Cavitation remains a persistent problem for internal flow devices due to both performance reduction and the ability of cavitation bubbles to cause significant component surface damage during bubble collapse. The focus of this study is the experimental characterization of cavitation in a sharp-edged orifice in presence of thermal effects, considering water at different temperatures and cryogenic fluid, in particular nitrogen. The flow is investigated by means of visual observations and pressure signals. By means of high-frequency response pressure transducers strategically placed in the orifice cavitation could be sensed by the correlation of the power spectrum of the pressure signal measured with a cavitation index.
An Experimental Investigations Of The Influence Of Thermal Effects On Inception Of Cavitation In Sharp-Edged Orifices
DE GIORGI, Maria Grazia;TARANTINO, MARCO;FICARELLA, Antonio
2009-01-01
Abstract
Cavitation remains a persistent problem for internal flow devices due to both performance reduction and the ability of cavitation bubbles to cause significant component surface damage during bubble collapse. The focus of this study is the experimental characterization of cavitation in a sharp-edged orifice in presence of thermal effects, considering water at different temperatures and cryogenic fluid, in particular nitrogen. The flow is investigated by means of visual observations and pressure signals. By means of high-frequency response pressure transducers strategically placed in the orifice cavitation could be sensed by the correlation of the power spectrum of the pressure signal measured with a cavitation index.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
