Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 16 of 16 for “"Shock wave boundary layer interactions"”.
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Unsteadiness in shock-wave/boundary layer interactions
… of the low-frequency unsteadiness observed in shock<br/>wave/turbulent boundary layer interactions has been driving research in this area for<br/>several decades. This work investigates the interaction between an impinging oblique<br/>shock and a supersonic turbulent boundary layer via …
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Sidewall effects in compression corner shock-wave/boundary-layer interactions
… inlets and research wind tunnels. When a shock wave boundary layer interaction (SBLI) occurs in a rectangular cross sectioned duct, the streamwise corner flows tend to separate, resulting in highly three-dimensional behaviour in the sidewall region. These corner separations have been seen …
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Laminar/transitional shock-wave/boundary-layer interactions (SWBLIs) in hypersonic flows
Numerical investigations of laminar shock-wave/boundary-layer interactions (SWBLIs) in hypersonic flow have been carried out at M? = 6.85 and M? ? 8, with unit Reynolds numbers ranging from 2.0 x 106 m- l to 7.60 x 106 m- l. This thesis deals with a simplified 2-D geometric configuration to …
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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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Shock oscillation mechanisms of highly separated transitional shock-wave/boundary-layer interactions
… of the turbofan engine. Consequently, a laminar boundary layer persists on the suction side of the transonic fan during cruise. Additionally, the trend in compressor design is higher blade loading, leading to larger separations. These conditions combined induce a shock oscillation with …
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The effects of micro-vortex generators on normal shock wave/boundary layer interactions
Shock wave/boundary-layer interactions (SWBLIs) are complex flow phenomena that are important in the design and performance of internal supersonic and transonic flow fields such as engine inlets. This investigation was undertaken to study the effects of passive flow control devices on normal shock …
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Numerical Modelling of Shock Wave Boundary Layer Interactions in Aero-engine Intakes at Incidence
… flow to supersonic speeds, terminating with a shock wave. This produces undesirable shock wave boundary layer interactions (SWBLIs). Reynolds-Averaged Navier Stokes (RANS) turbulence models have been shown to be insensitive to the effects of boundary layer relaminarisation present in these …
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The effects of pressure waves on turbulent oblique shock wave boundary layer interactions in rectangular channels
Oblique Shock Wave--Boundary-Layer interactions (oblique SBLIs) occur in many practical applications, such as in mixed compression supersonic jet intakes and transonic compressor cascades and can have significant detrimental effects on the downstream boundary layer, resulting in flow distortion, …
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Quantification of Spalart-Allmaras Turbulence Modeling Uncertainties for Hypersonic Flows Utilizing Output-Based Grid Adaptation
… error with complex flow features, such as shock wave-boundary-layer interactions (SBLI). The adapted meshes are generated using MIT Solution Adaptive Numerical Simulator (SANS) software, which is able to adapt high order unstructured meshes using a modified Continuous Galerkin (CG) finite …
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Computational analysis of plasma actuation for control of shock-laden flows in scramjet isolators
… but are limited by instabilities associated with shock wave-boundary layer interactions (SWBLIs). These interactions can diminish engine performance and cause unstart, an aerodynamic phenomenon that can have catastrophic consequences. Plasma actuation has emerged as a promising approach to …
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Design and development of a rectangular supersonic wind tunnel facility for the study of shock/boundary layer interactions
… to evaluate simple, passive, and bleedless inlet shock wave/boundary layer interaction control options, called micro-vortex generators. A new supersonic wind tunnel was designed and built on the University of Illinois campus to enhance high-speed flow testing capabilities used for studying these …
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An experimental investigation of flow control for supersonic inlets
This thesis focuses on the control of shock wave / boundary layer interactions (SWBLIs) in supersonic inlets. The overall aim of this study is to determine to what extent vortex generators (VGs) can mitigate flow separations within supersonic inlets. To achieve this, an experimental investigation …
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The role of aerothermochemistry in double cone and double wedge flows
… iv) to extend the experimental database for shock wave boundary/layer interactions. An expansion tube is used to generate flows with enthalpies ranging from 2.2-8.0 MJ/kg (2-4 km/s) and Mach numbers from 4-7. The expansion tube is a novel impulse facility for accelerating a test gas to these …
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Large eddy simulation of shock boundary layer interaction control using micro-vortex generators
… surfaces can be critically affected by shock wave / boundary layer interactions (SBLIs), whose severe adverse pressure gradients can cause boundary layer separation. Currently such problems are avoided primarily through the use of boundary layer bleed/suction which can be a source of …
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Modeling of shock boundary layer interactions and stability analysis using particle approaches
Hypersonic flow separation and laminar shock wave boundary layer interactions (SWBLIs) have received considerable attention since these interactions can lead to laminar to turbulent transition, unsteadiness, and localized high pressure and heating regions. Accurate predictions of these phenomena, …