Prediction of the Unsteady Performance of Contra-Rotating Propellers by Lifting-Surface Theory〔含討論〕

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In this paper, a numerical method based on the lifting surface theory is presented for predicting the unsteady performance of contra-rotating propellers operating in uniform or non-uniform inflows and at equal or unequal rates of revolution. The vortex lattice method is employed to calculate the loading on propeller blades. The existence of the boss is neglected. The trailing vortex wake model proposed by the authors previously for predicting the steady performance of contra-rotating propellers is used in the present unsteady performance calculations. The trailing vortex interactions between the forward and aft propellers are taken into account in the wake model. Based on the present method, a computer program has been developed. Numerical calculations are performed for several sets of contra-rotating propellers. The predicted frequencies of bearing forces due to the interactions between contra-rotating propellers agree perfectly with theoretical results. Regarding the amplitudes of bearing forces, the correlation between the present results and available experimental data is satisfactory. Based on the present numerical results, discussions are also made on the characteristics of bearing forces when contra-rotating propellers operate in non-uniform inflows and at equal and unequal rates of revolution.
社団法人日本船舶海洋工学会の論文
1992-03-29