Please use this identifier to cite or link to this item: 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
URI: https://hdl.handle.net/11681/37096
http://dx.doi.org/10.21079/11681/37096
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