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Developing flow in s-shaped ducts. 1: square cross-section duct
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Taylor, A. M. K. P. Yianneskis, M. Whitelaw, J. H. |
| Copyright Year | 1982 |
| Description | Laser-Doppler velocimetry was used to measure the laminar and turbulent flow in an S-duct formed with two 22.5 deg sectors of a bend with ratio of mean radius of curvature to hydraulic diameter of 7.0. The boundary layers at the inlet to the bend were about 25% and 15% of the hydraulic diameter for the laminar and turbulent flows, respectively. Pressure-driven secondary flows develop in the first half of the S-duct and persist into the second half but are largely reversed by the exit plane as a consequence of the change in the sense of curvature. There is, however, a region near the outer wall of the second bend where the redistribution of the streamwise isotachs results in a reinforcement of the secondary flow which was established in the first half of the S-duct. The net redistribution of the streamwise isotachs is comparable to that occurring in unidirectional bends of stronger curvature. The wall pressure distribution was also measured for the turbulent flow and quantifies the expected large variations in the longitudinal pressure gradient distributions which occur at different radial locations. |
| File Size | 3056162 |
| Page Count | 54 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19820016574 |
| Archival Resource Key | ark:/13960/t6n05zs61 |
| Language | English |
| Publisher Date | 1982-05-01 |
| Access Restriction | Open |
| Subject Keyword | Fluid Mechanics And Heat Transfer Ducted Flow Turbulent Flow Laser Doppler Velocimeters Laminar Flow Vortices Flow Visualization Flow Velocity Duct Geometry Secondary Flow S Curves 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 |
