TN252 98053169三层平板波导中光场能量分布的理论分析=Theo—retical analysis on optical field energy distribu—tion in three—layer slab waveguides[会,中]/冯秀琴,陈亚孚(长春光学精密机械学院。吉林,长春(130022))∥全国第八...TN252 98053169三层平板波导中光场能量分布的理论分析=Theo—retical analysis on optical field energy distribu—tion in three—layer slab waveguides[会,中]/冯秀琴,陈亚孚(长春光学精密机械学院。吉林,长春(130022))∥全国第八次光纤通信暨第九届集成光学学术会议文集。—湖北武汉,97.10从光流线量子力学的理论出发。展开更多
Due to the complexity of compressible flows,nonlinear hydrodynamic stability theories in supersonic boundary layers are not sufficient.In order to reveal the nonlinear interaction mechanisms of the rapidly amplified 3...Due to the complexity of compressible flows,nonlinear hydrodynamic stability theories in supersonic boundary layers are not sufficient.In order to reveal the nonlinear interaction mechanisms of the rapidly amplified 3-D disturbances in supersonic boundary layers at high Mach numbers,the nonlinear evolutions of different disturbances in flat-plate boundary layers at Mach number 4.5,6 and 8 are analyzed by numerical simulations.It can be concluded that the 3-D disturbances are amplified rapidly when the amplitude of the 2-D disturbance reaches a certain level.The most rapidly amplified 3-D disturbances are Klebanoff type(K-type)disturbances which have the same frequency as the 2-D disturbance.Among these K-type 3-D disturbances,the disturbances located at the junction of upper branch and lower branch of the neutral curve are amplified higher.Through analyzing the relationship between the amplification rate and the spanwise wavenumber of the 3-D disturbances at different evolution stages,the mechanism of the spanwise wavenumber selectivity of K-type 3-D disturbances in the presence of a finite amplitude 2-D disturbance is explained.展开更多
文摘TN252 98053169三层平板波导中光场能量分布的理论分析=Theo—retical analysis on optical field energy distribu—tion in three—layer slab waveguides[会,中]/冯秀琴,陈亚孚(长春光学精密机械学院。吉林,长春(130022))∥全国第八次光纤通信暨第九届集成光学学术会议文集。—湖北武汉,97.10从光流线量子力学的理论出发。
基金supported by the State Key Program of National Natural Science Foundation of China(Grant No.11332007)
文摘Due to the complexity of compressible flows,nonlinear hydrodynamic stability theories in supersonic boundary layers are not sufficient.In order to reveal the nonlinear interaction mechanisms of the rapidly amplified 3-D disturbances in supersonic boundary layers at high Mach numbers,the nonlinear evolutions of different disturbances in flat-plate boundary layers at Mach number 4.5,6 and 8 are analyzed by numerical simulations.It can be concluded that the 3-D disturbances are amplified rapidly when the amplitude of the 2-D disturbance reaches a certain level.The most rapidly amplified 3-D disturbances are Klebanoff type(K-type)disturbances which have the same frequency as the 2-D disturbance.Among these K-type 3-D disturbances,the disturbances located at the junction of upper branch and lower branch of the neutral curve are amplified higher.Through analyzing the relationship between the amplification rate and the spanwise wavenumber of the 3-D disturbances at different evolution stages,the mechanism of the spanwise wavenumber selectivity of K-type 3-D disturbances in the presence of a finite amplitude 2-D disturbance is explained.
