A simple model of shock cell noise generation and its reduction

Y. Chan
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引用次数: 6

Abstract

Based on the data of near field surveys of the sound pressure from a choked jet, a simple model is proposed for the mechanism of the screech generation. A convected wave propagates downstream along the jet boundary and is modulated by its interaction with the shock-expansion waves of the jet. These interactions generate strongdipoleradiations. Using this model, an excellent reproduction of the essential features of the experimental results is obtained. By preventing the formation of shock waves inside the jet, the strong dipole radiation and hence the screech noise can be eliminated. Design data for perforated nozzles to achieve fuU expansion of the jet are provided. This avoids the mechanical complication of an adjustable convergent-divergent nozzle.
冲击电池噪声产生及降噪的简单模型
基于近场实测的呛流射流声压数据,提出了一个简单的呛声产生机理模型。对流波沿射流边界向下游传播,并通过与射流激波膨胀波的相互作用进行调制。这些相互作用产生强烈的偶极辐射。利用该模型,可以很好地再现实验结果的基本特征。通过防止射流内部形成激波,可以消除强偶极子辐射,从而消除尖锐噪声。给出了实现射流fuU膨胀的穿孔喷嘴的设计数据。这避免了可调节的会聚-发散喷嘴的机械复杂性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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