Particle Image Velocimetry Dynamic Analysis on the Penstock Vortex Flow for the Dam Reliability Study

Zahari, Nazirul Mubin; Zawawi, Mohd Hafiz; Ng, Fei Chong; Sidek, Lariyah Mohd; Abas, Aizat; Nurhikmah, F.; Aziz, Nurhanani A.; Hao, Tung Lun; Radzi, M. R. M.

doi:10.1007/978-981-16-6978-1_38

Cited by 1 publication

(1 citation statement)

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“…Based on the vortices' intensity and growth, different categories were created. Some researchers have expanded this classification to include VT0 (i.e., no activity at this stage) [5][6][7]. Flow separation as well as eddy formation, asymmetrical approach conditions, a lack of critical submergence, an approach flow velocity higher exceeding 0.65 m/s, and an abrupt shift in flow direction are the leading factors [8].…”

Section: Introductionmentioning

confidence: 99%

Free-Surface Vortices Mitigation using Anti-Vortex Plates in Dam Intakes through CFD

Manogaran

Zainol

Wahab

et al. 2023

CFDL

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By recording parameters such as velocity and volume fraction by contour plots or plane, a CFD model enables to analyse flow patterns in the model, such as free-surface vortices A free-surface vortex, a common problem may indeed be observed in a variety of submerged water intakes, notably shallow basins and low head intakes. These FSVs are likely to form an air-core vortex, eventually entrapping detritus and air pockets in the water intake system and causing further vibration and damage to the downstream turbine. When paired with a high velocity, the formation of vortices in the system been known to produce hydraulic transients, which cause unwanted operation or pressure changes. The model of the 1:100 scale dam reservoir was generated, computationally meshed, and modelled in FLUENT under ANSYS 2019 R3 at two different water levels to observe the FSV formations. To mitigate those FSV formations, anti-vortex plates with two distinct plates—square and wedge—were used. From the findings square plates outperform wedge plates because square it lowers the speed of a fast-flowing fluid and reduces it into a laminar flow rather of a turbulent flow, which benefits vortex class deterioration. Data from the simulation and experimental shows a strong agreement in terms of velocity at outlet 1 from both water levels with relative errors of 3.0% and 14.1% respectively

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