毕业论文-不同螺距导管桨的噪声分析.doc

哈尔滨工业大学本科毕业设计(论文) I 摘要随着船舶节能越来越受到人们的关注,导管螺旋桨凭借其较高的推进效率而获得广泛的关注,目前在很多船舶上得到了很好的应用。同时,舰船噪声成为了现在有关业界关心的技术问题,而螺旋桨噪声是舰船噪声的主要来源。本文对于导管螺旋桨在非定常水动力下的噪声进行了计算,并通过改变导管螺旋桨的螺距, 对不同螺距导管桨的噪声进行对比,可以看到螺距不同对导管桨噪声的影响。本文是对不同螺距导管桨噪声的分析和对比,所以首先运用 AutoGrid 和 Pointwis e 对导管桨的桨叶和外部流场进行建模, 然后用螺距改变公式改变导管桨的螺距,对改变螺距后的导管桨重新建模;然后对重新建模好的导管桨进行网格划分,使每个部分都有对应的网格,运用 CFX 对不同螺距的导管桨分别进行定常和非定常水动力计算,得到各自的水动力计算结果;运用噪声分析软件 Actran 对非定常计算得到的结果进行噪声的计算,得出导管桨的噪声性能结果,并对不同螺距导管桨的噪声结果进行对比,观察不同螺距导管桨噪声性能的不同。关键词:导管螺旋桨;不同螺距;网格;非定常;噪声哈尔滨工业大学本科毕业设计(论文) II Abstract As the ship is increasing attention, ducted propellers by virtue of their higher propulsive efficiency and access toa wide range of concerns in many ships has been well ship noise now became the industry concerned with technical issues, and propeller noise isa major source of ship radiated- ducted propellers in unsteady hydrodynamic noise is calculated, and by changing the pitch of the propeller, pare different pitch ducted propeller noise, you can see the impact of different pitch of ducted propeller noise. This paper is an analysis of different pitch ducted propeller noise and contrast, so first of all use AutoGrid and Pointwise ducted propeller blades and outer flow field model, and then use the pitch change formula change ducted propeller pitch . Modeling again after changing the pitch of ducted propeller .And then on to mesh modeling good ducted propellers, each part has a corresponding grid, using the CFX ducted propeller of different pitch, steady and unsteady hydrodynamic calculation, obtained results of hydrodynamic Actran using noise analysis for unsteady calculation of results for calculation of noise, noise performance of ducted propellers results are obtained, and pare results of different pitch ducted propeller noise, observe the different pitch ducted propeller noise performance. Keywords: Ducted propeller , Different pitch , Grid , Unsteady, Noise 哈尔滨工业大学本科毕业设计(论文) III 目录摘要...................................