﻿ 螺旋桨非空泡噪声数值计算方法研究
 舰船科学技术  2016, Vol. 38 Issue (5): 21-25 PDF

Numeric simulation of non-cavatation propeller noise
ZHANG Cheng, ZHANG Dahai, WEI Qiang
China Ship Development and Design Center, Wuhan 430064, China
Abstract: Non-cavitation noise of properller is numerically investigated. The main purpose is to analyze non-cavitation noise in various operating conditions with diferent congurations. The technology roadmap of this research as follow. The First step is establishment of flowing and acoustic model. The second step is caculating the flow field information. The third step is to get the properller information of stress tensor and velocity by ICFD software, get the time-domain acoustic information of the properller equi-acoustic source by Light-Hill theory, get the frequency information of properller equi-acoustic source by FFT. The fourth step is calculation the three-dimensional contour of the acoustic model and the frequency spectrum of different test field point. The last step is comparing the results of the calculation and model test.
Key words: properller     non-cavitation noise     acoustic analogy     directivity
0 引言

1 基本理论

 $\frac{1}{a_{0}^{2}}\frac{{{\partial }^{2}}\rho '}{\partial {{t}^{2}}}-{{\nabla }^{2}}\rho \text{ }\!\!'\!\!\text{ }=0,$ (1)

 \begin{align} & \frac{\partial \rho }{\partial \tau }+\frac{\partial \rho u{{\text{ }\!\!'\!\!\text{ }}_{i}}}{\partial y{{'}_{i}}}=0, \\ & \frac{\partial \rho u{{\text{ }\!\!'\!\!\text{ }}_{i}}}{\partial \tau }+\frac{\partial \rho u{{\text{ }\!\!'\!\!\text{ }}_{i}}u{{\text{ }\!\!'\!\!\text{ }}_{j}}}{\partial y{{'}_{i}}}=\frac{\partial \rho }{\partial y{{'}_{i}}}+\frac{\partial {{e}_{ij}}}{\partial y{{'}_{j}}}, \\ \end{align} (2)

 $\frac{{{\partial }^{2}}\rho '}{\partial {{t}^{2}}}-a_{0}^{2}{{\nabla }^{2}}\rho \text{ }\!\!'\!\!\text{ }=\frac{\partial {{T}_{ij}}}{\partial {{x}_{i}}\partial {{x}_{j}}}\text{。}$ (3)

2 预报模型 2.1 流场计算模型

1）来流入口到螺旋桨距离 L1 ≥ 2 d

2）模型直径 D1 ≥ 6 d

3）模型流场出口距螺旋桨距离 L2 ≥ 5 d

4）设置专门的螺旋桨旋转区，该区域紧贴螺旋桨旋转区域建立，各表面与螺旋桨桨叶之间距离 0.1 d ≥ △d ≥ 0.05 d

 图 1 流场计算区域划分 Fig. 1 The flow field count area is divided

2.2 声学计算模型

 图 2 声学计算区域划分 Fig. 2 The acoustics count area is divided

2.3 流场计算

 图 3 计算网格模型 Fig. 3 Calculation grid pattern

 图 4 螺旋桨流场 Fig. 4 Propeller neighbouring flow field
2.4 声学计算

 图 5 两种边界声压级频谱对比 Fig. 5 Sound pressure level frequency notes comparing for tow boundary condition
2.5 远场声辐射特性

 图 6 远场声辐射计算模型 Fig. 6 Distance field radiation of sound computation module computational mode

 图 7 声压分布指向性云图 Fig. 7 Sound pressure distribution directivity cloud chart

 图 8 螺旋桨噪声指向性 Fig. 8 The propeller noise directivity

3 计算精度

 图 9 数值预报结果与试验数据对比 Fig. 9 The numeric predictet data compares against the test
4 结语

1）对于五叶桨，其低频噪声指向性呈对称性分布，轴向最大，盘面方向最小；

2）中频段噪声指向性呈非对称分布，在迎流方向声压值小，被流方向声压值最大；

3）高频段噪声分布无明显规律，呈放射状分布；

4）在 1～12.5 kHz 范围内，计算值与试验值在各频率处声压级误差最大 7.56%，最小 0.89%，计算频段内总声级计算值与试验值误差小于 2 dB。

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