contributor author | M. V. Finnis | |
contributor author | A. Brown | |
date accessioned | 2017-05-08T23:52:03Z | |
date available | 2017-05-08T23:52:03Z | |
date copyright | January, 1996 | |
date issued | 1996 | |
identifier issn | 0889-504X | |
identifier other | JOTUEI-28648#162_1.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl/handle/yetl/117905 | |
description abstract | Measurements are presented of the streamwise velocity variation within a laminar boundary layer on a concave surface of 4 m radius of curvature for which the free-stream velocity gradient factor (ν/U0 2 )dU0 /dx was approximately 1 × 10−6 . The stream velocity variation was consistent with the presence of counterrotating vortices resulting from the Görtler instability. The vortices exhibited exponential growth over the streamwise extent of the measurements to a disturbance amplitude of approximately 13 percent of the local free-stream velocity. The vortex growth rates were found to be less than those for a zero velocity gradient factor, indicating that a favorable pressure gradient stabilizes the flow with respect to the Görtler instability. Boundary layer profiles at local upwash and downwash positions are compared with the linear theory for which the mean flow was modeled using the Pohlhausen approximation to the solution of the boundary layer equations. The agreement between the measured and predicted profiles indicates that the linear stability theory can provide a fair approximation to the small amplitude growth of the Görtler instability. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Darryl E. Metzger Memorial Session Paper: The Streamwise Development of Görtler Vortices in a Favorable Pressure Gradient | |
type | Journal Paper | |
journal volume | 118 | |
journal issue | 1 | |
journal title | Journal of Turbomachinery | |
identifier doi | 10.1115/1.2836597 | |
journal fristpage | 162 | |
journal lastpage | 171 | |
identifier eissn | 1528-8900 | |
keywords | Vortices | |
keywords | Pressure gradient | |
keywords | Boundary layers | |
keywords | Flow (Dynamics) | |
keywords | Measurement | |
keywords | Gradients | |
keywords | Approximation | |
keywords | Equations AND Stability | |
tree | Journal of Turbomachinery:;1996:;volume( 118 ):;issue: 001 | |
contenttype | Fulltext | |