Heat Transfer in the Laminar Supersonic Separated Flow Behind an Axisymmetrical Backward Facing Step PDF Download
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Author: Josef Rom
Publisher:
ISBN:
Category :
Languages : en
Pages : 55
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Book Description
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:
Category :
Languages : en
Pages : 55
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Book Description
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: Jean J. Ginoux
Publisher:
ISBN:
Category : Aerodynamics, Supersonic
Languages : en
Pages : 774
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Book Description
Author: Donald R. Crawford
Publisher:
ISBN:
Category :
Languages : en
Pages : 166
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Book Description
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:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 1460
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: United States. Air Force. Office of Aerospace Research
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 550
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Author: N. Curle
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ISBN:
Category :
Languages : en
Pages :
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Author: Eric Loth
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Category :
Languages : en
Pages :
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Author:
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ISBN:
Category :
Languages : en
Pages : 42
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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: Jean J. Ginoux
Publisher:
ISBN:
Category : Aerodynamics, Supersonic
Languages : en
Pages : 68
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Author: Odus R. Burggraf
Publisher:
ISBN:
Category :
Languages : en
Pages : 56
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Book Description
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).
