【正】 The two dimensional steady stale numerical simulation system MESS for C-band power GaAs MESFET’s by finite clement method is presented in this paper. The improved charge lumping method and the hybrid finite cl...【正】 The two dimensional steady stale numerical simulation system MESS for C-band power GaAs MESFET’s by finite clement method is presented in this paper. The improved charge lumping method and the hybrid finite clement and finite difference scheme are used in discritization of poisson-continuity system. The grid generation and the improved coupled method for the solution of the Semiconductor basic equation are discribcd.展开更多
Lalo Classic Opera The King Duration:April 3rd-April 6th,2008 Avenue:National Grand Theater-Opera House Ticket Price:R MB 180/380/580/880/1080/1380 Performer:Theatre National de Toulouse of France Composer:Edouard Lal...Lalo Classic Opera The King Duration:April 3rd-April 6th,2008 Avenue:National Grand Theater-Opera House Ticket Price:R MB 180/380/580/880/1080/1380 Performer:Theatre National de Toulouse of France Composer:Edouard Lalo(French) Conductor:Michel Plasson(French) Edouard Lalo composed for a wide variety of forms, including stage,symphony orchestra,and chamber music. Unfortunately,his stature outside his homeland rests almost entirely on one spectacular violin showpiece,the Symphonie Espagnole.Within France,however,he is noted for his other works as well,including a single operatic masterpiece'Le Roi D'Ys'(the King of the legendary city of Ys).Lalo himself considered this work to be his greatest work.展开更多
Turbulent combustion remains to be one of most complicated technologies due to the complexities of turbulence and combustion as well as the interaction of both. This paper presents a vitiated coflow combustor, which i...Turbulent combustion remains to be one of most complicated technologies due to the complexities of turbulence and combustion as well as the interaction of both. This paper presents a vitiated coflow combustor, which is newly used for the fundamental research into turbulent combustion. The characteristics of controllable active thermo-atmosphere (CATA) of a vitiated coflow combustor are investigated. The results show that the oxygen mole frac- tion of vitiated coflow flames between 0% and 21% yield coflow temperature between 700 and 1500 K, and there is a constant temperature space as a cylinder with a radius of 40 mm. These features of the vitiated coflow indicate the exis- tence of a controllable active thermo-atmosphere, which benefits the basic study on the autoignition of a combustible mixture in a homogeneous charge compression ignition (HCCI) combustion.展开更多
The direct numerical simulation (DNS) method with 16 steps detailed chemical kinetics was applied to a lifted turbulent jet flame with H2/N2 fuel issuing into a wide hot coflow of lean combustion products,at temperatu...The direct numerical simulation (DNS) method with 16 steps detailed chemical kinetics was applied to a lifted turbulent jet flame with H2/N2 fuel issuing into a wide hot coflow of lean combustion products,at temperature of 1045 K and low oxygen concentrations. The chemical reactions were handled by the library function of CHEMKIN which was called by the main program in every time step. Parallel com-putational technology based on message passing interface method (MPI) was used in the simulation. All the cases were run by 12 CPUs on a high performance computer system. Faver-averaged DNS re-sults were obtained by long time averaging the transient profile and compared with the experimental data. The roll-up and evolution of the vortices in jet flame were well captured. The vortices in the same rotating direction attracted each other and those in different rotating directions repulsed each other. Through complex interactions between vortices,the original symmetrical vortex structure could be converted into nonsymmetrical and more complex structures by combination,distortion and splitting of the vortices. The transient profiles of H,OH and H2O mass fraction at 5.76 ms showed the flame structure in jet flame,especially the autoignition regions clearly. The lift-off height was about 9 d―11 d,in agreement with the experimental observation. At the corner point of the flame sheet indicated by OH and H profiles,the combustion was always enhanced by the flame curvature and extended resident time. The profiles of turbulence intensities show that the flames were diffused from the original two outside flame sheets into the core. The DNS results can be considered in developing more accurate and more universal turbulence models.展开更多
基金the National Scjcnce Foundation of China, Grant No:6883028
文摘【正】 The two dimensional steady stale numerical simulation system MESS for C-band power GaAs MESFET’s by finite clement method is presented in this paper. The improved charge lumping method and the hybrid finite clement and finite difference scheme are used in discritization of poisson-continuity system. The grid generation and the improved coupled method for the solution of the Semiconductor basic equation are discribcd.
文摘Lalo Classic Opera The King Duration:April 3rd-April 6th,2008 Avenue:National Grand Theater-Opera House Ticket Price:R MB 180/380/580/880/1080/1380 Performer:Theatre National de Toulouse of France Composer:Edouard Lalo(French) Conductor:Michel Plasson(French) Edouard Lalo composed for a wide variety of forms, including stage,symphony orchestra,and chamber music. Unfortunately,his stature outside his homeland rests almost entirely on one spectacular violin showpiece,the Symphonie Espagnole.Within France,however,he is noted for his other works as well,including a single operatic masterpiece'Le Roi D'Ys'(the King of the legendary city of Ys).Lalo himself considered this work to be his greatest work.
基金supported by the National Basic Research Priorities Programme(973)(Grant No.2001CB209203)
文摘Turbulent combustion remains to be one of most complicated technologies due to the complexities of turbulence and combustion as well as the interaction of both. This paper presents a vitiated coflow combustor, which is newly used for the fundamental research into turbulent combustion. The characteristics of controllable active thermo-atmosphere (CATA) of a vitiated coflow combustor are investigated. The results show that the oxygen mole frac- tion of vitiated coflow flames between 0% and 21% yield coflow temperature between 700 and 1500 K, and there is a constant temperature space as a cylinder with a radius of 40 mm. These features of the vitiated coflow indicate the exis- tence of a controllable active thermo-atmosphere, which benefits the basic study on the autoignition of a combustible mixture in a homogeneous charge compression ignition (HCCI) combustion.
基金China Postdoctoral Science Foundation (20060391042), the Key Project of Chinese National Programs for Fundamental Research and Development (2006CB200303)the National Natural Science Foundation for Distinguished Young Scholars (Grant No. 50525620)Natural Science Foundation of Zhejiang Prov-ince (Grant No. Z104314)
文摘The direct numerical simulation (DNS) method with 16 steps detailed chemical kinetics was applied to a lifted turbulent jet flame with H2/N2 fuel issuing into a wide hot coflow of lean combustion products,at temperature of 1045 K and low oxygen concentrations. The chemical reactions were handled by the library function of CHEMKIN which was called by the main program in every time step. Parallel com-putational technology based on message passing interface method (MPI) was used in the simulation. All the cases were run by 12 CPUs on a high performance computer system. Faver-averaged DNS re-sults were obtained by long time averaging the transient profile and compared with the experimental data. The roll-up and evolution of the vortices in jet flame were well captured. The vortices in the same rotating direction attracted each other and those in different rotating directions repulsed each other. Through complex interactions between vortices,the original symmetrical vortex structure could be converted into nonsymmetrical and more complex structures by combination,distortion and splitting of the vortices. The transient profiles of H,OH and H2O mass fraction at 5.76 ms showed the flame structure in jet flame,especially the autoignition regions clearly. The lift-off height was about 9 d―11 d,in agreement with the experimental observation. At the corner point of the flame sheet indicated by OH and H profiles,the combustion was always enhanced by the flame curvature and extended resident time. The profiles of turbulence intensities show that the flames were diffused from the original two outside flame sheets into the core. The DNS results can be considered in developing more accurate and more universal turbulence models.
