期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
微幅振荡流体表面波图谱显示方法 被引量:11
1
作者 高宇欣 鄂学全 《实验力学》 CSCD 北大核心 1998年第3期326-333,共8页
本文介绍一种能够清晰显示微幅高频振荡的流体表面波图谱结构的方法和产生高达100Hz频率、波幅为毫米以下的流体表面波的实验装置,即改进了FARA-DAY实验装置。用本实验装置和显示方法获得了精美的波幅图,并就几种波图作... 本文介绍一种能够清晰显示微幅高频振荡的流体表面波图谱结构的方法和产生高达100Hz频率、波幅为毫米以下的流体表面波的实验装置,即改进了FARA-DAY实验装置。用本实验装置和显示方法获得了精美的波幅图,并就几种波图作了简要说明。 展开更多
关键词 流动显示 流谱图 法拉第波 流体表面波
下载PDF
A hypersonic lift mechanism with decoupled lift and drag surfaces 被引量:7
2
作者 XU YiZhe XU ZhiQi +3 位作者 LI ShaoGuang LI Juan BAI ChenYuan WU ZiNiu 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2013年第5期981-988,共8页
In the present study, we propose a novel lift mechanism for which the lifting surface produces only lift. This is achieved by mounting a two-dimensional shock-shock interaction generator below the lifting surface. The... In the present study, we propose a novel lift mechanism for which the lifting surface produces only lift. This is achieved by mounting a two-dimensional shock-shock interaction generator below the lifting surface. The shock-shock interaction theory in conjunction with a three dimensional correction and checked with computational fluid dynamics (CFD) is used to analyze the lift and drag forces as function of the geometrical parameters and inflow Mach number. Through this study, though limited to only inviscid flow, we conclude that it is possible to obtain a high lift to drag ratio by suitably arranging the shock interaction generator. 展开更多
关键词 lift mechanism shock-shock interaction lift-to-drag ratio
原文传递
Numerical Investigation of Kinetic Energy and Surface Energy of Wavy Falling Liquid Film
3
作者 Mohammad Ariful Islam Akio Miyara +1 位作者 Takehiro Nosoko Toshiaki Setoguchi 《Journal of Thermal Science》 SCIE EI CAS CSCD 2007年第3期237-242,共6页
Numerical simulations have been carded out for two-dimensional wavy falling liquid film in order to investigate kinetic energy and surface energy of that liquid film. Governing equations, which are continuity equation... Numerical simulations have been carded out for two-dimensional wavy falling liquid film in order to investigate kinetic energy and surface energy of that liquid film. Governing equations, which are continuity equation, Na-, vier-Stokes equation, and equations of interfacial boundary conditions including surface movement and effect of surface tension, have been solved directly by means of a numerical scheme based on the finite difference method. In most cases, periodic disturbances superimposed at inflow boundary grow to fully developed waves Which retain the given periodic behavior. In some cases, however, random waves appear after the fully developed waves. Variations of kinetic energy and surface energy of the periodically developed waves and the random waves have been discussed. 展开更多
关键词 Falling liquid film surface wave kinetic energy surface energy.
原文传递
Quasi-stationary planetary wave-mean flow interactions in the Northern Hemisphere stratosphere and their responses to ENSO events 被引量:6
4
作者 LAN XiaoQing CHEN Wen WANG Lin 《Science China Earth Sciences》 SCIE EI CAS 2012年第3期405-417,共13页
Based on the ERA-40 reanalysis data from the European Centre for Medium-Range Weather Forecasts and the output of ECHAM5/MPI-OM, this study investigated the interactions between the quasi-stationary planetary wave (... Based on the ERA-40 reanalysis data from the European Centre for Medium-Range Weather Forecasts and the output of ECHAM5/MPI-OM, this study investigated the interactions between the quasi-stationary planetary wave (SPW) and mean flow, and their responses to E1 Nifio-Southern Oscillation (ENSO) events in the northern hemispheric stratosphere. Results show that the activity of SPW is the strongest in winter, when the SPW propagates along the polar waveguide into the stratosphere and along the low-latitude waveguide to the subtropical tropopause. The analysis of three dimensional SPW structure indicates that the main sources of SPW activity are located over the Eurasian continent and the North Pacific north of 45°N. On the one hand, the two waveguides of the SPW reflect the influence of mean flow on the propagation of the SPW. On the other hand, the upward propagating SPW can interact with the stratospheric mean flow, leading to deceleration of the zonal mean westerly. Furthermore, the SPW exhibits clear responses to ENSO events. During E1 Nifio winters, the SPW in the strat- osphere tends to propagate more upward and poleward. Its interactions with mean flow can induce a dipole pattern in zonal mean zonal winds, with accelerated westerly winds at low-middle latitudes and decelerated westerly winds at high latitudes. The ECHAM5/MPI-OM model reproduces the climatology of the SPW well. Although the simulated SPW is slightly weaker than the observations in the stratosphere, the model's performance has significant improvements compared with other GCMs used in previous studies. However, there are still some problems in the responses of the SPW to ENSO in the model. Although the model reproduces the responses of both the amplitude and the SPW-mean flow interactions to ENSO well in the troposphere, the stratospheric responses are quite weak. Therefore, further studies are needed to improve the simulation of the stratospheric atmospheric circulation and related dynamical processes. 展开更多
关键词 STRATOSPHERE quasi-stationary planetary wave wave-mean flow interaction ENSO
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部