Imaging of supersonic flow over a double elliptic surface

被引:2
作者
Zhang Qing-Hu [1 ]
Yi Shi-He [1 ]
He Lin [1 ]
Zhu Yang-Zhu [1 ]
Chen Zhi [1 ]
机构
[1] Natl Univ Def Technol, Coll Aerosp Sci & Engn, Changsha 410073, Hunan, Peoples R China
基金
中国国家自然科学基金;
关键词
coherent structures; separated flow; spatial correlation analysis; supersonic flow; COHERENT VORTICAL STRUCTURES; BOUNDARY-LAYER; TRANSITION; EVOLUTION; PIV;
D O I
10.1088/1674-1056/22/11/114703
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The coherent structures of flow over a double elliptic surface are experimentally investigated in a supersonic low-noise wind tunnel at Mach number 3 using nano-tracer planar laser scattering (NPLS) and particle image velocimetry (PIV) techniques. High spatiotemporal resolution images and velocity fields of both laminar and turbulent inflows over the test model are captured. Based on the time-correlation images, the spatial and temporal evolutionary characteristics of the coherent structures are investigated. The flow structures in the NPLS images are in good agreement with the velocity fluctuation fields by PIV. From statistically significant ensembles, spatial correlation analysis of both cases is performed to quantify the mean size and the orientation of coherent structures. The results indicate that the mean structure is elliptical in shape and the structural angles in the separated region of laminar inflow are slightly smaller than that of turbulent inflow. Moreover, the structural angles of both cases increase with their distance away from the wall.
引用
收藏
页数:7
相关论文
共 26 条
  • [1] Bookey P, 2005, 43 AER SCI M EXH 10
  • [2] Planar visualizations of large-scale turbulent structures in axisymmetric supersonic separated flows
    Bourdon, CJ
    Dutton, JC
    [J]. PHYSICS OF FLUIDS, 1999, 11 (01) : 201 - 213
  • [3] Cao YH, 2008, CHINESE PHYS LETT, V25, P3315, DOI 10.1088/0256-307X/25/9/059
  • [4] Flow visualization of supersonic laminar flow over a backward-facing step via NPLS
    Chen, Z.
    Yi, S. H.
    Tian, L. F.
    He, L.
    Zhu, Y. Z.
    [J]. SHOCK WAVES, 2013, 23 (04) : 299 - 306
  • [5] Dussauge J P, 2006, TURBULENT SHEAR LAYE, P323
  • [6] Direct least square fitting of ellipses
    Fitzgibbon, A
    Pilu, M
    Fisher, RB
    [J]. IEEE TRANSACTIONS ON PATTERN ANALYSIS AND MACHINE INTELLIGENCE, 1999, 21 (05) : 476 - 480
  • [7] Effects of upstream boundary layer on the unsteadiness of shock-induced separation
    Ganapathisubramani, B.
    Clemens, N. T.
    Dolling, D. S.
    [J]. JOURNAL OF FLUID MECHANICS, 2007, 585 : 369 - 394
  • [8] Analysing the structure of the optical path length of a supersonic mixing layer by using wavelet methods
    Gao Qiong
    Yi Shi-He
    Jiang Zong-Fu
    Zhao Yu-Xin
    Xie Wen-Ke
    [J]. CHINESE PHYSICS B, 2012, 21 (06)
  • [9] Visualization of coherent structures in a supersonic flat-plate boundary layer
    He Lin
    Yi ShiHe
    Zhao YuXin
    Tian LiFeng
    Chen Zhi
    [J]. CHINESE SCIENCE BULLETIN, 2011, 56 (06): : 489 - 494
  • [10] HOU YX, 2003, THESIS U TEXAS AUSTI