技术提高计算速度的实质作了理论分析.最后用算例证实了文中模型能提供精确、实时、可靠、全局、易维护、高适应性的火场发展图.

关键词：计算机图形技术森林火灾模拟蔓延模型计算性能

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常温空气无焰燃烧中NO_x生成的研究

环境科学学报 2006年第10期26卷 1671-1676页

作者：邢献军林其钊中国科学技术大学热科学与能源工程系合肥230026

研究了常温空气无焰燃烧中NOx的生成规律.实验研究和计算分析表明,在燃烧器射流对称轴上(300mm×2000mm的空间内),自喷口至炉膛中心处,有一个温度较低的剧烈的燃气与空气扩散混合区,在此区域内,不生成NOx;温度大于1320K的区域,开始生成N... 详细信息

研究了常温空气无焰燃烧中NOx的生成规律.实验研究和计算分析表明,在燃烧器射流对称轴上(300mm×2000mm的空间内),自喷口至炉膛中心处,有一个温度较低的剧烈的燃气与空气扩散混合区,在此区域内,不生成NOx;温度大于1320K的区域,开始生成N2O;在炉膛后部温度大于1810K的高温区,开始生成NO.过量空气系数与容积热负荷对烟气中NOx生成量的影响不大.与传统的扩散火焰或预混火焰不同,常温空气无焰燃烧反应发生在一个弥散的宽广区域,在整个炉膛内同时进行,炉膛内高温区面积很小,因而NOx的生成量低,排放稳定.

关键词：常温空气无焰燃烧 NOx生成实验研究