Experiments have been carried out at CNR-INSEAN where the drag reduction due to a riblet structured film was measured on a submerged body model. The standard finishing used by INSEAN for its models was used as baseline. A different behavior depending on the speed was expected, because the necessary riblet sizes for effective drag reduction depend on the temperature, pressure and velocity of the medium. The results indicate that the riblets offer an overall improvement in skin drag characteristics, but with different amounts throughout the speed range. The observed frictional resistance reduction is of about 1% at the lower speeds up to a maximum of 4.0% for the highest speed. This corresponds to a total resistance reduction of 0.7 to 2.7% respectively.
Model Resistance Tests of a submerged body, C2586_01CT14 RAP01 - Tests No. 1 - 8
Marco Masia;Fabio Carta;Antonio Camassa;Alessandro Piazza;Giovanni Coppola;Roberto Basti;Flavio Olivieri;Fiorello Cutini Calisti;Alberto Ugolini;Andrea Mancini;Veraldo Maggi;
2014
Abstract
Experiments have been carried out at CNR-INSEAN where the drag reduction due to a riblet structured film was measured on a submerged body model. The standard finishing used by INSEAN for its models was used as baseline. A different behavior depending on the speed was expected, because the necessary riblet sizes for effective drag reduction depend on the temperature, pressure and velocity of the medium. The results indicate that the riblets offer an overall improvement in skin drag characteristics, but with different amounts throughout the speed range. The observed frictional resistance reduction is of about 1% at the lower speeds up to a maximum of 4.0% for the highest speed. This corresponds to a total resistance reduction of 0.7 to 2.7% respectively.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
