旋转声场中的径向抵消
Radial cancellation in spinning sound fields
摘要：
本文通过对具有角度依赖性$\exp \J nθ$和任意径向依赖性的声源辐射特性的精确分析，确定了圆形声源的辐射部分。发现辐射场中的自由度不大于$k-n$，其中$k$是波数。低频辐射源的辐射部分是波数。明确指出了低频辐射源的辐射部分，并用于分析噪声消除。将所得结果应用于喷流噪声源的识别，并对喷流噪声场的低阶结构提出了一种解释。
英文摘要：
The radiating part of a circular acoustic source is determined on the basis of an exact analysis of the radiation properties of a source with angular dependence $\exp \J nθ$ and arbitrary radial dependence. It is found that the number of degrees of freedom in the radiated field is no greater than $k-n$, where $k$ is the wavenumber. The radiating part of the source at low frequency is the wavenumber. The radiating part of the source at low frequency is explicitly stated and used to analyze noise cancellation. The results are applied to the identification of sources in jet noise and an explanation for the low order structure of jet noise fields is proposed.
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