The Effect of Sweep on Conditions at Separation in Turbulent Boundary-Layer/Shock-Wave Interaction

Myring, D. F.

doi:10.1017/s0001925900008015

Cited by 5 publications

(5 citation statements)

References 5 publications

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“…8 for conical interactions; in other words, case (d) coincides with case (c). The incipient separation line formed from the upstream uniquely corresponds to that defined by Stanbrook's criterion (Inger, 1986; Myring, 1977). However, for conical interactions, there is an angle difference between case(c) and case (d) in Fig.…”

Section: Physical Mechanism For Incipient Separationmentioning

confidence: 91%

“…A typical schematic of surface flow from flow visualization experiments is shown in Fig.2. The surface flow pattern formed by a sharp fin is conical(Lu, 1993;Settles and Dolling, 1992;Oudheusden et al, 1996), and not cylindrical(Johnston, 1960;Myring, 1977;Knight et al, 1992;Van Oudheusden et al, 1996). The topological pattern of the surface streamlines in conical interactions has been interpreted recently by Van Oudheusden et al(1996).In Fig.2, the schematic surface pattern depicts a geometric conicity, in that rays are shown emanating from a certain origin close to the fin apex.…”

mentioning

confidence: 82%

“…If the flow is cylindrical as analyzed in Inger (1986) and Myring (1977), there exists none of the stage between case(c) and case (d) in Fig.8 Myring, 1977). However, for conical interactions, there is an angle difference between case(c) and case (d) in Fig.8.…”

Section: Physical Mechanism For Incipient Separationmentioning

confidence: 96%

“…Thus, the theory developed by Johnston can be used to analyze the boundary-layer in SW/TBLI. Indeed, Lowrie(see Green, 1970) and Myring (1977) have used this model in their studies of SW/TBLI. Johnston divided the turbulent boundary layer into two regions along the direction of boundary layer thickness.…”

Section: Theorymentioning

confidence: 99%

“…3. Besides Smith (1972), this equation has been used by Myring (1977) and Swafford and Whitfield (1985).…”

Section: The Parameter Amentioning

confidence: 99%

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Incipient separation in shock wave/boundary layer interactions as induced by sharp fin

2006

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The incipient separation induced by the shock wave/ turbulent boundary layer interaction at the sharp fin is the subject of present study. Existing theories for the prediction of incipient separation, such as those put forward by McCabe (1966) and Dou and Deng (1992), can have thus far only predicting the direction of surface streamline and tend to over-predict the incipient separation condition based on the Stanbrook's criterion. In this paper, the incipient separation is firstly predicted with Dou and Deng (1992)'s theory and then compared with ' experimental data. The physical mechanism of the incipient separation as induced by the shock wave/turbulent boundary layer interactions at sharp fin is explained via the surface flow pattern analysis.Furthermore, the reason for the observed discrepancy between the predicted and experimental incipient separation conditions is clarified. It is found that when the wall limiting streamlines behind the shock wave becomes aligning with one ray from the virtual origin as the strength of shock wave increases, the incipient separation line is formed at which the wall limiting streamline becomes perpen- Knight et al., 2003). However, the cost of a full Navier-Stokes calculation is still fairly exorbitant, especially for 3D flows. In addition, issues relating to the accuracy from a physical point of view (besides the numerical accuracy) for purpose of quantitative comparison to experiments and the elucidation of the complex physical flow are not always satisfactory. Therefore, some analytical work like the simple predictive methods is still imperative for an initial estimate of the main flow physics based on preliminary design and then for progress to the subsequent stages leading eventually to the final prototype. To try to do a thorough simulation at the preliminary design stage is just too costly and most probably ineffective.In the past over 30 years or so, there are limited works carried out on the separation behaviour in SW/TBLI induced by a sharp fin on a flat plate as typified by Fig. 1 (Bogdonoff, 1987;Delery and Marvin, 1986;Green, 1970;Panaras, 1996;Settles and Dolling, 1992;Neumann and Hayes, 2002). As the onset or occurrence of flow separation invariably changes the topology of the flow field, one important and critical problem to resolve is how to judge or predict the incipient separation and its underlying flow physics. A typical topology of the surface flow pattern is shown schematically in outside the boundary layer. This analysis appears to have more fundamental physical basis than those by McCabe (1966), Korkegi (1973), or Lu (1989. Their results also show the trend of α i decreasing with increasing Re θ which had been previously discussed in Lu (1993) and Leung and Squire (1995). It may be noted that Leung and Squire's (1995) experimental data confirmed the same trend for α i versus Re θ as in Dou and Deng's theory. Furthermore, McCabe (1966) and Dou and Deng (1992c) found that the incipient separation angle α i via skin-friction line (also called ...

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Section: Physical Mechanism For Incipient Separationmentioning

confidence: 91%

mentioning

confidence: 82%

Section: Physical Mechanism For Incipient Separationmentioning

confidence: 96%

Section: Theorymentioning

confidence: 99%

“…3. Besides Smith (1972), this equation has been used by Myring (1977) and Swafford and Whitfield (1985).…”

Section: The Parameter Amentioning

confidence: 99%

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Incipient separation in shock wave/boundary layer interactions as induced by sharp fin

2006

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Analytical Investigation of Swept Shock-Turbulent Boundary Layer Interaction I N Supersonic Flow

Inger

1984

17th Fluid Dynamics, Plasma Dynamics, and Lasers Conference

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Supersonic viscous-inviscid interaction of a swept compression ramp with a turbulent boundary layer

Inger

1985

18th Fluid Dynamics and Plasmadynamics and Lasers Conference

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SummaryThis paper analyzes the supersonic interaction of a swept infinite compression ramp with an adiabatic turbulent boundary layer by means of a non-asymptotic triple deck approach combined with the non-isotropic eddy viscosity model of Rotta. Fundamental analytical descriptions of the 3-D disturbance flow field are obtained for a wide range of Mach number, Reynolds number, boundary layer shape factor and sweep angles.In particular, the following aspects are treated: (1) prediction of the dependence of the upstream influence on sweep angle; (2) assessment of the validity of the so-called independence principle, including deviations due to combined compressibility and turbulence effects plus the cross-flow component of the interactive turbulence, and (3) examination of the shear stress disturbance region close to the wall to obtain basic predictions for the 3-D skin friction line geometry and the onset of separation. Outline of the Nonasymptotic Interaction TheoryReferring to the planview of Fig. 1 we consider the idealized situation where the ramp is straight such that interactive disturbance flow gradients parallel to the ramp may be considered negligible (a/as = 0). For non-separating flows at high Reynolds numbers, a triple-deck approach can be applied to treat the very rapid, short-ranged changes occurring normal to the ramp (Fig. 2) as follows:(1) an outer region of potential inviscid flow above the boundary layer, which contains a compression shock and the

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The Effect of Sweep on Conditions at Separation in Turbulent Boundary-Layer/Shock-Wave Interaction

Cited by 5 publications

References 5 publications

Incipient separation in shock wave/boundary layer interactions as induced by sharp fin

Incipient separation in shock wave/boundary layer interactions as induced by sharp fin

Analytical Investigation of Swept Shock-Turbulent Boundary Layer Interaction I N Supersonic Flow

Supersonic viscous-inviscid interaction of a swept compression ramp with a turbulent boundary layer

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