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国家自然科学基金(11172006)

作品数:2 被引量:1H指数:1
发文基金:国家自然科学基金国家重点基础研究发展计划更多>>
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可压缩混合层被动标量实验研究
本研究开展了两种对流马赫数(0.1和0.5)情况下的平面可压缩混合层实验,采用单丝热线和米氏散射显示相结合的测量手段,获得了温度和物质浓度的空间统计分布,进而获得了在不同对流马赫数情况下可压缩混合层厚度随流向位置的变化规...
陈军佘振苏王铁进时晓天胡宁
关键词:可压缩混合层压缩性效应温度脉动
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Wavy structures in compressible mixing layers
2013年
Semi-periodic structures namely inclined wavy structures (IWS) are experimentally observed in compressible mixing layers at two convective Mach numbers (Mc = 0.11 and 0.47). Flow structures are visualized by the laserinduced planar laser Mie scattering (PLMS) technique. Two methods are developed to investigate the spatial distribu- tion and geometry of IWS: (1) the dominant mode extrac- tion (DME) method, to extract the dominant modes of IWS from the streamwise gray-level fluctuation, and (2) the phase tracking (PT) method, to identify the shape of IWS. The re- sults suggest that pressure perturbations account for the for- marion of IWS in the initial mixing region and the joint effect of dilatation and coherent vortices enhances IWS in the well- developed region. The large transverse (cross-flow) scale of the IWS and their relation to coherent vortices (CV) indicate that the disturbance originated from CV in the mixing center propagates far into the free streams. The DME and the PT method are shown to be the effective tools to study the geometrical features of wavy structures in compressible shear flows.
Jun ChenXiao-Tian ShiTie-Jin WangZhen-Su She
关键词:STRUCTURES
New scaling for compressible wall turbulence被引量:1
2013年
Classical Mach-number(M) scaling in compressible wall turbulence was suggested by van Driest(Van Driest E R.Turbulent boundary layers in compressible fluids.J Aerodynamics Science,1951,18(3):145-160) and Huang et al.(Huang P G,Coleman G N,Bradshaw P.Compressible turbulent channel flows:DNS results and modeling.J Fluid Mech,1995,305:185-218).Using a concept of velocity-vorticity correlation structure(VVCS),defined by high correlation regions in a field of two-point cross-correlation coefficient between a velocity and a vorticity component,we have discovered a limiting VVCS as the closest streamwise vortex structure to the wall,which provides a concrete Morkovin scaling summarizing all compressibility effects.Specifically,when the height and mean velocity of the limiting VVCS are used as the units for the length scale and the velocity,all geometrical measures in the spanwise and normal directions,as well as the mean velocity and fluctuation(r.m.s) profiles become M-independent.The results are validated by direct numerical simulations(DNS) of compressible channel flows with M up to 3.Furthermore,a quantitative model is found for the M-scaling in terms of the wall density,which is also validated by the DNS data.These findings yield a geometrical interpretation of the semi-local transformation(Huang et al.,1995),and a conclusion that the location and the thermodynamic properties associated with the limiting VVCS determine the M-effects on supersonic wall-bounded flows.
PEI JieCHEN JunFAZLE HussainSHE ZhenSu
可压缩混合层大尺度结构研究
本文通过对拟序结构的提取和分类方法以及几何特征量统计结果的讨论,以及对可压缩混合层多尺度结构的运动学分析,提出了多尺度结构间相互作用的基本过程,分析了压缩性对于混合区内多尺度流动结构的影响。通过灰度场涨落能谱分析发现,压...
陈军王铁进时晓天朱宏宇佘振苏
关键词:可压缩混合层拟序结构压缩性多尺度
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可压缩槽道湍流对流速度研究
本文对中等马赫数(M=0,0.8,2.0和3.0)的可压缩槽道湍流进行了三维直接数值模拟(DNS)计算,获得了可压缩条件下的瞬时流场。针对流向速度脉动U,通过两点速度脉动的时-空相关分析,获得了U在不同马赫数情况下的对流...
陈军裴杰Fazle Hussain佘振苏
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