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Experimental Study on Soot Suppression of Acetylene Diffusion Flame by Acoustic-Excited Oscillation in Rijke-Type Burner

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Journal of Thermal Science 2024年第1期33卷 235-248页

作者： ZHU Yibin GUO Hui SUO Yan'ge WU Minle YE Yanghui li guoneng ZHANG Zhiguo School of Mechanical and Energy Engineering Zhejiang University of Science and TechnologyHangzhou 310023China

This work reports that the flame oscillation induced by acoustic excitation can effectively suppress soot generation in Rijke-type *** the acoustic frequency is close to the natural frequency of the burner system,it can produce resonance resulting in intense oscillation of the *** relationship between the soot suppression efficiency and the acoustic field of standing wave at different flame positions is *** with that under self-excited oscillation,when there is external forced acoustic force introduced to the flame,oscillation combustion occurred in a lager zone in the glass *** fundamental cause of different soot suppression efficiency at different positions is that the standing wave acoustic field causes the particles to move at different speeds in different positions of the glass *** axial particle velocity difference results in the formation of acoustic vortexes and the change of the flame *** high particle velocity causes the air in the glass tube to turn into the turbulent condition and make the flame temperature *** results show that the surface growth rate of soot is reduced,while the oxidation rate of soot is enhanced,which result in the soot suppression under acoustic *** study can provide some reference for the practical application of oscillate combustion in soot suppression.

关键词： soot suppression acetylene diffusion flame acoustic-excited oscillation standing wave

高功率便携式生物质燃烧驱动温差发电机的研发

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Engineering 2023年第5期24卷 192-201,I0005页

作者： guoneng li Jie Ying Minbo Yi Youqu Zheng Yuanjun Tang Wenwen Guo Department of Energy and Environment System Engineering Zhejiang University of Science and TechnologyHangzhou 310023China

利用生物质燃烧产生电力是贫困地区解决照明、通讯和医疗等基本需求的重要方式。本文开发和测试了一种高功率便携式生物质燃烧驱动的温差发电机(biomass-combustion-powered thermoelectric generator,BCP-TEG),详细研究了其温差分布、... 详细信息

利用生物质燃烧产生电力是贫困地区解决照明、通讯和医疗等基本需求的重要方式。本文开发和测试了一种高功率便携式生物质燃烧驱动的温差发电机(biomass-combustion-powered thermoelectric generator,BCP-TEG),详细研究了其温差分布、功率负载特性和不同层级的效率,并开展了现场应用测试。研究结果发现该温差发电机在自身重量为7.6 kg的条件下可同时产生750 W的热力和23.4 W的电力,热电联供效率达到32.3%。温差发电机的发电净功率密度为2.41 W·kg^(-1),均高于所有基于闭式循环冷却的文献报道结果。此外,利用本文开发的温差发电机燃烧1 kg的木条所发出的电能可充满1个容量为6.2 A·h的3.7 V锂电池。最后,论文详细讨论了BCP-TEG研究领域存在的问题和未来可研究的方向。

关键词：温差发电机热电联供闭式循环锂电池负载特性应用测试功率密度 BCP

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旋转横流中侧边射流偏斜和扩散的实验研究

中国电机工程学报 2011年第17期31卷 67-71页

作者：李国能林江浙江科技学院轻工学院浙江省杭州市310023

为研究旋转横流中侧边射流的偏斜和扩散特性,搭建了横向射流流动显示实验台架,采用可调同步激光器和CCD摄影技术获得了不同射流速度比率时(r=15、30、45、60、75)横向射流的流场结构,基于横流槽道特征尺寸和射流速度的雷诺数Re介于22 53... 详细信息

为研究旋转横流中侧边射流的偏斜和扩散特性,搭建了横向射流流动显示实验台架,采用可调同步激光器和CCD摄影技术获得了不同射流速度比率时(r=15、30、45、60、75)横向射流的流场结构,基于横流槽道特征尺寸和射流速度的雷诺数Re介于22 537和112 683之间。实验结果表明,旋转横流中侧边射流的射流速度比率较大(r>30)时,射流深度基本不变,异于均匀横流中侧边射流的气流偏斜特性。另外,并非越大的射流速度比率就能获得越大的射流扩展宽度,当r=60时,系统的射流扩展宽度最大,而且在较大的射流深度区域内维持较大的扩展宽度,有利于物质的混合扩散。

关键词：旋转横流侧边射流中心轨迹扩展宽度

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横向射流中心轨迹和扩展宽度

化工学报 2011年第1期62卷 66-70页

作者：李国能林江李凯郑友取浙江科技学院轻化工程系浙江杭州310023

In order to study the penetration depth and the spread width in a transverse jet, a flow-visualization based experimental setup was built.A phase tunable laser and CCD system was employed, and several jet to crossflow velocity ratio (r=2, 4, 8, 12, 16) were *** results showed that the jet to crossflow velocity ratio is the key parameter to control the penetration depth and the blending law of the jet, and that larger jet to crossflow velocity ratio resulted in much deeper penetration *** experimental data agreed well with the previous reports, and predicting formula was derived as the fitting equation y/rd=1.3615(x/rd)0.5608 with the correlation coefficient R=*** the other hand, the larger jet to crossflow velocity ratio is not the greater access to the spread width, and in this work, the case of r=8 obtained the largest spread width, and the spread width remains relatively large in a large penetration zone.

关键词：横向射流中心轨迹扩展宽度流动显示

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高碳与光调控对微藻捕集CO2的影响机制

化工进展 2020年第11期39卷 4600-4607页

作者：李珂李清毅郭文文李国能浙江科技学院能源与环境系统工程系浙江杭州310023 浙江省能源集团有限公司浙江杭州310007

微藻捕集烟气CO2是一种环境友好的、可持续发展的碳减排技术。微藻通过光合作用固定CO2,光是驱动光合作用的原初能量,CO2是支撑光合作用的物质基础,通过调控光源和碳源可以最直接有效地促进CO2的捕集。然而,由于微藻对光谱吸收具有选择... 详细信息

微藻捕集烟气CO2是一种环境友好的、可持续发展的碳减排技术。微藻通过光合作用固定CO2,光是驱动光合作用的原初能量,CO2是支撑光合作用的物质基础,通过调控光源和碳源可以最直接有效地促进CO2的捕集。然而,由于微藻对光谱吸收具有选择性、不同生命阶段对光谱吸收具有差异性,盲目的归一化调控策略将收效甚微。本文简述了几种可以提高微藻固碳效率的光调控策略,从宏观上分析了光质对微藻捕集CO2效率的影响,从微观上分析了碳代谢途径对光质调控的响应机制,并提出在深入剖析微藻生命周期光需求的条件下,结合实际情况和目标产物实施个性化、定制化的光调控策略。提高微藻在高碳环境下的固碳效率是微藻捕集CO2技术的首要问题,本文分析了高浓度CO2诱导下细胞内环境的维稳机制,从CO2传输过程和光合作用质能转化途径上深入探讨了高浓度CO2对微藻固碳的影响机制,为从代谢和分子水平刺激碳捕集过程,提高固碳效率提供了理论依据和重要参考。

关键词：二氧化碳捕集代谢生物质微藻光质

Determination of Hydrogen Production from Rich Filtration Combustion with Detailed Kinetics Based CFD Method

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Chinese Journal of Chemical Engineering 2008年第2期16卷 292-298页

作者：李国能周昊钱欣平岑可法 State Key Laboratory of Clean Energy Utilization Zhejiang University Hangzhou 310027 China

Computational fluid dynamics （CFD） combined with detailed chemical kinetics was employed to model the filtration combustion of a mixture of methane/air in a packed bed of uniform 3 mm diameter alumina spherical particles. The standard k-ε turbulence model and a methane oxidation mechanism with 23 species and 39 elemental reactions were used. Various equivalence ratios （1.47, 1.88, 2.12 and 2.35） were studied. The numerical results showed good agreement with the experimental data. For ultra-rich mixtures, the combustion temperature exceeds the adiabatic value by hundreds of centigrade degrees. Syngas （hydrogen and carbon monoxide） can be obtained up to a mole fraction of 23%. The numerical results also showed that the combination of CFD with detailed chemical kinetics gives good performance for modeling the pseudo-homogeneous flames of methane in porous media.

关键词： computational fluid dynamics coupled chemistry-hydrodynamics porous media super-adiabatic combustion

10kW向心透平内二次流形成机理与损失分析

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动力工程学报 2022年第8期42卷 722-730页

作者：李鹏李奇李国能韩旭韩中合华北电力大学能源动力与机械工程学院河北保定071003 华北电力大学河北省低碳高效发电技术重点实验室河北保定071003

为有效改善和提升有机工质向心透平的效率和性能,对10 kW向心透平进行热力设计和模拟计算,分析了静叶栅和动叶轮内部各种涡系的形成机理和表现形式,给出了静叶栅不同截面静压利用系数的分布以及动叶内部截面的总压分布。结果表明:静叶... 详细信息

为有效改善和提升有机工质向心透平的效率和性能,对10 kW向心透平进行热力设计和模拟计算,分析了静叶栅和动叶轮内部各种涡系的形成机理和表现形式,给出了静叶栅不同截面静压利用系数的分布以及动叶内部截面的总压分布。结果表明:静叶栅内存在压力面到吸力面的横向流动,在前缘和尾缘分别存在马蹄涡和尾迹涡,但并未捕捉到通道涡,马蹄涡的压力面分支会在1/2弦长位置到达吸力面;动叶轮中的涡系主要由前缘压力涡、通道涡以及泄漏涡组成,在动叶前缘压力侧轮毂面形成的涡与端部发展起来的通道涡相互交汇,加剧了此处的流动损失;0.6倍动叶叶高截面的流动状况最佳,由于动叶顶部泄漏涡与通道涡的相互掺混,使叶顶附近截面的流线分布较为复杂。

关键词：向心透平静叶栅动叶轮二次流漩涡数值模拟

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层流中脉动气流横掠平板强化传热

化工学报 2012年第6期63卷 1717-1722页

作者：李国能项忠晓郑友取胡桂林浙江科技学院新能源与节能技术研究所(筹) 浙江杭州310023

引言换热器是各种工业部门最常见的通用热工设备,广泛应用于化工、能源、机械、交通、制冷及航空航天等各个领域,是工业过程不可缺少的重要设备,提高换热器的工作性能直接影响到各个工业部门的设备能耗和低品位能源的回收程度,

关键词：层流脉动流强化传热横掠平板

Convective Heat Transfer Enhancement of a Rectangular Flat Plate by an Impinging Jet in Cross Flow

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Chinese Journal of Chemical Engineering 2014年第5期22卷 489-495页

作者：李国能郑友取胡桂林张治国 Department of Energy and Environment System Engineering Zhejiang University of Science and Technology

Experiments were carried out to study the heat transfer performance of an impinging jet in a cross *** parameters including the jet-to-cross-flow mass ratio(X=2%-8%), the Reynolds number(Red=1434-5735)and the jet diameter(d=2-4 mm) were explored. The heat transfer enhancement factor was found to increase with the jet-to-cross-flow mass ratio and the Reynolds number, but decrease with the jet diameter when other parameters maintain fixed. The presence of a cross flow was observed to degrade the heat transfer performance in respect to the effect of impinging jet to the target surface only. In addition, an impinging jet was confirmed to be capable of enhancing the heat transfer process in considerable amplitude even though the jet was not designed to impinge on the target surface.

关键词： impinging jet cross flow convection heat transfer heat transfer enhancement