Abstract—

The relationship between velocity and pressure fluctuations in the near field of a subsonic turbulent jet and at its axis is investigated. The data of the measurements of the velocity fluctuations at the jet axis and the pressure fluctuations in the jet near-field are analyzed. It is shown that the spectral characteristics of the velocity fluctuations at the axis can be converted to the spectra of the axisymmetric mode of the pressure fluctuations outside the jet. The conversion is based on the use of the eigenfunctions of the pressure fluctuations obtained in solving the stability problem for a cylindrical mixing layer of finite thickness in the locally-parallel approximation.

中文翻译：

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湍流射流轴及其近场速度与压力脉动的关系

摘要-

研究了亚音速湍流射流近场及其轴处速度和压力波动之间的关系。分析了射流轴速度脉动和射流近场压力脉动的测量数据。结果表明，轴处速度脉动的谱特征可以转化为射流外压力脉动轴对称模态的谱。该转换基于使用在局部平行近似中解决有限厚度圆柱形混合层的稳定性问题中获得的压力波动的本征函数。