水下航行体降噪艉翼填角的数值模拟与试验研究

为降低水下航行体噪声,研究了艉翼填角的降噪效果。分析了水下航行体艉翼接合部马蹄涡影响螺旋桨伴流场的特征,认为马蹄涡对水下航行体噪声产生了不利影响。针对某无人水下航行体(UUV)设计了一种艉翼填角,运用CFD方法对该艉翼填角优化螺旋桨伴流场的效果进行了数值模拟,结果显示伴流场轴向速度的周向不均匀度系数下降35%-62%。将艉翼填角应用于该UUV,开展航行辐射噪声测量试验,结果显示艉翼填角使UUV航行噪声总声源级降低3.4 d B,尤其对低频噪声抑制较好。

Experiment and numerical simulation of denoising fillets of stern appendages on underwater vehicle

To reduce the noise of underwater vehicle, denoising fillets of stern appendages are investigated. The effect of the horseshoe vortexes generated at body-appendage junctions on the underwater vehicle wake is analyzed, and these horseshoe vortexes may exert adverse effects on the noise of underwater vehicle. A type of fillets of stern appendages adapted for an unmanned underwater vehicle (UUV) is designed. Its ef-fect on wake optimization is numerically simulated by Computational Fluid Dynamics (CFD) method. The results show that the circumferential non-uniformity of axial velocity at propeller disc is reduced by 35%-62%. To test the denoising performance of fillets of stern appendages, the noise of a voyaging underwater vehicle is measured. The results show that the overall sound source level of UUV noise is reduced by 3.4 dB when fillets of stern appendages are added. At low frequencies, its denoising performance is better.