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Measurements of laminar and turbulent flow in a curved duct with thin inlet boundary layers
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Taylor, A. M. K. P. Yianneskis, M. Whitelaw, J. H. |
| Copyright Year | 1981 |
| Description | Laser Doppler velocimetry was used to measure the laminar and turbulent flow in a 90 deg square bend of strong curvature. The boundary layers at the inlet to the bend were approximately 25 percent and 15 percent of the hydraulic diameter for the laminar and turbulent flows, respectively. The development of the pressure driven secondary motion is more rapid for laminar flow: the maximum cross stream component measured was 60 percent of the bulk velocity in contrast to 40 percent for turbulent flow. The streamwise isotachs show that, for laminar flow, large velocities are found progressively nearer to the outer radius of the bend and along the sidewalls. For turbulent flow, the isotachs move towards the inner radius until about 60 deg around the bend where strong secondary motion results in a similar redistribution. Turbulence level and shear stress measurements are also presented. |
| File Size | 2085152 |
| Page Count | 61 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19810007898 |
| Archival Resource Key | ark:/13960/t1vf1nj0q |
| Language | English |
| Publisher Date | 1981-01-01 |
| Access Restriction | Open |
| Subject Keyword | Fluid Mechanics And Heat Transfer Tables Data Turbulence Turbulent Flow Laser Doppler Velocimeters Laminar Flow Flow Measurement Shear Stress Intake Systems Duct Geometry Secondary Flow Curvature Boundary Layers 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 |
