研究流噪声与航速关系可以有效地解决高航速水下航行器流噪声预报的难题.基于Lighthill声类比理论,研究缩尺比为1:24的SUBOFF模型在特定航速范围内的声源特性,得到了流噪声频域结果与航速关系,给出了不同航速下基于斯特劳哈尔数和航速关系的流噪声频谱换算方法.研究结果表明,随着航速的提高,SUB-OFF声指向性形状基本不变,低频范围内声辐射具有偶极子特性,辐射声功率的大小与航速的6次方成正比.在同一流场模型下,基于偶极子换算关系下的高航速原型预报值和大涡模拟计算值总声功率级和总声源级误差分别为1.2 dB 和 2.3 dB.
Research on spectral similarity law of SUBOFF's flow-induced noise at different speeds
Studying the relationship between flow-induced noise and speed can effectively solve the difficult problem of predicting flow-induced noise of high-speed underwater vehicles.Sound source characteristics of the 1:24 SUBOFF mod-el in the specific speed range were studied based on the Lighthill's acoustic analogy theory,the relationship between the fre-quency domain results of its flow-induced noise and the speed were obtained,and the frequency conversion method of flow noise based on the relationship between Strouhal number and speed at different speeds are given.The results show that the shape of SUBOFF sound field directivity is basically unchanged with the increase of speed,the sound radiation in the low frequency range has dipole characteristics,and the radiated sound power is proportional to the sixth power of the speed.Un-der the same flow field model,the errors of the total sound power level and the total sound source level of the high speed prototype prediction value and the large eddy simulation(LES)calculation value based on the dipole conversion relationship are 1.2 dB and 2.3 dB,respectively.
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