Titel van de presentatie

Physical model Influence of breaking logs on flow patterns induced by lock filling with gate openingsVerelst, K.(1); Vercruysse, J.(1); Ramos, P.(2)05/10/2015Belgian Hydraulics Day - FHR(1)(2)

OutlineAim of the researchProject descriptionPhysical modelMeasurements

Aim of the researchDesign of filling/emptying system of lock

Construction costs

Aim of the researchFilling emptying systems with gate openings : Limiting forces on ship can be achieved by: (Design of locks)Spreading the flow along width of lock chamber Generating turbulence to break down energy of filling jetsDirecting the flow along lock axis Generating turbulence: dutch literature advises breaking logs

Evergem (BE)

Oranje lock Amsterdam (NL)

Aim of the researchResearch questions concerning breaking logs:Influence of breaking logs on current pattern, discharge coefficient, Shape of breaking logDesign of breaking logsDutch design guidelines: Surface breaking logs > 50% of surface gate openingDistance between breaking logs > 0.30 m ! contradictoryGain knowledge on flow through gate openings design software, e.g. vul_sluis, LOCKFILL

Project descriptionTask order 1: Measurements on physical model (March - Oktober 2015)Hydraulics Laboratory Ghent UniversityTask order 2: CFD modeling with OpenFOAM (starting 12/10/2015)IMDC nv

Physical modelGeneral physical model Not scaled version of existing lock/existing designDesign based on dimensionless comparison of F/E systems of recent studied locksOne opening in lock gate 200 mmLock gate perpendicular to lock

UpstreamDownstream2 m4 m

Physical modelOpening in lock gate: Standard geometry based on design of lock of Sint-Baafs-VijveUpstream: circular tube 200 mmDownstream: Rectangular section W=278 mm H=242 mm3 breaking logs tubular shape, W = 22 mm

Physical model testsPosition of breaking logsNo breaking logsBreaking logs inside/outside the lock gateHorizontal/vertical position breaking logsShape of breaking logTubular profile I-profile (planned)Number of breaking logs (2, 3, 4, 5) and distance between breaking logs (planned)(planned) tests with alternative configuration of opening in lock gate: circular opening, without circular tube, with guiding vanes(designed together with department for design of lock gates)

MeasurementsDischarge through opening Water level in upstream and downstream reservoirVelocity in lock chamber downstream of openingVectrino profilerSemi-automatic measuring robot Water level depression above the jet

MeasurementsVisualisation flow pattern in lock chamber:6 video cameras: 3 side and 3 above modelBacklights, with diffusion foilDye: Potassium PermanganateVisualisation flow pattern in lock gate between lifting gate and breaking logs

Results

No breaking logsHdownstr= 1.00 mHupstr= 1.30 m(vertical) Breaking logs outside lock gateHdownstr= 1.00 mHupstr= 1.20 m

Results

(vertical) Breaking logs outside lock gateHdownstr= 1.00 mHupstr= 1.20 m

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