The study on Interceptors performed last years at the Università degli Studi di Napoli "Federico II" shown the high potentiality of the unconventional device Double Interceptors System (DIS). This paper supplies data on the new tests carried out on prismatic models fitted with DIS and towed in still water and in regular waves. The experimentation has been performed on three model whose deadrise angles β are 10, 20 and 30 deg. The still water tests highlighted the effect of deadrise on the DIS efficiency and explained the cause of dynamic instability observed at high value of Fn∇. The data on the behaviour of the DIS in regular waves concern the early stage of a study currently in progress. The paper shows the mean values of RT measured, at Fn∇ =2.15, on β 20 model crossing regular waves with different frequencies and heights. Furthermore resistance variations, pitch, heave and vertical accelerations measured in two points are shown in time domain. The study confirmed that both in the sailing conditions, still and regular waves, the DIS provides great resistance reductions: up to 35% (β 10 deg, Fn∇ =2.25 - in still water) and 48% (β 20, Fn∇ =2.15 and high frequency of encounter - in regular waves).

Unconventional interceptors in still water and in regular waves: Experimental study on resistance reduction and dynamic instability / De Luca, F.; Pensa, C.. - 0:(2012).

Unconventional interceptors in still water and in regular waves: Experimental study on resistance reduction and dynamic instability

De Luca F.;Pensa C.
2012

Abstract

The study on Interceptors performed last years at the Università degli Studi di Napoli "Federico II" shown the high potentiality of the unconventional device Double Interceptors System (DIS). This paper supplies data on the new tests carried out on prismatic models fitted with DIS and towed in still water and in regular waves. The experimentation has been performed on three model whose deadrise angles β are 10, 20 and 30 deg. The still water tests highlighted the effect of deadrise on the DIS efficiency and explained the cause of dynamic instability observed at high value of Fn∇. The data on the behaviour of the DIS in regular waves concern the early stage of a study currently in progress. The paper shows the mean values of RT measured, at Fn∇ =2.15, on β 20 model crossing regular waves with different frequencies and heights. Furthermore resistance variations, pitch, heave and vertical accelerations measured in two points are shown in time domain. The study confirmed that both in the sailing conditions, still and regular waves, the DIS provides great resistance reductions: up to 35% (β 10 deg, Fn∇ =2.25 - in still water) and 48% (β 20, Fn∇ =2.15 and high frequency of encounter - in regular waves).
2012
Unconventional interceptors in still water and in regular waves: Experimental study on resistance reduction and dynamic instability / De Luca, F.; Pensa, C.. - 0:(2012).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/908055
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