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https://hdl.handle.net/11681/37096| Title: | Quantification of the flow field around a draghead using a physical model |
| Authors: | Bryant, Duncan B. McFall, Brian C. Randall, Robert E., 1940- Zhi, Yuanzhe. Welp, Timothy L. Smith, David L. |
| Keywords: | Dredges Dredging Fluid dynamics Hydraulic measurements Wakes (Fluid dynamics) |
| Publisher: | Coastal and Hydraulics Laboratory (U.S.) Environmental Laboratory (U.S.) Engineer Research and Development Center (U.S.) |
| Series/Report no.: | Technical Report (Engineer Research and Development Center (U.S.)) ; no. ERDC TR-20-10 |
| Abstract: | This study quantifies the hydraulic flow field around a draghead using a 1:7 scaled California and general type draghead. The flow field velocity measurements were taken with each draghead stationary and moving with a prototype speed of 2 knots. The measured velocities increased proportionally with the pumping flow rate. Measured velocities were found to be inversely proportional to the distance from the draghead. As a result, the greatest entrainment velocities for the California draghead were measured between the two visors and below the visors. The entrainment velocities laterally of the dragheads were found to increase by a factor of 2 with the addition of either a concrete or sand bed below the draghead. The measured velocities changed dramatically when the draghead was moving with a prototype speed of 2 knots. The measurement locations to the side of the dragheads did not show the presence of fluid entrainment; instead, the velocities were dominated by the forward motion and subsequent generation of a shear layer around the draghead. The velocities behind the draghead indicated the presence of a wake behind the draghead, with the fluid moving forward at velocity equivalent to or greater than the forward translation speed. |
| Description: | Technical Report |
| Gov't Doc #: | ERDC TR-20-10 |
| Rights: | Approved for Public Release; Distribution is Unlimited |
| URI: | https://hdl.handle.net/11681/37096 http://dx.doi.org/10.21079/11681/37096 |
| Size: | 100 pages / 3.44 MB |
| Types of Materials: | PDF/A |
| Appears in Collections: | Technical Report |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| ERDC TR-20-10.pdf | 3.44 MB | Adobe PDF |  View/Open |