基于点源模型的螺旋桨负载噪声频域预报  

Predicting the loading noise of propeller based on point source model in frequency domain

作　　者：付建[1] 王永生[1] 

机构地区：[1]海军工程大学动力工程学院,湖北武汉430033

出　　处：《华中科技大学学报（自然科学版）》2014年第4期77-80,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金青年科学基金资助项目(51209212)

摘　　要：在点源模型基础上,将旋转力源离散为均匀分布在旋转轨迹上的有限个固定偶极源,各偶极源间的时间差转换为对应的相位差,结合边界元方法可以计算任意边界条件下的旋转声源频域负载噪声.以E779A船用侧斜螺旋桨为对象,在稳态流场计算得到验证的基础上,通过瞬态流场数值计算得到了不同时刻螺旋桨表面每个单元对应面力.将旋转面力沿运动轨迹离散后,首先计算了单个桨叶的负载噪声,计算结果同文献值符合较好;然后计算了整桨负载噪声,桨盘面内测点轴频对应的辐射声压最大,轴线方向测点叶频处辐射声压最大,负载噪声在桨轴平面指向性呈类8字形,表现为偶极子声源特性.The rotating force source can be replaced by finite stationary sources distributing along the rotating trace based on point source model, and the time difference between dipoles can be trans- formed into phase difference. The loading noise of rotating point force can be simulated using the boundary element method at arbitrary boundary conditions. Taking the propeller of E779A as object, the precision of steady flow calculation was validated, after that the element force of propeller in dif- ferent time were got by transient flow calculation. The loading noise of single blade was firstly calcu- lated after discretization of the rotating force, in which the result calculated was well in agreement with result from the reference. And then the loading noise of propeller was calculated. The result shows that when the monitor is in propeller plane, the biggest acoustic pressure is in aft passing fre- quency; when the monitor is in axis direction, the biggest acoustic pressure is in blade passing fre- quency; the directivity of loading noise in axis plane is an 8 shape which is similar as a dipole source.

关 键 词：螺旋桨 负载噪声 点源模型 旋转声源 边界元法 计算流体力学 

分 类 号：U664.33[交通运输工程—船舶及航道工程]