开展了Mach数为1.23和1.41的冲击波作用下的Air/SF6斜界面不稳定性激波管实验,并利用王涛等人发展的可压缩多介质粘性流体和湍流大涡模拟程序MVFT(multi-viscous-fluid and turbulence),对该激波管实验进行了数值模拟,二者相比较一致性...开展了Mach数为1.23和1.41的冲击波作用下的Air/SF6斜界面不稳定性激波管实验,并利用王涛等人发展的可压缩多介质粘性流体和湍流大涡模拟程序MVFT(multi-viscous-fluid and turbulence),对该激波管实验进行了数值模拟,二者相比较一致性较好,包括界面图像、湍流混合区TMZ(turbulent mixing zone)宽度、气泡和尖钉位移,确认了该计算代码对界面不稳定性问题模拟的可靠性和有效性.数值模拟再现了冲击波作用下,Air/SF6斜界面的演化过程及流动中复杂波系结构的发展如冲击波的传播、折射和反射.结果还显示冲击波Mach数较大时,冲击波和界面相互作用时混合区获得的能量也较大,扰动界面发展的也更快.展开更多
P183.4 2000021466镜面物体往复通过弱湍流大气系统的成像=Imagingof mirror objects through the double passagesystem of atmospheric turbulence[刊,中]/张逸新,朱拓(无锡轻工大学机械系.江苏,无锡(214036)),倪晓武(南京理工大学应...P183.4 2000021466镜面物体往复通过弱湍流大气系统的成像=Imagingof mirror objects through the double passagesystem of atmospheric turbulence[刊,中]/张逸新,朱拓(无锡轻工大学机械系.江苏,无锡(214036)),倪晓武(南京理工大学应用物理系.江苏,南京(210014))//光学学报.-1999,19(5).-655-659分别利用部分相干理论、以广义椭球波函数为基础的Karhunen-Loe’ve展开和相干成像理论研究了弱湍流像差大气照明系统互强度函数传输特征和位于湍流介质中镜面物体成像规律。展开更多
The probability density function of irradiance fluctuations in a turbulent atmosphere remains an open topic of research.It is generally considered that the speckle field has an elliptical-Gaussian speckle distribution...The probability density function of irradiance fluctuations in a turbulent atmosphere remains an open topic of research.It is generally considered that the speckle field has an elliptical-Gaussian speckle distribution,but because of its complexity there is still no exact analytical solution.By introducing the concept of random fluctuation intensity and using an equiprobability density ellipse,exact models of the random fluctuation intensity and its phase are proposed.Through theoretical analysis and numerical simulation,it is concluded that the random fluctuation intensity and its corresponding phase are independent only under the circular-Gaussian approximation.展开更多
Y2001-62863-1 0118623Dirichlet、Neumann 和阻抗限制条件下粗糙表面的格林函数=Green’s function for rough surface with Dirichlet,Neumann,and impedance boundary conditions[会,英]/Ishimaru,A.& Rockway,J.D.//2000 5th In...Y2001-62863-1 0118623Dirichlet、Neumann 和阻抗限制条件下粗糙表面的格林函数=Green’s function for rough surface with Dirichlet,Neumann,and impedance boundary conditions[会,英]/Ishimaru,A.& Rockway,J.D.//2000 5th Interna-tional Symposium on Antennas,Propagation and EMTheory Proceedings.—1～4(PC)提出了1维平滑粗糙表面的相干与不相干粗糙表面格林函数分析理论。讨论了给定观测点的特殊强度。并以实例说明了这种理论的应用。展开更多
文摘开展了Mach数为1.23和1.41的冲击波作用下的Air/SF6斜界面不稳定性激波管实验,并利用王涛等人发展的可压缩多介质粘性流体和湍流大涡模拟程序MVFT(multi-viscous-fluid and turbulence),对该激波管实验进行了数值模拟,二者相比较一致性较好,包括界面图像、湍流混合区TMZ(turbulent mixing zone)宽度、气泡和尖钉位移,确认了该计算代码对界面不稳定性问题模拟的可靠性和有效性.数值模拟再现了冲击波作用下,Air/SF6斜界面的演化过程及流动中复杂波系结构的发展如冲击波的传播、折射和反射.结果还显示冲击波Mach数较大时,冲击波和界面相互作用时混合区获得的能量也较大,扰动界面发展的也更快.
文摘P183.4 2000021466镜面物体往复通过弱湍流大气系统的成像=Imagingof mirror objects through the double passagesystem of atmospheric turbulence[刊,中]/张逸新,朱拓(无锡轻工大学机械系.江苏,无锡(214036)),倪晓武(南京理工大学应用物理系.江苏,南京(210014))//光学学报.-1999,19(5).-655-659分别利用部分相干理论、以广义椭球波函数为基础的Karhunen-Loe’ve展开和相干成像理论研究了弱湍流像差大气照明系统互强度函数传输特征和位于湍流介质中镜面物体成像规律。
基金supported by the Special Foundation Program for Taishan Mountain Scholars
文摘The probability density function of irradiance fluctuations in a turbulent atmosphere remains an open topic of research.It is generally considered that the speckle field has an elliptical-Gaussian speckle distribution,but because of its complexity there is still no exact analytical solution.By introducing the concept of random fluctuation intensity and using an equiprobability density ellipse,exact models of the random fluctuation intensity and its phase are proposed.Through theoretical analysis and numerical simulation,it is concluded that the random fluctuation intensity and its corresponding phase are independent only under the circular-Gaussian approximation.
文摘Y2001-62863-1 0118623Dirichlet、Neumann 和阻抗限制条件下粗糙表面的格林函数=Green’s function for rough surface with Dirichlet,Neumann,and impedance boundary conditions[会,英]/Ishimaru,A.& Rockway,J.D.//2000 5th Interna-tional Symposium on Antennas,Propagation and EMTheory Proceedings.—1～4(PC)提出了1维平滑粗糙表面的相干与不相干粗糙表面格林函数分析理论。讨论了给定观测点的特殊强度。并以实例说明了这种理论的应用。
