水介质流噪声粘声分离计算方法研究

发布时间：2017-12-27 19:02

本文关键词：水介质流噪声粘声分离计算方法研究　出处：《中国舰船研究院》2015年硕士论文　论文类型：学位论文

【摘要】：在高航速下,流噪声成为影响潜艇隐蔽性的突出因素。准确评估潜艇流噪声性能,控制流噪声发生机制并展开相应的流噪声优化设计是未来潜艇设计的重要环节之一。本文以计算水动声学的理论和计算方法应用为研究对象。考虑了水和空气的物理特性的巨大差异,将计算气动声学的理论和算法成果运用到水动声学领域。首先,结合水介质状态方程,分别在直角坐标和曲线坐标下推导了适用于水介质流噪声的粘声分离计算方法的控制方程和离散格式;然后,通过水介质中旋转双涡发声、圆柱水声反射和圆柱涡声相互作用现象的典型算例计算,验证本文建立的粘声分离计算方法和自主编制的声场计算程序;最后,以圆柱绕流和空腔流动为简化的计算模型,应用大涡模拟/粘声分离的混合计算方法模拟流噪声的发生和传播过程,考察了两种情况下的流噪声发声机理和传播特性,并与大涡模拟/声类比方法进行了比较。分析结果表明,粘声分离计算方法用于分析水介质流噪声的产生和传播机理是有效的。在考察网格尺寸、时间步长、阻尼系数等因素对计算结果的影响后,本文采用的粘声分离计算方法和编制的声场计算程序取得了合理可信的计算结果。本文针对水介质可压缩性极弱、密度大、运动粘度小等物性特点和马赫数极低,雷诺数较高的流动特点,首次借鉴计算气动声学的方法,利用先进数值计算技术,建立了适用于水介质的流噪声计算方法。本文工作为开发水动力噪声估算软件、进行总体优化设计和水动力噪声研究提供了必要的技术基础。
[Abstract]:At high speed, the flow noise is a prominent factor affecting the submarines' concealment. It is one of the important links of submarine design to accurately evaluate the performance of submarine noise, control the mechanism of flow noise and optimize the design of the corresponding flow noise. In this paper, the theory and calculation method of hydrodynamic acoustics are applied as the research object. Considering the great difference in the physical characteristics of water and air, the theory and algorithm results of aeroacoustics are applied to the field of hydrodynamic acoustics. First of all, combined with water medium state equation, respectively in Cartesian and curvilinear coordinates are derived for water flow noise calculation method of visco acoustic separation control equation and discrete format; then, through the water medium rotating double vortex sound, typical cylindrical acoustic reflection and cylindrical vortex sound interaction phenomenon is an example this paper established the visco acoustic separation verification calculation method and the establishment of an independent field calculation program; finally, the flow around a circular cylinder and a simplified calculation model for cavity flow, using large eddy simulation / mixed visco acoustic separation calculation method simulation of flow noise generation and propagation process, investigated two cases of flow noise sound mechanism and the propagation characteristics, and with the large eddy simulation / acoustic analogy methods are compared. The analysis results show that the method of viscoelastic separation is effective for the analysis of the generation and propagation mechanism of water medium noise. After studying the influence of mesh size, time step and damping coefficient on the calculation results, the viscoelastic separation calculation method and the sound field calculation program compiled in this paper have obtained reasonable and credible calculation results. According to the water compressibility of the medium is very weak, high density and viscosity small physical characteristics and the Maher number is very low, the flow characteristics of high Reynolds number, the first reference calculation method of aeroacoustics, using advanced numerical technique, calculation method of flow noise is established on the water meter. This work provides the necessary technical basis for the development of the software for the estimation of hydrodynamic noise, the overall optimization design and the study of the hydrodynamic noise.
【学位授予单位】：中国舰船研究院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U674.76

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