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xie zhen zi zuo yong he cheng she liu de sheng xue ji li yan jiu
Author(s): 
Pages: 1061-1064
Year: Issue:  6
Journal: Journal of Engineering Thermophysics

Keyword:  harmonic oscillatorsynthetic jetsound propagation characteristicsound source feature;
Abstract: 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。
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