Measurements of Incident-Shock Test Time and Reflected Shock Pressure at Fully Turbulent Boundary-Layer Test Conditions

An incident shock wave/turbulent boundary layer interaction at Mach 2.1 is investigated using particle image velocimetry in combination with data processing using the proper orthogonal decomposition, to obtain an instantaneous and statistical description of the unsteady flow organization. The global structure of the interaction is observed to vary considerably in time. Although reversed flow is often measured instantaneously, on average no reversed flow is observed. On an instantaneous basis, the interaction exhibits a multi-layered structure, characterized by a relatively high-velocity outer region and low-velocity inner region. Discrete vortical structures are prevalent along their interface, which create an intermittent fluid exchange as they propagate downstream. A statistical analysis suggests that the instantaneous fullness of the incoming boundary layer velocity profile is (weakly) correlated with the size of the separation bubble and position of the reflected shock wave. The eigenmodes show an energetic association between velocity fluctuations within the incoming boundary layer, separated flow region and across the reflected shock wave, and portray subspace features that represent the phenomenology observed within the instantaneous realizations.

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Flow patterns of dual-incident shock waves/turbulent boundary layer interaction

Journal of Visualization ◽

10.1007/s12650-020-00679-2 ◽

2020 ◽

Vol 23 (6) ◽

pp. 931-935

Author(s):

Xin Li ◽

Hui-jun Tan ◽

Yue Zhang ◽

He-xia Huang ◽

Yun-jie Guo ◽

...

Keyword(s):

Boundary Layer ◽

Shock Waves ◽

Turbulent Boundary Layer ◽

Flow Patterns ◽

Incident Shock ◽

Layer Interaction ◽

Boundary Layer Interaction

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Two-dimensional interaction between an incident shock and a turbulent boundary layer in the presence of an entropy layer

Fluid Dynamics ◽

10.1134/s0015462811060093 ◽

2011 ◽

Vol 46 (6) ◽

pp. 917-934 ◽

Cited By ~ 5

Author(s):

V. Ya. Borovoi ◽

I. V. Egorov ◽

A. Yu. Noev ◽

A. S. Skuratov ◽

I. V. Struminskaya

Keyword(s):

Boundary Layer ◽

Turbulent Boundary Layer ◽

Incident Shock ◽

Two Dimensional ◽

Entropy Layer ◽

Dimensional Interaction

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A Study on the Separation Length of Shock Wave/Turbulent Boundary Layer Interaction

International Journal of Aerospace Engineering ◽

10.1155/2019/8323787 ◽

2019 ◽

Vol 2019 ◽

pp. 1-10 ◽

Cited By ~ 1

Author(s):

Yong-yi Zhou ◽

Yi-long Zhao ◽

Yu-xin Zhao

Keyword(s):

Boundary Layer ◽

Shock Wave ◽

Turbulent Boundary Layer ◽

Incident Shock ◽

Computational Domain ◽

Layer Interaction ◽

Flow Parameters ◽

Boundary Layer Interaction ◽

High Mach ◽

Wave Boundary

The separation length of shock wave/boundary layer interaction (SWBLI) was studied by a numerical method, which was validated by experimental results. The computational domain was two-dimensional (2-D). The flow field was an incident oblique shock interacting with a turbulent boundary layer on a flat adiabatic plate. According to the simulation data, the dependency of the separation length on the relevant flow parameters, such as the incident shock strength, Reynolds number, and Mach number, was analyzed in the range of 2≤M≤7. Based on the relations with the flow parameters, two models of the separation length at low and high Mach numbers were proposed, respectively, which can be used to predict the extent of the separation in the SWBLI.

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Three-dimensional instantaneous structure of a shock wave/turbulent boundary layer interaction

Journal of Fluid Mechanics ◽

10.1017/s0022112008005090 ◽

2009 ◽

Vol 622 ◽

pp. 33-62 ◽

Cited By ~ 101

Author(s):

R. A. HUMBLE ◽

G. E. ELSINGA ◽

F. SCARANO ◽

B. W. van OUDHEUSDEN

Keyword(s):

Boundary Layer ◽

Shock Wave ◽

Turbulent Boundary Layer ◽

High Speed ◽

Large Scale ◽

Three Dimensional ◽

Reflected Shock Wave ◽

Layer Interaction ◽

Reflected Shock ◽

Boundary Layer Interaction

An experimental study is carried out to investigate the three-dimensional instantaneous structure of an incident shock wave/turbulent boundary layer interaction at Mach 2.1 using tomographic particle image velocimetry. Large-scale coherent motions within the incoming boundary layer are observed, in the form of three-dimensional streamwise-elongated regions of relatively low- and high-speed fluid, similar to what has been reported in other supersonic boundary layers. Three-dimensional vortical structures are found to be associated with the low-speed regions, in a way that can be explained by the hairpin packet model. The instantaneous reflected shock wave pattern is observed to conform to the low- and high-speed regions as they enter the interaction, and its organization may be qualitatively decomposed into streamwise translation and spanwise rippling patterns, in agreement with what has been observed in direct numerical simulations. The results are used to construct a conceptual model of the three-dimensional unsteady flow organization of the interaction.

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