研制成功了一种无需将燃烧弹壳体加热到高温,只需点燃可控预充可燃混合气即可模拟现代柴油机喷油时缸内高温、高压、高密度工作环境下高压燃油喷射特性及油束撞壁混合过程的定容燃烧喷雾模拟实验装置。此装置可以采用平面激光诱导荧光法...研制成功了一种无需将燃烧弹壳体加热到高温,只需点燃可控预充可燃混合气即可模拟现代柴油机喷油时缸内高温、高压、高密度工作环境下高压燃油喷射特性及油束撞壁混合过程的定容燃烧喷雾模拟实验装置。此装置可以采用平面激光诱导荧光法(PL IF)等多种光学方法对柴油喷雾油束特性及油束撞壁混合过程进行测量。经实验验证,此装置可以模拟实际发动机高达6.5 M Pa、1000 K的缸内高压、高温工作环境,并给出了模拟不同压力和温度时预充气组分各分压的理论计算方法及实验所得的压力—时间曲线,为测量现代柴油机的喷雾特性及油束撞壁混合过程提供了必要的条件。展开更多
The activity data of each component of a CaO–SiO2–Al2O3 system were calculated by thermodynamic software Factsage. The composition of low melting point inclusions in a CaO–SiO2–Al2O3–MgO system was analyzed by th...The activity data of each component of a CaO–SiO2–Al2O3 system were calculated by thermodynamic software Factsage. The composition of low melting point inclusions in a CaO–SiO2–Al2O3–MgO system was analyzed by thermodynamic calculation. The results show that the area of low melting point inclusions first increases then decreases with accumulating the alumina and magnesium oxide contents, respectively; the low melting area of CaO–SiO2–Al2O3–MgO inclusion is the biggest when the content of MgO and Al2O3 is 15%. To obtain low melting point inclusions, the alumina and magnesium contents should be approximately controlled to be 15%, and the CaO should be 40%.展开更多
An analytic method is proposed to calculate the formation enthalpy directly from empirical n-body potential and applied to the binary and ternary systems consisting of the refractory metals Mo, Nb, Ta and W. It turns ...An analytic method is proposed to calculate the formation enthalpy directly from empirical n-body potential and applied to the binary and ternary systems consisting of the refractory metals Mo, Nb, Ta and W. It turns out that the calculated enthalpies are in overall agreement with experimental observations and some other theoretical calculations. Interestingly, it shows that the formation enthalpies of the ternary systems are significantly affected by those of the constituent binary systems.展开更多
文摘研制成功了一种无需将燃烧弹壳体加热到高温,只需点燃可控预充可燃混合气即可模拟现代柴油机喷油时缸内高温、高压、高密度工作环境下高压燃油喷射特性及油束撞壁混合过程的定容燃烧喷雾模拟实验装置。此装置可以采用平面激光诱导荧光法(PL IF)等多种光学方法对柴油喷雾油束特性及油束撞壁混合过程进行测量。经实验验证,此装置可以模拟实际发动机高达6.5 M Pa、1000 K的缸内高压、高温工作环境,并给出了模拟不同压力和温度时预充气组分各分压的理论计算方法及实验所得的压力—时间曲线,为测量现代柴油机的喷雾特性及油束撞壁混合过程提供了必要的条件。
文摘The activity data of each component of a CaO–SiO2–Al2O3 system were calculated by thermodynamic software Factsage. The composition of low melting point inclusions in a CaO–SiO2–Al2O3–MgO system was analyzed by thermodynamic calculation. The results show that the area of low melting point inclusions first increases then decreases with accumulating the alumina and magnesium oxide contents, respectively; the low melting area of CaO–SiO2–Al2O3–MgO inclusion is the biggest when the content of MgO and Al2O3 is 15%. To obtain low melting point inclusions, the alumina and magnesium contents should be approximately controlled to be 15%, and the CaO should be 40%.
基金support from the National Natural Science Foundation of China (Grant Nos. 50531040 and 50871058)the Ministry of Science and Technology of China (Grant No. 2006CB605201), and the Administration of Tsinghua University
文摘An analytic method is proposed to calculate the formation enthalpy directly from empirical n-body potential and applied to the binary and ternary systems consisting of the refractory metals Mo, Nb, Ta and W. It turns out that the calculated enthalpies are in overall agreement with experimental observations and some other theoretical calculations. Interestingly, it shows that the formation enthalpies of the ternary systems are significantly affected by those of the constituent binary systems.
