为了提高天然气燃烧速度,促进火焰传播,提高火焰稳定性,研究了稀燃条件下电场对层流预混火焰的影响。进行了常温、常压下的定容燃烧弹试验,分析了负电场和高频交流电场对天然气/空气预混稀燃火焰形状、燃烧压力、压力升高率、火焰燃烧...为了提高天然气燃烧速度,促进火焰传播,提高火焰稳定性,研究了稀燃条件下电场对层流预混火焰的影响。进行了常温、常压下的定容燃烧弹试验,分析了负电场和高频交流电场对天然气/空气预混稀燃火焰形状、燃烧压力、压力升高率、火焰燃烧期的影响。结果表明:过量空气系数1.6下,加载交直流电场均使火焰发生形变;当加载直流-5 kV电场与有效值为5 kV频率5、10、15和25 k Hz交流电场时,燃烧压力峰值分别增大6.96%、8.84%、10.50%、13.78%、14.40%,峰值到达时间提前14.67%、13.58%、18.93%、25.41%、27.97%;加载交直流电场,主要使火焰初始燃烧期缩短。交直流电场对火焰均有促进作用,且高频交流电场对火焰的促进作用优于直流电场。展开更多
A simple strategy to prepare a hybrid of nanocomposites of anatase TiO2/graphene nanosheets （GNS） as anode materials for lithium-ion batteries was reported.The morphology and crystal structure were studied by X-ray ...A simple strategy to prepare a hybrid of nanocomposites of anatase TiO2/graphene nanosheets （GNS） as anode materials for lithium-ion batteries was reported.The morphology and crystal structure were studied by X-ray diffraction （XRD）,field emission scanning electron microscopy （FE-SEM） and transmission electron microscopy （TEM）.The electrochemical performance was evaluated by galvanostatic charge-lischarge tests and alternating current （AC） impedance spectroscopy.The results show that the TiO2/GNS electrode exhibit higher electrochemical performance than that of TiO2 electrode regardless of the rate.Even at 500 mA/g,the capacity of TiO2/GNS is 120.3 mAh/g,which is higher than that of TiO2 61.6 mAh/g.The high performance is attributed to the addition of graphene to improve electrical conductivity and reduce polarization.展开更多
文摘为了提高天然气燃烧速度,促进火焰传播,提高火焰稳定性,研究了稀燃条件下电场对层流预混火焰的影响。进行了常温、常压下的定容燃烧弹试验,分析了负电场和高频交流电场对天然气/空气预混稀燃火焰形状、燃烧压力、压力升高率、火焰燃烧期的影响。结果表明:过量空气系数1.6下,加载交直流电场均使火焰发生形变;当加载直流-5 kV电场与有效值为5 kV频率5、10、15和25 k Hz交流电场时,燃烧压力峰值分别增大6.96%、8.84%、10.50%、13.78%、14.40%,峰值到达时间提前14.67%、13.58%、18.93%、25.41%、27.97%;加载交直流电场,主要使火焰初始燃烧期缩短。交直流电场对火焰均有促进作用,且高频交流电场对火焰的促进作用优于直流电场。
基金Project(Y4110230)supported by Natural Science Foundation of Zhejiang Province,ChinaProject(51204146,51101140)supported by the National Natural Science Foundation of ChinaProject(2012M521197)supported by Postdoctoral Science Foundation of China
文摘A simple strategy to prepare a hybrid of nanocomposites of anatase TiO2/graphene nanosheets （GNS） as anode materials for lithium-ion batteries was reported.The morphology and crystal structure were studied by X-ray diffraction （XRD）,field emission scanning electron microscopy （FE-SEM） and transmission electron microscopy （TEM）.The electrochemical performance was evaluated by galvanostatic charge-lischarge tests and alternating current （AC） impedance spectroscopy.The results show that the TiO2/GNS electrode exhibit higher electrochemical performance than that of TiO2 electrode regardless of the rate.Even at 500 mA/g,the capacity of TiO2/GNS is 120.3 mAh/g,which is higher than that of TiO2 61.6 mAh/g.The high performance is attributed to the addition of graphene to improve electrical conductivity and reduce polarization.
