Statistical behavior of post-shock overpressure past grid turbulence

Sasoh, Akihiro; Harasaki, T.; Kitamura, Toshio; Takagi, Daisuke; Ito, S.; Matsuda, Atsushi; Nagata, Kouji; Sakai, Yasuhiko

doi:10.1007/s00193-014-0507-6

Cited by 20 publications

(4 citation statements)

References 35 publications

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“…As expected from the relation between the shock surface shape and overpressure discussed above, the velocity defect of the wake results in decrease in áD ñ p . rms tends to increase with u rms , consistent with previous studies [13,17,18]. The shock wave in the double-cylinder experiments interacts with the DC wake after it passes the RC wake, where D áD ñ p p rms is larger than in the single cylinder experiment, and the DC wake contributes to the increase in D áD ñ p p rms .…”

Section: Overpressure Characteristicssupporting

confidence: 89%

“…Donzis [15] and Larsson et al [16] showed the existance of 'shock holes' or local disappearance of jumps in physical quantities across the shock wave as a result of the shock-turbulence interaction. Sasoh et al [17] conducted wind tunnel experiments on interaction between a weak spherical shock wave and grid turbulence. Such quasi-homogeneous isotropic turbulence as grid turbulence enabled them to independently investigate the effects of velocity fluctuation on the shock characteristics apart from the effect of an inhomogeneous mean velocity profile.…”

Section: Introductionmentioning

confidence: 99%

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Statistical properties of spherical shock waves propagating through grid turbulence, turbulent cylinder wake, and laminar flow

et al. 2019

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Wind tunnel experiments are reported for a spherical shock wave propagating through turbulent wakes of a single cylinder, double cylinders, grid-turbulence, and a laminar flow, whose influences on the shock wave are compared. Overpressure behind the shock wave is measured on a plate while streamwise velocity is measured at the flow point between the measurement plate and the location of the shock wave ejection. Average of peak-overpressure observed upon arrival of the shock wave is decreased by the mean velocity defect of the cylinder wake. Root mean squared (rms) peak-overpressure fluctuation divided by the averaged peak-overpressure is increased by turbulence, and it becomes larger with the rms velocity fluctuation. Correlation coefficients are calculated between fluctuations of peak-overpressure and low-pass filtered fluid velocity. The strong positive correlation is found for the fluid at the location where the shock ray toward the pressure measurement point passes. The length scale of velocity fluctuation with the strong correlation is related to the integral length scale of turbulence. In the double-cylinder wake experiments, the shock wave that has passed one cylinder wake interacts again with another cylinder wake before it reaches the measurement plate. The correlation coefficient for the velocity fluctuation of the first wake is weakened by the second wake, and this influence becomes more important when the rms velocity fluctuation of the second wake is larger.

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Section: Overpressure Characteristicssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Statistical properties of spherical shock waves propagating through grid turbulence, turbulent cylinder wake, and laminar flow

et al. 2019

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“…In spite of intensive efforts of numerical investigations [19][20][21][22][23][24][25][26], experimental data are necessary. Past experimental works used various configurations of a shock wave and turbulence [27][28][29][30][31][32][33][34][35][36]. The most fundamental configuration is the interaction between a plane shock wave and canonical turbulence.…”

Section: Shock-turbulence Interactionmentioning

confidence: 99%

Shock Wave Moderation by Characterized Disturbances

Sasoh¹,

Iwakawa²

2019

Proceedings of the 32nd International Symposium on Shock Waves (ISSW32 2019)

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“…Although experimental studies on shock-turbulence interactions have been conducted in various systems (Lipkens and Blackstock 1998, Kim et al 2010, Sasoh et al 2014, Tamba et al 2016, Inokuma et al 2017, Kitamura et al 2017, it has been challenging to realize the interaction between a normal shock wave and isotropic turbulence. Dosanjh (1956), Honkan and Andreopoulos (1992), Honkan et al (1994), Xanthos et al (2002) and Agui et al (2005) used shock tubes to induce interactions of normal shock wave reflected from the end walls with grid turbulence.…”

Section: Introductionmentioning

confidence: 99%

Losing the shock wave front profile due to interaction with turbulence

Fukushima¹,

Wei²,

Ogawa³

et al. 2021

Fluid Dyn. Res.

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In this study, losing the shock wave profiles under interactions with grid turbulence was investigated experimentally and theoretically. We demonstrated that the shock wave contrast on side-view schlieren images gradually decreased to an undetectable level in the experiment. This shock wave ‘vanishment’ occurred at a low shock Mach number with a high turbulent Mach number. With a relatively strong shock wave, the contrast of the shock wave remained detectable although the shock wave profile region was expanded. To understand the shock wave vanishment phenomenon during interaction with turbulence, we established a shock wave vanishment model based on the solution of a one-dimensional interaction between a shock wave and forward induced flow. The criterion of the occurrence of local vanishment of the shock wave was derived as M t ⩾ ( M s 2 − 1 ) / M s , where M t is the turbulent Mach number and M s is the shock Mach number. The proposed shock vanishment model involves the effect of the interaction length and the shock wave recovery characteristics. The derived model explains the vanishment of weak shock wave profile during turbulence with an interaction length of ten times the order of the integral scale of the turbulence, as observed in the experiment.

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Statistical behavior of post-shock overpressure past grid turbulence

Cited by 20 publications

References 35 publications

Statistical properties of spherical shock waves propagating through grid turbulence, turbulent cylinder wake, and laminar flow

Statistical properties of spherical shock waves propagating through grid turbulence, turbulent cylinder wake, and laminar flow

Shock Wave Moderation by Characterized Disturbances

Losing the shock wave front profile due to interaction with turbulence

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