Similarity scaling of pressure fluctuation in turbulence.
Similarity scaling of pressure fluctuation in turbulence.
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DOI：
10.1103/physreve.68.026309
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发表时间：
2003-08
期刊：
影响因子：
--
通讯作者：
Y. Tsuji;T. Ishihara
中科院分区：
文献类型：
--
作者：
Y. Tsuji;T. Ishihara
利用电容式传声器和压阻式换能器测量了湍流射流中的压力波动。从Kolmogorov普适标度的观点出发，讨论了归一化压力谱的幂指数和比例常数。在600<；或=R(Lambda)的范围内，证实了标度指数接近-7/3的明显的幂定律。这些雷诺数比速度起伏时的雷诺数大得多，以实现柯尔莫戈洛夫定标。光谱常数不是普适的，而是依赖于雷诺数。将测得的压力概率密度函数与直接数值模拟结果进行了比较。
Pressure fluctuation was measured in a turbulent jet using a condenser microphone and piezoresistive transducer. The power-law exponent and proportional constant of normalized pressure spectrum are discussed from the standpoint of Kolmogorov universal scaling. The clear power law with scaling exponent close to -7/3 was confirmed in the range of 600<or=R(lambda). These Reynolds numbers are much larger than those in velocity fluctuation to achieve Kolmogorov scaling. The spectral constant is not universal but depends on Reynolds numbers. Measured pressure probability density functions are compared with direct numerical simulation.