Measurements of scalar power spectra in high Schmidt number turbulent jets

Measurements of scalar power spectra in high Schmidt number turbulent jets
复制标题

高施密特数湍流射流中标量功率谱的测量

DOI:
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发表时间:
1992
影响因子:
3.7
通讯作者:
P. Dimotakis
P. Dimotakis
中科院分区:
工程技术2区
文献类型:
--
作者:
P. Miller;P. Dimotakis

文献摘要

被引文献

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本文报道了高施密特数圆形湍流射流(SC≃1.9×10~3)的时间标量功率谱的实验研究,喷流雷诺数为1.2 5×10~4≤Re≤7.2×10~4。在中等尺度上,我们发现了一个具有斜率(对数导数)的谱,它的绝对值随着雷诺数的增加而增加,但在我们的实验中,最高雷诺数时的绝对值仍然小于5/3。在最小的尺度上,我们的光谱没有表现出k−1的幂定律行为,而是在某些情况下,在超过40倍的尺度范围内,似乎被对数正态函数近似。
We report on an experimental investigation of temporal, scalar power spectra of round, high Schmidt number (Sc ≃ 1.9 × 103), momentum-dominated turbulent jets, for jet Reynolds numbers in the range of 1.25 × 104 ≤ Re ≤ 7.2 × 104. At intermediate scales, we find a spectrum with a slope (logarithmic derivative) that increases in absolute value with Reynolds number, but remains less than 5/3 at the highest Reynolds number in our experiments. At the smallest scales, our spectra exhibit no k−1 power-law behaviour, but, rather, seem to be approximated by a log-normal function, over a range of scales exceeding a factor of 40, in some cases.