Power spectrum of high Schmidt number scalar in a turbulent jet at a moderate Reynolds number

Power spectrum of high Schmidt number scalar in a turbulent jet at a moderate Reynolds number
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中等雷诺数湍流射流中高施密特数标量的功率谱

DOI:
10.1007/s00348-021-03216-5
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发表时间:
2021
影响因子:
2.4
通讯作者:
Yasumasa Ito
Yasumasa Ito
中科院分区:
工程技术3区
文献类型:
--
作者:
Koji Iwano;Jumpei Hosoi;Yasuhiko Sakai;Yasumasa Ito

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本文测量了高施密特数染料()在液相轴对称湍流射流中的浓度脉动功率谱。我们使用的光纤激光诱导荧光探针,具有2.8米的空间分辨率和140米的工作距离。它被证实,探针可以实现高的信噪比,通过使用高浓度的染料,这使得我们能够检查光谱形状几乎到巴彻勒尺度为目前的实验条件。测得的功率谱捕获从惯性对流范围的粘性对流范围在(:Kolmogorov尺度)左右的过渡。功率谱的标度律在粘性对流区几乎成立。然而,光谱并不完全遵循刻度,而是在范围内有一个小的凸起。研究还表明,小尺度浓度波动对浓度波动均方根值的贡献很大。
The power spectrum of concentration fluctuation of high Schmidt number dye () was measured in a liquid-phase axisymmetric turbulent jet at the jet Reynolds number of. We used the optical fiber LIF probe which has a spatial resolution of 2.8m and a working distance of 140m. It is confirmed that the probe can achieve high signal-to-noise ratio by using high concentration dye, which enabled us to examine the spectral shape almost up to the Batchelor scale for the present experimental condition. The measured power spectrum captures the transition from the inertial–convective range to the viscous–convective range at around(: Kolmogorov scale). Thescaling law for the power spectrum almost holds in the viscous–convective range. However, the spectrum does not perfectly follow thescaling but has a small bump in the range. It is also shown that the small-scale concentration fluctuation largely contributes to the r.m.s value of concentration fluctuation.Graphic abstract
使用高性能计算进行应变湍流和低扩散率湍流混合
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发表时间: 2017
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