Loading...
Please wait, while we are loading the content...
Similar Documents
Measurements in transitional boundary layers under high free-stream turbulence and strong acceleration conditions
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Volino, Ralph J. Simon, Terrence W. |
| Copyright Year | 1995 |
| Description | Measurements from transitional, heated boundary layers along a concave-curved test wall are presented and discussed. A boundary layer subject to low free-stream turbulence intensity (FSTI), which contains stationary streamwise (Gortler) vortices, is documented. The low FSTI measurements are followed by measurements in boundary layers subject to high (initially 8%) free-stream turbulence intensity and moderate to strong streamwise acceleration. Conditions were chosen to simulate those present on the downstream half of the pressure side of a gas turbine airfoil. Mean flow characteristics as well as turbulence statistics, including the turbulent shear stress, turbulent heat flux, and turbulent Prandtl number, are documented. A technique called "octant analysis" is introduced and applied to several cases from the literature as well as to data from the present study. Spectral analysis was applied to describe the effects of turbulence scales of different sizes during transition. To the authors'knowledge, this is the first detailed documentation of boundary layer transition under such high free-stream turbulence conditions. |
| File Size | 19177022 |
| Page Count | 662 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19980003835 |
| Archival Resource Key | ark:/13960/t7np70k8n |
| Language | English |
| Publisher Date | 1995-10-01 |
| Access Restriction | Open |
| Subject Keyword | Fluid Mechanics And Heat Transfer Turbulent Heat Transfer Skin Friction Transfer Functions Flow Characteristics Airfoils Velocity Distribution Temperature Profiles Pressure Gradients Temperature Measurement Prandtl Number Vortices Spectrum Analysis Acceleration Physics Wind Tunnel Tests Shear Stress Boundary Layer Transition Turbulence Effects Free Flow Velocity Measurement Curvature Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
