【摘要】 将黏性多相流理论的数值方法和球形空泡辐射噪声理论相结合,进行了非均匀入流条件下螺旋桨片空化的周期形态模拟以及螺旋桨空化单极子声源辐射噪声数值预报。采用流场数值模拟方法和声场边界元数值声学方法耦合的方法,在频域上预报非均匀入流下空化和非空化条件下螺旋桨负载噪声;通过数值预报负载噪声得到非空化条件下螺旋桨噪声,将片空化单极子声源辐射噪声和空化的负载噪声在频域上进行相加得到空化条件下的螺旋桨噪声。采用某民船桨模验证了非均匀入流下螺旋桨片空化周期形态以及空化单极子声源辐射噪声预报的准确性,然后分析了民船桨在空化和非空化条件下螺旋桨噪声的叶频和二倍叶频特征。结果表明,上述方法能有效地预报螺旋桨空化和非空化噪声的叶频特征。更多还原

【Abstract】 By using a hybrid algorithm of combining the numerical method based on the viscous multiphase theory with the pulsating spherical bubble radiated noise theory,the simulation of the propeller transient cavitating pattern and the prediction of the monopole radiation noise under a non-uniform inflow were conducted.Through using the coupling of the numerical simulation method for flow fields with the acoustic boundary element method for sound fields,the propeller loading noise in non-uniform inflow under the condition of cavitation and non-cavitation was predicted in the frequency domain.The propeller loading noise under non-cavitating was obtained through numerical prediction of loading noise,and the propeller noise under cavitating was obtained by adding up the cavitating monopole radiation noise and the cavitating loading noise in the frequency domain.The propeller cavitating pattern under nonuniform inflow and the accuracy of predicting the monopole radiation noise under non-uniform inflow were verified by using a private propeller.Then,the features of the blade passing frequency(BPF) and the 2BPF of the private propeller’ s noise under cavitating and non-cavitating were investigated,and the results showed the above-mentioned method could effectively predict the BPF features of propellers’ cavitating noise and non-cavitating noise.更多还原