Experimental and numerical flow field study of submerged translating impinging inclined water jets
S.V. Bult (TU Delft - Offshore and Dredging Engineering)
S. Tokgoz (TU Delft - Support Marine and Transport Techology)
S.M.S. Alhaddad (TU Delft - Offshore and Dredging Engineering)
R.L.J. Helmons (TU Delft - Offshore and Dredging Engineering)
G.H. Keetels (TU Delft - Offshore and Dredging Engineering)
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Abstract
This study investigates the influence of multiple jet parameters on the flow field of translating impinging inclined water jets. We conducted full-scale stereoscopic particle image velocimetry and pressure measurements and three-dimensional computational fluid dynamics simulations for Reynolds numbers in the range of. Considering the complex mechanism of a translating impinging jet, a good concordance is observed between the experimental and numerical results. The translation-to-jet velocity ratio is identified as a critical parameter in determining whether the jet flow predominantly exhibits impinging characteristics or behaves as a jet in cross-flow. It is found that, for, jet impingement is minimal. The stand-off distance to nozzle diameter ratio determines the relative influence of the cross-flow on the jet flow. The effect of is similar to a stationary impinging jet, with the potential core extending up to, but entrainment is enhanced by the relative cross-flow. For an inclined jet, i.e. jet angle, the direction of the jet, either backward or forward, governs the deflection of the flow. Higher pressures are recorded for a backward directed jet compared with a forward directed jet for supplementary angles.
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