Graphene oxide(GO)filler containing diversified Nafion-based proton exchange membrane(PEM)is studied to know the unique physical and chemical properties and performances of PEM.Nafion-SPEEK 1%-GO 0.75%(NSG-0.75%)compo...Graphene oxide(GO)filler containing diversified Nafion-based proton exchange membrane(PEM)is studied to know the unique physical and chemical properties and performances of PEM.Nafion-SPEEK 1%-GO 0.75%(NSG-0.75%)composite shows the highest proton conductivity of 0.327 S·cm^(-1) at 90℃ and 100%RH(relative humidity)among all the PEM investigated.The descending order of significant proton conductivity is found as;Nafion-sPGO(1%)0.306 S·cm^(-1)>Nafion/ZIF-8@GO 0.280 S·cm^(-1)>Nafion/PGO(2%)0.277 S·cm^(-1)>Nafion/GO-sulfur(3%)0.232 S·cm^(-1)>Nafion/GO-poly-SPM-co-PEGMEMA(1%)0.229 S·cm^(-1)>Nafion/Ce-sPGO(1%)0.215 S·cm^(-1).The proton conductivity,water uptake capacity and ion exchange capacity,hydration number,thermal and oxidative stability,mechanical integrity(tensile strength),maximum power,and current density are found to be increased while activation energy and fuel crossover show a decrement as GO or modified GO is incorporated in the Nafion matrix.Principal component analysis(PCA)predicted a significant correlation between the proton conductivity and the properties;the water uptake capacity,ion exchange capacity,hydration number,maximum power density,and maximum current density are 0.598%,0.688%,0.894%,0.980%,and 0.852%accordingly.A multiple linear model equation of proton conductivity is defined with the parameters of water uptake capacity,ion exchange capacity,hydration number,maximum power density,and maximum current density whereas the regression coefficient is 0.9923.展开更多
针对喷嘴表面结焦积炭问题会对航空发动机整体性能及安全性能产生重要影响,以当量比及航煤组分含量变化作为影响因素,采用动态燃烧实验方式,研究燃烧工况变化和正十六烷及丁基苯在与纯航煤掺混后的混合油中其质量分数的变化对喷嘴表面...针对喷嘴表面结焦积炭问题会对航空发动机整体性能及安全性能产生重要影响,以当量比及航煤组分含量变化作为影响因素,采用动态燃烧实验方式,研究燃烧工况变化和正十六烷及丁基苯在与纯航煤掺混后的混合油中其质量分数的变化对喷嘴表面结焦积炭产生的影响。实验后发现喷嘴表面的结焦积炭量随着当量比的减小呈现出不同的变化趋势,其中喷嘴附近燃烧区温度变化及燃气的卷吸和回流作用增强是影响结焦积炭量变化的主要因素。在本文实验工况下,当掺混比例均为10%时,混合油中丁基苯的质量分数变化对结焦积炭量影响比同掺混比例下正十六烷大19%。并且在SEM(Scanning Electron Microscope)分析后发现,燃油小液滴及游离碳氢微团在燃烧态条件下通过高温裂解结焦过程,在喷嘴表面形成了复杂无序和疏松多孔的网片状结构,包括短丝状焦和颗粒球状焦炭的沉积和附着。因此适当的燃烧当量比及航煤中组分含量的变化,可减少喷嘴表面结焦积炭的沉积附着。展开更多
文摘Graphene oxide(GO)filler containing diversified Nafion-based proton exchange membrane(PEM)is studied to know the unique physical and chemical properties and performances of PEM.Nafion-SPEEK 1%-GO 0.75%(NSG-0.75%)composite shows the highest proton conductivity of 0.327 S·cm^(-1) at 90℃ and 100%RH(relative humidity)among all the PEM investigated.The descending order of significant proton conductivity is found as;Nafion-sPGO(1%)0.306 S·cm^(-1)>Nafion/ZIF-8@GO 0.280 S·cm^(-1)>Nafion/PGO(2%)0.277 S·cm^(-1)>Nafion/GO-sulfur(3%)0.232 S·cm^(-1)>Nafion/GO-poly-SPM-co-PEGMEMA(1%)0.229 S·cm^(-1)>Nafion/Ce-sPGO(1%)0.215 S·cm^(-1).The proton conductivity,water uptake capacity and ion exchange capacity,hydration number,thermal and oxidative stability,mechanical integrity(tensile strength),maximum power,and current density are found to be increased while activation energy and fuel crossover show a decrement as GO or modified GO is incorporated in the Nafion matrix.Principal component analysis(PCA)predicted a significant correlation between the proton conductivity and the properties;the water uptake capacity,ion exchange capacity,hydration number,maximum power density,and maximum current density are 0.598%,0.688%,0.894%,0.980%,and 0.852%accordingly.A multiple linear model equation of proton conductivity is defined with the parameters of water uptake capacity,ion exchange capacity,hydration number,maximum power density,and maximum current density whereas the regression coefficient is 0.9923.
文摘针对喷嘴表面结焦积炭问题会对航空发动机整体性能及安全性能产生重要影响,以当量比及航煤组分含量变化作为影响因素,采用动态燃烧实验方式,研究燃烧工况变化和正十六烷及丁基苯在与纯航煤掺混后的混合油中其质量分数的变化对喷嘴表面结焦积炭产生的影响。实验后发现喷嘴表面的结焦积炭量随着当量比的减小呈现出不同的变化趋势,其中喷嘴附近燃烧区温度变化及燃气的卷吸和回流作用增强是影响结焦积炭量变化的主要因素。在本文实验工况下,当掺混比例均为10%时,混合油中丁基苯的质量分数变化对结焦积炭量影响比同掺混比例下正十六烷大19%。并且在SEM(Scanning Electron Microscope)分析后发现,燃油小液滴及游离碳氢微团在燃烧态条件下通过高温裂解结焦过程,在喷嘴表面形成了复杂无序和疏松多孔的网片状结构,包括短丝状焦和颗粒球状焦炭的沉积和附着。因此适当的燃烧当量比及航煤中组分含量的变化,可减少喷嘴表面结焦积炭的沉积附着。
