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|Title:||Quantification of the flow field around a draghead using a physical model|
|Authors:||Bryant, Duncan B.|
McFall, Brian C.
Randall, Robert E., 1940-
Welp, Timothy L.
Smith, David L.
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.|
|Gov't Doc #:||ERDC TR-20-10|
|Appears in Collections:||Documents|