Propeller design has evolved significantly in last years, with the introduction of numerical methods which can provide a very reliable assessment of propeller characteristics, not only in correspondence to the usual design conditions, but also to off-design conditions. Nevertheless, problems still exist if “very off-design conditions” are considered, and if interest is posed on cavitation related problems such as radiated noise. Interest in radiated noise phenomenon is constantly increasing, not involving anymore only naval vessels, but affecting also design of other “high added value ships”, such as cruise ships and megayachts, for which comfort problem and environmental impact are a key element. One of the most significant problems related to radiated noise, is the rather low amount of experimental data available, and this is particularly significant for CPP propellers at off design conditions. In present paper, the experimental characterization of two alternative designs of a CP propeller in terms of usual mechanical characteristic, cavitation and radiated noise is presented. Experimental campaign has been conducted considering two very different pitch settings, allowing to analyse propeller behaviour also in correspondence to very off design conditions.
Experimental characterization of two CP propellers at different pitch settings, considering cavitating behaviour and related noise phenomena
SAVIO, LUCA;VIVIANI, MICHELE
2011-01-01
Abstract
Propeller design has evolved significantly in last years, with the introduction of numerical methods which can provide a very reliable assessment of propeller characteristics, not only in correspondence to the usual design conditions, but also to off-design conditions. Nevertheless, problems still exist if “very off-design conditions” are considered, and if interest is posed on cavitation related problems such as radiated noise. Interest in radiated noise phenomenon is constantly increasing, not involving anymore only naval vessels, but affecting also design of other “high added value ships”, such as cruise ships and megayachts, for which comfort problem and environmental impact are a key element. One of the most significant problems related to radiated noise, is the rather low amount of experimental data available, and this is particularly significant for CPP propellers at off design conditions. In present paper, the experimental characterization of two alternative designs of a CP propeller in terms of usual mechanical characteristic, cavitation and radiated noise is presented. Experimental campaign has been conducted considering two very different pitch settings, allowing to analyse propeller behaviour also in correspondence to very off design conditions.
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