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Showing 1 to 13 of 13 for “"Shock-induced separation"”.
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Numerical investigation of the wall temperature effects on shock-wave turbulent boundary layer interactions
The shock-wave turbulent boundary layer interaction (STBLI) is an important phenomenon in many practically relevant high-speed flow applications such as re-entry vehicles, air-breathing engines, rocket nozzles, etc. STBLI occurs in supersonic flow near solid surfaces where a shock wave is generated …
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Normal Shock Wave-Boundary Layer Interactions in Transonic Intakes at Incidence
… flow might accelerate to supersonic speeds. A shock wave might appear and impinge on the incoming boundary layer. Flow separation may result from this interaction, leading to severe flow distortion. In order to maximise fuel efficiency by reducing aerodynamic drag, slimmer nacelle designs are …
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Conditionally Analyzed Mean Velocity and Turbulence Measurements in a Plume-Induced Boundary Layer Separated Flowfield
The shock-induced separation process was found to dramatically increase the streamwise and transverse Reynolds normal stresses (which both peak near reattachment), the primary shear stress, and the normal stress anisotropy. The shock-separated shear layer consists of only a single layer with a …
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Numerical Solution of the Euler and the Navier-Stokes Equations for a Compressible Flow Problem
… Mach numbers considered. A supersonic bubble, a separation bubble, and a shock induced separation were observed from the calculations of the flow properties in the flow field.
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High resolution algorithms for the Navier Stokes equations for generalized descretizations
… value problems, Ringleb’s flow, an inviscid shock reflection, a flat plate boundary layer, and a shock induced separation over a flat plate. Three dimensional results include the ONERA M6 wing. All of the unstructured grids were generated using an advancing front mesh generation procedure. …
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Effect of Nozzle Pressure Ratio on Thrust and Flow Behavior in a Supersonic De Laval Nozzle
… pressure is lower than the ambient pressure, shock-induced separation may occur within the divergent section of the nozzle, potentially degrading nozzle performance. Understanding the aerodynamic behavior of nozzles operating under off-design conditions is therefore important for improving …
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An experimental investigation of the use of air jet vortex generators to control shock induced boundary layer separation
… showed that their effectiveness in delaying shock induced boundary layer separation was not as good as conventional vane type generators. Recent low speed wind tunnel tests carried out at City University indicated that the strength of the vortex could be increased considerably by using …
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Three Problems Involving Compressible Flow with Large Bulk Viscosity and Non-Convex Equations of State
… we consider the reflection of an oblique shock from a laminar flat plate boundary layer. The flow is taken to be two-dimensional, steady, and the gas model is taken to be a perfect gas with constant Prandtl number. The plate is taken to be adiabatic. The full Navier-Stokes equations are …
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An experimental rig to investigate crosswind effects on intake flow behaviour
… which are at risk of experiencing boundary layer separation under aerodynamically difficult conditions. One particularly problematic condition is the crosswind experienced during runway operations, which can lead to downstream distortion of the flow at the fan plane. Due to the complex nature of …
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Corner effects for oblique shock wave/turbulent boundary layer interactions in rectangular channels
… cross-section wind tunnel a separated oblique shock reflection is set to interact with the turbulent boundary layer (oblique SBLI) both on the bottom wall and in the corner formed by the intersection of the floor with the side-walls. In such a scenario, shock-induced separation is often seen in …
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Shock oscillation mechanisms of highly separated transitional shock-wave/boundary-layer interactions
… is higher blade loading, leading to larger separations. These conditions combined induce a shock oscillation with frequencies approximately matching the blade's natural structural frequencies. This resonance causes excitation and vibrations, which, if not mitigated, can lead to fatigue and …
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The Impact of Surface Roughness on Transonic Inlet Lip-Flows at Incidence
… a local supersonic region, terminated by a shock wave. This creates a shock wave-boundary-layer interaction, which could lead to detrimental consequences on the global flow-field. To meet future environmental regulations, new, larger, engines are being designed with a higher bypass ratio. …
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Numerical and experimental investigation of VG flow control for a low-boom inlet
The application of vortex generators (VGs) for shock/boundary layer interaction flow control in a novel external compression, axisymmetric, low-boom concept inlet was studied using numerical and experimental methods. The low-boom inlet design features a zero-angle cowl and relaxed isentropic …