by National Aeronautics and Space Administration, Langley Research Center, Available from NASA Center for AeroSpace Information in Hampton, Va, Linthicum Heights, MD .
Written in English
|Statement||M.N. Kogan and M.V. Ustinov.|
|Series||NASA/CR -- 97-206273, NASA contractor report -- NASA CR-97-206273.|
|Contributions||Ustinov, M. V., T︠S︡entralʹnyĭ aėrogidrodinamicheskiĭ institut imeni prof. N.E. Zhukovskogo., Langley Research Center.|
|The Physical Object|
|Pagination||44 p. :|
|Number of Pages||44|
Receptivity of Flat-Plate Boundary Layer in a Non-Uniform Free Stream (Vorticity Normal to the Plate) Work is devoted to study of free-stream vorticity normal to leading edge interaction with boundary layer over plate and resulting flow distortion influence on laminar-turbulent transition. In experiments made the wake behind the vertically Author: M. N. Kogan and M. V. Ustinov. A localized disturbance was introduced into the free stream from a small pipe located upstream of the leading edge of a flat plate. The disturbance penetrated the boundary layer, and a so called boundary layer ‘puff’ was created, consisting of three longitudinal streaks with the maximum perturbation amplitude approximately in the middle of the boundary by: 7. The non-uniform flow was produced by laminar or turbulent wakes behind a wire placed normal to the plate upstream of the leading edge. The theoretical part of the work is devoted to studying the unstable disturbance evolution in a boundary layer with strongly non-uniform velocity profiles similar to that produced by outer-flow : M. N. Kogan. The receptivity of a flat plate boundary layer to a freestream axial vortex is discussed by Boiko . Zhong  investigated the leading-edge receptivity to freestream disturbance waves for.
The results show that the receptivity of the flat-plate boundary layer to free-stream fast acoustic waves leads to the excitation of both Mack modes and a family of stable modes, i.e. mode I, mode II, etc. It is found that the forcing fast acoustic waves do not interact directly with the unstable Mack by: The receptivity of the boundary layer on a straight-wing model to controlled free stream disturbances is studied. The disturbances are generated by a special source located upstream of the leading edge of the model. The measurements show that perturbations with a streamwise-extended structure arise in the boundary by: 2. The receptivity of hypersonic boundary layers to free-stream disturbances, which is the process of environmental disturbances initially entering the boundary layers and generating disturbance waves, is altered considerably by the presence . Receptivity of supersonic boundary layer to acoustic disturbances interacting with a blunt leading edge of a flat plate is studied using a combined asymptotic and numerical approach.
Get this from a library! Receptivity of flat-plate boundary layer in a non-uniform free stream (vorticity normal to the plate): final report. [M N Kogan; Langley Research Center.;]. Receptivity of flat-plate boundary layer in a non-uniform free stream (vorticity normal to the plate): final report of TsAGI under cooperative agreement # NCCW a subsonic boundary layer to a free stream acoustic perturbation. The heights of the roughnesses involved in the receptivity study are usually assumed to have a size much smaller than the boundary layer thickness in order to cause only a small distortion. Receptivity of Flat-Plate Boundary Layer in a Non-Uniform Free Stream (Vorticity Normal to the Plate) by National Aeronautics and Space Administration NASA Kindle.