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Author : Abdallah Antoun Sfeir
Publisher :
ISBN 13 :
Total Pages : 66 pages
Book Rating : 4.:/5 (21 download)
Download or read book Supersonic Flow Separation on a Backward Facing Step written by Abdallah Antoun Sfeir and published by . This book was released on 1966 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 42 pages
Book Rating : 4.:/5 (227 download)
Download or read book SUPERSONIC FLOW SEPARATION ON A BACKWARD FACING STEP. written by and published by . This book was released on 1966 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt: The paper describes an experimental survey of flow separation on backward facing steps having different heights at a Mach number of 2.4. Reattachment and critical points are found for three regimes, laminar, transitional, and turbulent. Reattachment occurs at a point where the pressure is 35% of the free stream value for turbulent flow, and 60% of this value in the laminar case. The length of the free shear layer is found to be one-half that of the separating streamline, a result which emphasizes the importance of the reattachment region. The flow downstream of the critical point is found to be relatively independent of the base flow. Disturbances in the spanwise direction are always observed in laminar flow but do not affect the base pressure.
Author : Jain-Ming Wu
Publisher :
ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (472 download)
Download or read book Experimental Investigation of Supersonic Flow Separation Over a Rearward Facing Step written by Jain-Ming Wu and published by . This book was released on 1970 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Donald R. Crawford
Publisher :
ISBN 13 :
Total Pages : 166 pages
Book Rating : 4.:/5 (21 download)
Download or read book Supersonic Separated Flow Downstream of a Backward Facing Step written by Donald R. Crawford and published by . This book was released on 1967 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: The method of integral relations is applied to the study of the viscous separated flow field downstream of a backward facing step in laminar supersonic flow. The boundary layer equations are reduced to a set of coupled ordinary differential equations in a formulation which incorporates a two parameter velocity profile. The neighborhood of the corner and the reattachment point are examined in detail, taking into account the proper interaction between the viscous and inviscid flow. The complete flow field in these regions is found from the analyses of the limiting forms of the equations. In particular, it is found that the pressure gradient and thickness of the boundary layer at the reattachment point are related and cannot be arbitrarily specified. (Author).
Author : Jean J. Ginoux
Publisher :
ISBN 13 :
Total Pages : 75 pages
Book Rating : 4.:/5 (227 download)
Download or read book LAMINAR SEPARATION IN SUPERSONIC FLOW. written by Jean J. Ginoux and published by . This book was released on 1964 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: Detailed experimental investigations were made at a Mach number of 2.21 of laminar flows over ramps, backward facing steps and swept back wings. Large spanwise variations of the heat transfer coefficient (h) were measured, with two different techniques, in the reattachment region of the flow over a backward facing step and were related to streamwise vortices present in the laminar boundary layer. Peaks in h much larger than the turbulent value were measured. By comparing spanwise total head and heat transfer rate distributions, Reynolds analogy was found to apply quantitatively for reattaching flows with streamwise vortices. The effect of free-stream Reynolds number and of leading edge sweep, accuracy of machining, thickness and bevel angle on the intensity of streamwise vortices present in the boundary layer on swept back wings was investigated. Flow separation was detected at the leading edge. A regular pattern of streamwise vortices of small wave length was observed outside of the boundary layer.
Author : Odus R. Burggraf
Publisher :
ISBN 13 :
Total Pages : 56 pages
Book Rating : 4.:/5 (227 download)
Download or read book Computational Study of Supersonic Flow Over Backward-Facing Steps at High Reynolds Number written by Odus R. Burggraf and published by . This book was released on 1970 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: The problem of laminar separated flow over a backward-facing step is solved numerically for the limiting case of infinite Reynolds number. The flow model adopted is that deduced by Batchelor for incompressible flow: an inviscid rotational eddy confined within the recirculation portion of the separated shear layer. It is argued that the reattachment process is essentially inviscid in the limit R approaches infinity, and the flow field in the reattachment zone is computed on this basis. The computed results support Chapman's model of the reattachment process as the correct limit case, to second-order accuracy, as the flow angle entering the reattachment zone approaches zero. For the recirculation zone, the boundary-layer equations are simplified by assuming a constant pressure eddy. The Dorodnitsyn transformation is applied and numerical solutions obtained using an implicit finite-difference scheme. The solutions are carried out from station-to-station in the direction of flow over a complete cycle of recirculation. Iteration yields the unique value of the vorticity in the inviscid layer upstream of separation, including the effects of corner expansion and recirculation on the development of the separated shear layer. (Author).
Author : Zhengming Wu
Publisher :
ISBN 13 :
Total Pages : 164 pages
Book Rating : 4.3/5 (91 download)
Download or read book Fundamental Studies of Subsonic and Transonic Flow Separation written by Zhengming Wu and published by . This book was released on 1979 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : G. J. Thomke
Publisher :
ISBN 13 :
Total Pages : 180 pages
Book Rating : 4.:/5 (227 download)
Download or read book Separation and Reattachment of Supersonic Turbulent Boundary Layer Behind Down Stream Facing Steps and Over Cavities written by G. J. Thomke and published by . This book was released on 1964 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface pressure measurements were obtained for the flow regimes created when a turbulent boundary layer in supersonic flow separates over the classical downstream-facing step and over a cavity. The experiments were conducted in the Mach number range 2.0 to 4.0 on a model having a ducted, one-foot diameter, axisymmetric body. The model provided step heights of 0.250, 1.020, and 1.675 inches, cavity lengths of 0.837 and 1.675 inches, and a cavity depth of 1.675 inches. The recompression shoulder of the cavity had either a square or a rounded shape. In general, the pressure rise at reattachment is found to be in good agreement with Korst's theory. The shape and scale of the reattachment pressure distribution are influenced considerably by Mach number. Reattachment occurs at a point where the pressure rise is about 50% complete. A point of flow reversal is found to be located upstream of the reattachment point. (Author).
Author : Seong-Ok Choy
Publisher :
ISBN 13 :
Total Pages : 224 pages
Book Rating : 4.:/5 (49 download)
Download or read book Modular Analysis of Supersonic Flow Past a Backward Facing Step written by Seong-Ok Choy and published by . This book was released on 1998 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : James E. Danberg
Publisher :
ISBN 13 :
Total Pages : 34 pages
Book Rating : 4.:/5 (227 download)
Download or read book An Algebraic Turbulence Model for Flow Separation Caused by Forward and Backward Facing Steps written by James E. Danberg and published by . This book was released on 1989 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Baldwin-Lomax algebraic turbulence model is currently widely used in numerical Navier-Stokes codes primarily because it avoids the problems of calculating a boundary layer thickness. However, two of its disadvantages are: 1) it requires the evaluation of a maximum in the moment of vorticity with respect to the surface which is ambiguous under certain conditions and, 2) its applicability to some separated flows is unclear. The basis for the Baldwin-Lomax method is reviewed in detail particularly as it applies to locally separated flows. This leads to a reformulation of the Baldwin-Lomax method. The modification uses a velocity scale, at each separated flow station, which is the difference between the maximum velocity and the minimum velocity (considered negative in separated flows with recirculation regions). The length scale is defined in terms of the ratio of this velocity scale to the maximum vorticity. Other modifications are included which adapt the model to forward and rearward facing step applications. Keywords: Fluid mechanics; Turbulent flow; Forward and backward steps; Separated flow; Supersonic flow; Turbulence modeling; Algebraic model. (JHD).
Author : Kaveh Taghavi
Publisher :
ISBN 13 :
Total Pages : 240 pages
Book Rating : 4.:/5 (194 download)
Download or read book Unsteady Reattachment of Supersonic Flow Past a Backward-facing Step written by Kaveh Taghavi and published by . This book was released on 1988 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Eric Loth
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book Supersonic Flow Over an Axisymmetric Backward Facing Step written by Eric Loth and published by . This book was released on 1990 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Josef Rom
Publisher :
ISBN 13 :
Total Pages : 55 pages
Book Rating : 4.:/5 (227 download)
Download or read book Heat Transfer in the Laminar Supersonic Separated Flow Behind an Axisymmetrical Backward Facing Step written by Josef Rom and published by . This book was released on 1968 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt: Heat transfer rates are measured in the separated and reattaching flow regions behind an axisymmetrical backward facing step on a cone-cylinder model, in the high enthalpy laminar supersonic flow in the shock tube. The variation of the local heat transfer rate, divided by the equivalent attached heat transfer rate, behind the separation point is presented at various flow conditions. Shown, also, are the variations of the maximum and average heat transfer rates as functions of Reynolds and shock Mach numbers. Local heat transfer rates are found to vary with distance behind the step and to depend on the combination of Reynolds and shock Mach numbers. The heat transfer rate increases rapidly in the reattachment region and then decreases a little in the attached flow. Both the separation minimum heat transfer rate and the reattachment peak value increase when the Reynolds number is increased and Mach number decreased simultaneously. Peak values from 0.6 to 4 times the equivalent attached values are measured. (Author).
Author : Josef Rom
Publisher :
ISBN 13 :
Total Pages : 30 pages
Book Rating : 4.:/5 (227 download)
Download or read book Base Pressure Behind Two-dimensional and Axially Symmetric Backward Facing Steps in a Turbulent Supersonic Flow written by Josef Rom and published by . This book was released on 1963 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: The pressure behind a two-dimensional step in supersonic turbulent flow is calculated by the use of the Crocco-Lees momentum integral method. However, instead of assuming a constant mixing rate of k=0.03, it is assumed that C, the average value of turbulent mixing rate correlation function between separation and shock impingement positions, is constant. This assumption considers the turbulent mixing to be similar, in general, to the laminar case except for the much higher mixing rate. The assumption of C, as constant leads to a similarity parameter for the pressure behing a two-dimensional step equal to Re sub L to the minus 3/5 power times h/l. Pressure distribution behind two-dimensional steps is measured at Mach number of 2.25 and Reynolds numbers between 0.35 to 5x Re sub L to the minus 3/5 power times h/l. Good agreement is found between the analytical calculations and the experimental data as well as other published experimental data. Pressure distribution behind axially-symmetric backward facing steps is measured at Mach number 2.25 and Reynolds numbers of 3 to 10 to the 6th power. It is shown that the flow around the axially-symmetric step is similar to that about a free base and is the correlated using the parameter Re sub L to the minus 1/5 power times h/l. Comparison is presented also with published data and good agreement is found. (Author).
Author : Jean J. Ginoux
Publisher :
ISBN 13 :
Total Pages : 774 pages
Book Rating : 4.3/5 (91 download)
Download or read book Laminar Separation in Supersonic Flow with Emphasis on Three-dimensional Perturbations at Reattachment written by Jean J. Ginoux and published by . This book was released on 1960 with total page 774 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : T. Arai
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (11 download)
Download or read book Turbulence Characteristics of Supersonic Boundary Layer Past a Backward Facing Step written by T. Arai and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Holger Babinsky
Publisher : Cambridge University Press
ISBN 13 : 1139498649
Total Pages : 481 pages
Book Rating : 4.1/5 (394 download)
Download or read book Shock Wave-Boundary-Layer Interactions written by Holger Babinsky and published by Cambridge University Press. This book was released on 2011-09-12 with total page 481 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
