Direct Correlation of Noise and Flow of a Jet
Direct Correlation of Noise and Flow of a Jet
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噪声与射流流量的直接相关性
DOI：
10.1121/1.1913245
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发表时间：
1972
影响因子：
2.4
通讯作者：
H. Ribner
中科院分区：
文献类型：
--
作者：
Hie K. Lee;H. Ribner
已经测量了射流的流动和噪声之间的直接相关性，即“原因”和“效果”之间的相关性。研究了两种相关性，即（1）宽带湍流信号（热膜）与宽带声学信号（麦克风），以及（2）窄带滤波湍流信号与窄带滤波声学信号;最终采用后一种方法。根据对气动噪声的普劳德曼Lighthill积分形式的扩展，对相关性进行了分析;这产生了单位射流体积产生的噪声的相对强度和频谱（35个地点）并在远场点接收（r = 96 D，φ = 40°）;这反过来又导致了在测量范围（1D × 1D × 7 D）内射流的连续“切片”与轴向距离X的相对发射。与Ribner的X°定律定性一致，并且每个切片的谱峰基本上位于Powell预测的频率中。最大归一化宽带C
A direct correlation between the flow and noise of a jet—between the “cause” and the “effect”—has been measured. Two kinds of correlations were explored, namely (1) the broad‐band turbulence signal (hot‐film) with the broad‐band acoustic signal (microphone), and (2) the narrow‐band filtered turbulence signal with the narrow‐band filtered acoustic signal; the latter approach was ultimately adopted. The correlations were analyzed in terms of an extension of Proudman's form of Lighthill's integral for aerodynamic noise; this yielded the relative intensity and spectrum of the noise originating from unit volume of a jet (35 locations) and received at a farfield point (r = 96D, φ = 40°); this in turn led to the relative emission of successive “slices” of a jet versus axial distance X over the measurement range (1D ⩽ × ⩽ 7D). Qualitative agreement was found with Ribner's X° law, and the spectral peaks for each slice were located in frequency essentially as predicted by Powell. The maximum normalized broad‐band c...