螺旋桨空化及噪声性能研究
发布时间：2019-01-30 09:01
【摘要】：螺旋桨是目前应用最为广泛的推进器之一，其运转于水下会改变水下速度场和压力场的分布，进而会产生强烈的辐射噪声，这种声音往往会成为水下探测的关键目标。这种噪声会影响到船舶及舰艇的声隐身性，进而影响舰船的打击力和生存力，对用于军事目的的船舶有着至关重要的影响。螺旋桨通常是工作在船后非均匀尾流场之中，在运转过程中会受到不稳定力的作用，进而会产生离散音调噪声和空化。因此结合软件准确的预报螺旋桨的空化和噪声就有了重要的意义。 本文主要是基于螺旋桨基本理论、计算流体力学、面元法以及Lighthill声类比理论结合计算软件Pumplinx和Actran对某螺旋桨的水动力性能、空化性能以及噪声性能进行了较为系统的分析。分别对螺旋桨定常和非定常水动力性能进行了深入研究，并且分析了空化计算模型对空化模拟结果的影响，最后对螺旋桨空化噪声和无空化噪声进行了对比分析。 首先，论文对螺旋桨理论方法研究进展进行了简要的叙述，较为系统的总结了国内外对螺旋桨水动力性能、螺旋桨空化性能和噪声性能的研究方法以及发展趋势。 其次，用时域方法求解了螺旋桨的定常和非定常水动力性能，设定流体为没有旋度和不可压缩的理想流体。基于纳维-斯托克斯方程运用Pumplinx对不同进速系数下的螺旋桨水动力性能进行了数值模拟，验证了分析方法的正确性及结合软件模拟的可行性。得到并分析了流场速度和压力分布。 再次，基于速度势的面元法运用Pumplinx对螺旋桨片状空化问题进行了数值预报，，并分析了螺旋桨空化计算结果受空化模型、计算阶次、螺旋桨进速系数和潜深等因素影响的变化规律。 最后，基于Lighthill声类比理论和傅立叶变换结合声学软件Actran预报螺旋桨噪声性能，分析了不同位置处声压谱和声功率谱的特性、噪声随距离变化的衰减特性、不同进速系数下的声压级云图等。并进一步分析了非均匀进流、螺旋桨空化、进速系数（即轻载、正常荷载、重载）等对螺旋桨噪声的影响。 本文主要的研究工作是对螺旋桨空化以及噪声性能的预报研究，对今后船舶工程螺旋桨的设计研究有着重要的指导意义。
[Abstract]:Propeller is one of the most widely used propellers at present. It can change the distribution of velocity field and pressure field under water, and then produce strong radiation noise, which often becomes the key target of underwater detection. This kind of noise will affect the acoustic stealth of ships and ships, and then affect the impact force and survivability of ships, which has a vital effect on ships used for military purposes. The propeller usually works in the non-uniform wake field behind the ship, which is affected by unstable force in the course of operation, and then produces discrete pitch noise and cavitation. So it is very important to predict cavitation and noise of propeller with software. Based on the basic theory of propeller, computational fluid dynamics, panel method and Lighthill acoustic analogy theory, the hydrodynamic performance, cavitation performance and noise performance of a propeller are analyzed systematically with the combination of Pumplinx and Actran. The steady and unsteady hydrodynamic performance of propeller are studied, and the influence of cavitation calculation model on cavitation simulation results is analyzed. Finally, the cavitation noise and cavitation noise of propeller are compared and analyzed. Firstly, the research progress of propeller theory and method is briefly described, and the research methods and development trend of propeller hydrodynamic performance, propeller cavitation performance and noise performance are systematically summarized at home and abroad. Secondly, the steady and unsteady hydrodynamic performance of propeller is solved by time-domain method, and the fluid is set as an ideal fluid without curl and incompressibility. Based on the Navier-Stokes equation, the hydrodynamic performance of propeller with different feed coefficients is simulated by using Pumplinx, which verifies the correctness of the analysis method and the feasibility of software simulation. The velocity and pressure distributions of the flow field are obtained and analyzed. Thirdly, the surface element method based on velocity potential is used to predict the propeller blade cavitation problem by using Pumplinx, and the cavitation model and order are analyzed. The variation law of propeller speed advance coefficient and potential depth and other factors. Finally, based on Lighthill acoustic analogy theory and Fourier transform combined with acoustic software Actran to predict propeller noise performance, the characteristics of sound pressure spectrum and sound power spectrum at different positions are analyzed, and the attenuation characteristics of noise varying with distance are analyzed. The sound pressure level cloud diagram with different forward velocity coefficient. The effects of inhomogeneous flow, cavitation of propeller and feed coefficient (i.e. light load, normal load, heavy load) on propeller noise are further analyzed. The main research work in this paper is the prediction of propeller cavitation and noise performance, which is of great significance to the design and research of ship engineering propeller in the future.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U664.33;U661
本文编号：2417971
[Abstract]:Propeller is one of the most widely used propellers at present. It can change the distribution of velocity field and pressure field under water, and then produce strong radiation noise, which often becomes the key target of underwater detection. This kind of noise will affect the acoustic stealth of ships and ships, and then affect the impact force and survivability of ships, which has a vital effect on ships used for military purposes. The propeller usually works in the non-uniform wake field behind the ship, which is affected by unstable force in the course of operation, and then produces discrete pitch noise and cavitation. So it is very important to predict cavitation and noise of propeller with software. Based on the basic theory of propeller, computational fluid dynamics, panel method and Lighthill acoustic analogy theory, the hydrodynamic performance, cavitation performance and noise performance of a propeller are analyzed systematically with the combination of Pumplinx and Actran. The steady and unsteady hydrodynamic performance of propeller are studied, and the influence of cavitation calculation model on cavitation simulation results is analyzed. Finally, the cavitation noise and cavitation noise of propeller are compared and analyzed. Firstly, the research progress of propeller theory and method is briefly described, and the research methods and development trend of propeller hydrodynamic performance, propeller cavitation performance and noise performance are systematically summarized at home and abroad. Secondly, the steady and unsteady hydrodynamic performance of propeller is solved by time-domain method, and the fluid is set as an ideal fluid without curl and incompressibility. Based on the Navier-Stokes equation, the hydrodynamic performance of propeller with different feed coefficients is simulated by using Pumplinx, which verifies the correctness of the analysis method and the feasibility of software simulation. The velocity and pressure distributions of the flow field are obtained and analyzed. Thirdly, the surface element method based on velocity potential is used to predict the propeller blade cavitation problem by using Pumplinx, and the cavitation model and order are analyzed. The variation law of propeller speed advance coefficient and potential depth and other factors. Finally, based on Lighthill acoustic analogy theory and Fourier transform combined with acoustic software Actran to predict propeller noise performance, the characteristics of sound pressure spectrum and sound power spectrum at different positions are analyzed, and the attenuation characteristics of noise varying with distance are analyzed. The sound pressure level cloud diagram with different forward velocity coefficient. The effects of inhomogeneous flow, cavitation of propeller and feed coefficient (i.e. light load, normal load, heavy load) on propeller noise are further analyzed. The main research work in this paper is the prediction of propeller cavitation and noise performance, which is of great significance to the design and research of ship engineering propeller in the future.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U664.33;U661
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