中文摘要：

本文提出了三势流组成的复合射流模型,用初等谐振子波包方法分析了点源、偶涡和复合射流的声源特性和传播特性。在管径较小时的点源外部谐振子作用声压值大于经典作用值。双偶极子的近、外场声压分布等值线近似于圆簇,其内部声压类似于双帽子分布,两帽环之外呈现虚数＂真空＂带。复合射流点源声场中管径越小,其声压沿轴线四周越发散。声压在近管口的轴线四周有很强的指向,轴向指向最大,在45°方向左右有一个稍高的指向。周期流动近场近轴线四周影响不大,在0°～20°方向有较大指向,而远场一周期内出现两个等声压分布时间段。本文为微观层次下揭示声振子传播特性和音源特性打下了基础。

英文摘要：

The composite jet model is obtained from three potential flows,its sound source characteristics and propagation characteristics are analyzed with elementary harmonic oscillator wave packet method,and so with the point source,dual vortexes.The external harmonic-oscillator sound pressure values of point source in the smaller diameter condition are greater than the classic value.The near and far field sound pressure distribution contours of dual dipoles are similar to round cluster,internal sound pressure shows a double hat distribution character,and presents imaginary ＂vacuum＂ outside the two hap ring.About the composite jet point source sound field,the smaller the diameter,the more scattered around along the axis.The sound pressure has a strong point around along the axis nearly the nozzle axis,axial point is maximum,a slightly higher point in the direction of about 45°. In the periodic flow condition,there is little effect on the sound pressure level of on the axis around nearly the nozzle axis,a higher point in the direction of about 0°~20°.Two equal-value zones appear in the sound pressure level-time distribution in one cycle at far-field region.These give foundation to reveal the propagation characteristics and source features of the acoustic resonator at micro level.