Statistical behavior of post-shock overpressure past grid turbulence |
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Authors: | Akihiro Sasoh Tatsuya Harasaki Takuya Kitamura Daisuke Takagi Shigeyoshi Ito Atsushi Matsuda Kouji Nagata Yasuhiko Sakai |
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Institution: | 1. Department of Aerospace Engineering, Nagoya University, Nagoya, 464-8603, Japan 2. Department of Mechanical Science and Engineering, Nagoya University, Nagoya, 464-8603, Japan 3. Department of Mechanical Engineering, Meijo University, Nagoya, 468-8502, Japan
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Abstract: | When a shock wave ejected from the exit of a 5.4-mm inner diameter, stainless steel tube propagated through grid turbulence across a distance of 215 mm, which is 5–15 times larger than its integral length scale \(L_{u}\) , and was normally incident onto a flat surface; the peak value of post-shock overpressure, \(\Delta P_{\mathrm{peak}}\) , at a shock Mach number of 1.0009 on the flat surface experienced a standard deviation of up to about 9 % of its ensemble average. This value was more than 40 times larger than the dynamic pressure fluctuation corresponding to the maximum value of the root-mean-square velocity fluctuation, \(u^{\prime }= 1.2~\hbox {m}/\hbox {s}\) . By varying \(u^{\prime }\) and \(L_{u}\) , the statistical behavior of \(\Delta P_{\mathrm{peak}}\) was obtained after at least 500 runs were performed for each condition. The standard deviation of \(\Delta P_{\mathrm{peak}}\) due to the turbulence was almost proportional to \(u^{{\prime }}\) . Although the overpressure modulations at two points 200 mm apart were independent of each other, we observed a weak positive correlation between the peak overpressure difference and the relative arrival time difference. |
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