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| 1 | Experimental study of n-heptane ignition delay with carbon dioxide addition in a rapid compression machine under low-temperature conditions显示文摘The ignition delay of n-heptane homogeneous charge compression ignition(HCCI) combustion under high levels of carbon dioxide addition was quantitatively measured at elevated pressure from low to intermediate temperatures in a rapid compression machine.The experiments were conducted in the compressed temperature range 613-750 K.Both the compression ratio and fuel/air equivalence ratio were varied to investigate their effects on the ignition delay of n-heptane.Carbon dioxide was subsequently added to study the influence of the carbon dioxide level on the ignition delay of n-heptane under low-temperature conditions.It was found that carbon dioxide had different effects on the two-stages of ignition delay of n-heptane under low-temperature conditions:the concentration of carbon dioxide had little effect on the first-stage ignition time;a certain concentration of carbon dioxide accelerated the first-stage ignition but had a significantly larger impact on the second-stage ignition delay,thus increasing the overall ignition delay time.The results also showed that the first-stage ignition delay of n-heptane is only a function of temperature under low-temperature conditions.The mass of n-heptane in the combustible mixture,the equivalence ratio,and the pressure at the top dead center had little effect on the first-stage ignition time of n-heptane. | GUANG HuanYu YANG Zheng HUANG Zhen LU XingCai | 2012 | Chinese Science Bulletin2012，57，30： | 5 |
| 2 | Active fuel design A way to manage the right fuel for HCCI engines显示文摘同质的费用压缩点火(HCCI ) 引擎与汽油引擎相比展示高热的效率和 ultralow 排出物。然而, HCCI 燃烧不同于 SI 引擎,没有一个直接方法触发在里面柱体燃烧。因此,汽油 HCCI 燃烧在点火的控制正在面对挑战并且,燃烧,和运作的范围扩展。在这份报纸,一个活跃燃料设计概念被建议探索一条潜在的小径优化 HCCI 引擎燃烧并且拓宽它的运作的范围。活跃燃料设计概念被实时控制认识到双燃料(汽油和 n-heptane ) 移植注射,与用尽煤气的再通行(EGR ) 调整的率和吸入温度。在 HCCI 燃烧的 cylinderto- 柱体变化能被优化有效地在燃料注射比例减少,这被发现,并且到 HCCI 的从 SI 的快速的转变过程能被认识到。活跃燃料设计技术能显著地增加 HCCI 燃烧的适应性到增加的 EGR 率并且减少吸入温度。活跃燃料设计被显示拓宽运作的 HCCI 负担到 9.3 酒吧显示的吝啬的有效压力(IMEP ) 。当减少燃料消费和氮氧化物排出物时, HCCI 操作被多达 70% SI 模式负担使用。因此,活跃燃料设计技术能为干净引擎燃烧管理正确燃料,并且为引擎燃料多样化和未来引擎概念提供一条潜在的小径。 | Zhen HUANG Zhongzhao LI Jianyong ZHANG Xingcai LU Junhua FANG Dong HAN | 2016 | Frontiers in Energy2016，10，1： | 2 |
| 3 | Autoignition of butanol isomers/n-heptane blend fuels on a rapid compression machine in N_2/O_2/Ar mixtures显示文摘Ignition delay times of butanol isomers/n-heptane mixture were measured using a rapid compression machine at compressed pressures of 15,20 and 30 bar,in the compressed temperature range of 650–830 K and equivalence ratio of 1.0.Sensitivity analysis and reaction fluxes analysis were performed using a detailed mechanism of blend fuels so as to evaluate the impact of n-heptane addition and temperature variation on the ignition and combustion process.Over the experimental conditions in this study,the blend fuels displays apparent low and high temperature reactions and a negative-temperature-coefficient(NTC)behavior.With increasing butanol isomers mole fraction in the mixtures,the ignition delay times increase.It is worth noting that the suppression to n-heptane ignition from tert-butanol is very limited.The ignition delay time of 40/60 tert-butanol/n-heptane mixture is smaller than other three kinds of blends.With the increasing of tert-butanol mole fraction,the increasing range of its ignition delay time is very large.Moreover,compressed pressure has a limited effect on the ignition of blend mixture at low temperature but certain influence at medium temperature arrange.Tert-butanol/n-heptane mixture is not sensitive to the pressure.The chemical analysis indicates that butanol isomers also present the NTC behavior because of the low temperature reactivity radicals pool produced by n-heptane.Reaction fluxes analysis shows that the n-heptane addition has little impact on the reaction path.Sensitivity analysis shows that for the pure n-butanol,2-butanol and iso-butanol fuel,H-abstraction from the?-carbon plays the dominant role in the reactions having the inhibiting effect on the low-temperature branching,while the H-abstraction from the?-carbon can promote the ignition;for tert-butanol/n-heptane mixtures,reaction R16.H2O2(+M)<=>OH+OH(+M)plays the leading role.For n-butanol/n-heptane,iso-butanol/n-heptane mixtures,the major promoting reactions include some H-abstraction from n-heptane and OH branching reactions,the influence of H-abstraction from?-carbon is weaken;For 2-butanol/n-heptane,tert-butanol/n-heptane mixtures,R16 plays an absolutely dominant role,while the major inhibiting reactions add some elementary reactions of small radicals. | YANG Zheng WANG Yue YANG Xin QIAN Yong LU XingCai HUANG Zhen | 2014 | Science China(Technological Sciences)2014，57，3： | 1 |
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