Peculiarities Of 3 D Flow Development At Impinged And Swept Shock Wave Surface Interactions PDF Download
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| Total Pages | : 0 |
| Release | : 2002 |
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Download Peculiarities of 3-D Flow Development at Impinged and Swept Shock Wave/Surface Interactions Book in PDF, ePub and Kindle
Shock-wave/boundary-layer interactions (SWBLI) arise both in an external supersonic flow around various control surfaces of flying vehicles and in inlet ducts. Numerous situations with 3-D separated turbulent flows are especially complex and actively studied now. Accurate definition of their specific features and search of general properties are important for deeper understanding of their physics and development of computational models. Complex 3-D SWBLI are observed for example in the supersonic flow around the double-fin configuration (DF) mounted on a plate that models an inlet with three-dimensional compression and around the double-body of revolution (DR) over the surface. Interaction of swept crossing shock waves (SCSW) and expansion fans is realized in the first case. The second case is characterized by interaction of similar impinged disturbances with the surface. The objective of present study is a comparison of the features in development of such flows under a change of shock waves strength or a distance between the bodies. One of the effective techniques to specify the features of 3-D separation appearance and evolution is an analysis of the surface flow pattern visualization in the interaction regions (obtained by coating the test model surface with an oil film) because their topological properties can be theoretically grounded. For example a theorem is known that defines the number and type of singular points associated with separation and reattachment points as well as vortexes centers. Position of the coalescence and divergence lines which are associated with the boundaries of 3-D separation zones is defined by initial structure of these singular points.
| Author | : Holger Babinsky |
| Publisher | : Cambridge University Press |
| Total Pages | : 481 |
| Release | : 2011-09-12 |
| Genre | : Technology & Engineering |
| ISBN | : 1139498649 |
Download Shock Wave-Boundary-Layer Interactions Book in PDF, ePub and Kindle
Shock wave-boundary-layer interaction (SBLI) is a fundamental phenomenon in gas dynamics that is observed in many practical situations, ranging from transonic aircraft wings to hypersonic vehicles and engines. SBLIs have the potential to pose serious problems in a flowfield; hence they often prove to be a critical - or even design limiting - issue for many aerospace applications. This is the first book devoted solely to a comprehensive, state-of-the-art explanation of this phenomenon. It includes a description of the basic fluid mechanics of SBLIs plus contributions from leading international experts who share their insight into their physics and the impact they have in practical flow situations. This book is for practitioners and graduate students in aerodynamics who wish to familiarize themselves with all aspects of SBLI flows. It is a valuable resource for specialists because it compiles experimental, computational and theoretical knowledge in one place.
| Author | : Doyle D. Knight |
| Publisher | : |
| Total Pages | : 48 |
| Release | : 1988 |
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Download Theoretical Investigation of 3-D Shock Wave-Turbulent Boundary Layer Interactions Book in PDF, ePub and Kindle
The research concerns the understanding of 3-D shock wave-turbulent boundary layer interactions. The research activity has focused on several areas. First, the 3-D swept compression corner has been computed at Mach 3 for a sweep angle of 40 deg and compression angle of 24 deg. The calculated flows are in good agreement with experiment. Second, the flowfield structure of the 3-D swept compression corner is dominated by a large vortical structure. Third, the interaction has been found quantitatively to be dominated by inviscid effects except within a small fraction of the boundary layer. Fourth, the effect of boundary layer bleed has been examined for the 3-D shock wave-turbulent boundary layer interaction generated by a sharp fin. The effects of bleed are principally limited to the near surface region. The overall vortical structure is insensitive to surface bleed. Keywords: High speed flows; Viscous-inviscid interactions; Computational fluid dynamics; Navier-Stokes equations.
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| Total Pages | : 22 |
| Release | : 1985 |
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Download Computation of Three-dimensional Shock Wave and Boundary-layer Interactions Book in PDF, ePub and Kindle
| Author | : Doyle Knight |
| Publisher | : |
| Total Pages | : 76 |
| Release | : 1988 |
| Genre | : |
| ISBN | : |
Download Theoretical Investigation of 3-D Shock Wave-Turbulent Boundary Layer Interactions Book in PDF, ePub and Kindle
This research describes continuing efforts in the analysis of 3-D shock wave turbulent boundary layer interactions. A significant research activity in 3-D hypersonic shock turbulent interactions is initiated to further develop and validate the theoretical model. The quasiconical free interaction principle is examined by simulation of two geometries -17.5 deg sharp fin and (30,60) swept compression corner (Mach 3) - selected to obtain similar shock strengths. The comparison with experimental data is good. It is confirmed that the differences caused by the particular geometry of the model appear only behind the inviscid shock wave. Continuing research on 3-D turbulent interaction control is focused on the effect of bleed and the simulation of flows past the double-fin configuration. The effect of suction is examined on a strong (fin angle=20 deg, Mach 3) and a weak interaction (8 deg, Mach 3). The overall effect of bleed is remarkably modest. Two double-fin configurations (4 x 4 and 8 x 8, Mach 3) are simulated. A study of the computed flowfield indicates that the first is a weak interaction. In contrast, the 8 x 8 configuration displays an interesting separated flowfield. An analysis of viscous and inviscid effects in a sharp fin and a swept corner flow indicates that the physics of both geometries are governed primarily by inviscid (pressure) effects. Viscous effects are of lower magnitude but are not restricted to the sublayer region. High speed flows; Viscous inviscid interactions; Boundary layer interactions; Computational fluid dynamics; Navier stokes equations; Turbulence.(mjm).
| Author | : Doyle D. Knight |
| Publisher | : |
| Total Pages | : 80 |
| Release | : 1988 |
| Genre | : Navier-Stokes equations |
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Download Theoretical Investigation of 3-D Shock Wave-turbulent Boundary Layer Interactions Book in PDF, ePub and Kindle
| Author | : Seymour M. Bogdonoff |
| Publisher | : |
| Total Pages | : 75 |
| Release | : 1985 |
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Download Three-Dimensional Shock Wave and Turbulent Boundary Layer Interactions Book in PDF, ePub and Kindle
An extensive experimental study of three-dimensional shock wave turbulent boundary layer interactions caused by shock generators defined solely by angles has been carried out at Mach 3. Sharp fins, sharp swept fins, swept wedges, and semi-cones have been used to generate a wide range of shock waves. The interaction of these waves with turbulent boundary layers has been investigated by surface flow visualization, mean surface static pressure distributions, flowfield surveys of total pressure and yaw, and several flowfield visualization techniques. Some exploratory high frequency surface pressure measurements have been carried out to evaluate the steadiness of these interactions. Scaling laws for both surface and flowfield features have been derived. Some limited studies were carried out at a Mach number of 2. A flowfield study has shown that the initial part of interactions caused by the same strength and geometrical shock wave generated by different shock generators are all similar. The 'footprints' of the interactions, as shown by surface flow visualization, can be categorized as approximately conical or cylindrical, and the boundaries between these two regions have been defined for both Mach 3 and Mach 2. There are still questions with regards to the detailed flowfield structures and physical mechanisms, but the three-dimensional interactions appeared to be less unsteady than that of two-dimensional separated flows.
| Author | : Seymour M. Bogdonoff |
| Publisher | : |
| Total Pages | : 43 |
| Release | : 1986 |
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Download The Study of Shock Wave and Turbulent Boundary Layer Interactions Book in PDF, ePub and Kindle
The three dimensional shock wave turbulent boundary layer interaction generated by several shock generators defined solely by angles has been carried out at a Mach number of 3. Interactions with thin boundary layers were used to obtain overall characteristics, while interactions with thick boundary layers permitted detailed high resolution surveys. Investigations of the interactions were carried out by mean and high frequency surface pressure distribution measurements, surface flow visualization, and mean total head, yaw, and static pressure distributions through the flowfield. Major new data sets were obtained for the interaction of the shock wave generated by a 20 deg fin, and by a 24 deg wedge swept at 60 deg to the incoming flow. A series of tests were carried out to examine new concepts of three-dimensional interactions and extensive 'non-steady' results were obtained from the high frequency surface pressure distributions. Close coordination of the experiments with major computational efforts, support new concepts of flow structure and physics for these complex interactions. Keywords: Three-dimensional shock wave interactions; Conical similarity; Scaling laws; Conical/cylindrical boundary; Unsteady flow; Non-steady characteristics; flow physics and modeling; Supersonic characteristics.
| Author | : Masato Tamayama |
| Publisher | : |
| Total Pages | : 31 |
| Release | : 1994 |
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Download A study of three-dimensional interaction flow fields between swept shock waves and turbulent boundary layers - flow structures and effects of bleed Book in PDF, ePub and Kindle
| Author | : Rini van Dongen |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 371 |
| Release | : 2007-04-08 |
| Genre | : Technology & Engineering |
| ISBN | : 3540358463 |
Download Shock Wave Science and Technology Reference Library, Vol. 1 Book in PDF, ePub and Kindle
This book offers a timely reference on shock waves in multiphase flows, including new viewpoints and burgeoning developments. This volume treats shock and expansion waves in complex, bubbly liquids and cryogenic liquids. It also examines the relationship of shock waves with phase transitions and induced phase transitions as well as their interaction with solid foams, textiles, porous and granular media.
