Development of Marine Propellers with Better Cavitation Performance-2-Effect of design lift coefficient for propellers with flat pressure distribution〔含討論〕

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A new propeller design method to obtain the blade section shapes by prescribing pressure distribution is developed, combining a 2-dimensional foil design theory with a propeller lifting surface one. In this method, new blade sections can be designed in accordance with the va-riation of the section lift coefficient C_L in a given wake. Three propellers with flat pressure distribution which was proved effective to reduce cavity volume and pressure fluctuations in previous papers are newly designed, changing the design C_L. A propeller with the lowest design C_L has flat pressure distribution in the mean wake. A propeller with the highest design C_L has the least face cavitation margin which is almost same as that of a MAU type propeller used for comparison. The remaining one has the middle design C_L between those of the above two propellers. Using these new and MAU type propellers, the effect of the design C_L Was experimentally investigated. The main results obtained are as follows : (1) For increasing the propeller open efficiency and reducing the cavity volume and cavi-tation noise, the highest design C_L was most effective, showing 4.5% higher efaciency and about 10dB lower noise in the frequency range of 10 to 100 kHZ than the MAU type one. The noise reduction is considered due to the decrease in the cavity volume which is amount of the cavity collapsing in each propeller revolution. (2) For reducing the pressure fluctuations, the middle design C_L Was most effective, showing about 0.8 times the fluctuating pressure amplitude due to the MAU type one at both the first and second blade frequencies. This result is considered due to the reduction of cavity volume variation.
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Development of Marine Propellers with Better Cavitation Performance-2-Effect of design lift coefficient for propellers with flat pressure distribution〔含討論〕

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Development of Marine Propellers with Better Cavitation Performance-2-Effect of design lift coefficient for propellers with flat pressure distribution〔含 討論〕

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Development of Marine Propellers with Better Cavitation Performance-2-Effect of design lift coefficient for propellers with flat pressure distribution〔含討論〕