Author: R. Sedney
Publisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 38

Get Book Here

Book Description

Author: Raymond Sedney
Publisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 56

Get Book Here

Book Description
The primary purpose of this report is to survey the available information mainly experimental, on the subject. Most attention is given to the complex flow field resulting when a 3-D protuberance is introduced into a laminar boundary layer; less can be said about the turbulent case or 2-D protuberances because enough detailed, careful experiments have not been made. There are some features of the induced flow fields common to all speed ranges; applications range from flow in the atmospheric boundary layer to hypersonic vehicle problems. Some attempts to analyze the downstream flow are also summarized.

Author: Steven Philip Schneider
Publisher:
ISBN:
Category : Electronic dissertations
Languages : en
Pages : 374

Get Book Here

Book Description

Author: Raymond Sedney
Publisher:
ISBN:
Category :
Languages : en
Pages : 54

Get Book Here

Book Description
The study of three-dimensional boundary layers is synonymous with the study of cross flow or streamwise vorticity in the boundary layer. The research is concerned with the initial value problem for the 3-D boundary layer equations. Results are reported on exact solutions for the decay of streamwise vorticity, on a combined oil-flow--optical method of visualizing the surface flow field in the presence of 3D protuberances, and nonuniform behavior of the small crossflow approximation.

Author: Raymond Sedney
Publisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 26

Get Book Here

Book Description
Three-dimensional perturbations on two-dimensional boundary layer flows are considered. First initially induced perturbations are studied and a general solution obtained. Second a specific externally induced perturbation is discussed. In both the streamwise velocity perturbation becomes infinite but the cross flow decays as downstream infinity is approached. This implies that the small cross flow approximation is a singular perturbation. The basis for this lies in the fact that the nature of the equations is changed by the approximation, viz., the zone of dependence property is lost.

Author: Jean Ginoux
Publisher:
ISBN:
Category : Aerodynamics, Supersonic
Languages : en
Pages : 17

Get Book Here

Book Description

Author: Jean Ginoux
Publisher:
ISBN:
Category :
Languages : en
Pages : 17

Get Book Here

Book Description

Author: Henry Görtler
Publisher:
ISBN:
Category : Boundary layer
Languages : en
Pages : 40

Get Book Here

Book Description
A study is made of the stability of laminar boundary-layer profiles on slightly curved walls relative to small disturbances that result from vortices whose axes are parallel to the principal direction of flow. The result is an eigenvalue problem by which, for a given undisturbed flow at a prescribed wall, the amplification or decay is computed for each Reynolds number and each vortex thickness. For neutral disturbances (zero amplification) a critical Reynolds number is determined for each vortex distribution. The numerical calculation produces amplified disturbances on concave walls only.

Author: Eli Reshotko
Publisher:
ISBN:
Category : Aerodynamics
Languages : en
Pages : 48

Get Book Here

Book Description

Author: Stefan Braun
Publisher:
ISBN:
Category :
Languages : en
Pages :

Get Book Here

Book Description