Bifurcation parameters of a reflected shock wave in cylindrical channels of different roughnesses

Penyazkov, O. G.; Skilandz, A.

doi:10.1007/s00193-017-0739-3

Cited by 7 publications

(2 citation statements)

References 11 publications

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“…Recently, many researchers have investigated different types of optimization methods to improve the shock tube working state for the non-uniform shock wave, such as rupture process of the diaphragm [16,17], boundary layer state [18,19], inner friction of tube [20], and bifurcation of wave [21,22]. Although these methods reduce the estimation error of pressure gain from several aspects, the ISW attenuation remains unresolved and disturbs the practical dynamic calibration tests.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of pressure characteristics behind the reflected shock waves in a metrological shock tube

Yao

Ding²,

Li³

et al. 2022

Metrologia

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The pressure behind the reflected shock wave in real shock tubes deviates from the ideal behavior. This results in lower measurement accuracy and thus affects experiments and interpretations. The deviations depend on several factors, such as the pressure magnitude, shock tube geometry, and working gas. This study investigated it quantitatively and attempted to accurately describe its characteristics via the introduction of two parameters: pressure gain and pressure rise. To improve the accuracy of the pressure gain measurement, a model of the incident shock wave attenuation was proposed and the influence of the shock tube geometry was explored. The experimental results showed that the measurement accuracy was significantly improved: in the cases of 0.07, 0.14, 0.25, and 0.30 mm thick aluminum diaphragms, it was improved by approximately 4, 7, 12, and 22 times, respectively. In addition, a model of the pressure rise dependence on the Mach number of the incident shock wave was constructed through a linear fit of the pressure rise data. Further, the effects of the working gas on the reflected shock wave were examined: the results demonstrate that by working with the air the pressure behind the reflected shock wave exhibited good stability and amplitude.

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Section: Introductionmentioning

confidence: 99%

Experimental investigation of pressure characteristics behind the reflected shock waves in a metrological shock tube

Yao

Ding²,

Li³

et al. 2022

Metrologia

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“…Amir et al (2012) developed a twodimensional time accurate Euler solver to simulate the flow process in the shock tube, and their results showed that when the shock wave reflects from the tube end, it will move to the left and interact with the discontinuity surface and the flow is no longer symmetry. Penyazkov and Skilandz (2017) experimentally studied that small roughness exerts a stabilizing influence on the bifurcation structure in a 76-mm-diameters shock tube. They found that the small-scale turbulence due to the rough surface for Ra = 20m m increases the overshoot pressure behind the reflected shock by a factor of 2, but it can stabilize the shock bifurcated structure with the reflected shock propagating forward.…”

Section: Introductionmentioning

confidence: 99%

Asymmetric characteristics of the shock bifurcation in the reflected shock/boundary layer interaction

Zhang

Zou

Xie

et al. 2018

HFF

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Purpose When a reflected shock interacts with the boundary layer in a shock tube, the shock bifurcation occurs near the walls. Although the study of the shock bifurcation has been carried out by many researchers for several decades, little attention has been devoted to investigate the instability pattern of the bifurcation. This research work aims to successfully capture the asymmetry of the whole flow field, and attempt to achieve the instability mechanism of the shock bifurcation by a direct numerical simulation of the reflected shock wave/boundary layer interaction at Ma = 1.9. In addition, the reason for the formation of the bifurcated structure is also explored. Design/methodology/approach The spatial and temporal evolution of the shock bifurcation is obtained by solving the two-dimensional compressible Navier–Stokes equations using a seventh-order accurate weighted essentially non-oscillatory (WENO) scheme and a three-step Runge–Kutta time advancing approach. Findings The results show that the formation of shock bifurcation is mainly because of the shock/gradient field interaction, and the height of the bifurcated foot increases with the growth of the shock intensity and the gradient field. The unsteady asymmetry of the upper and bottom shock bifurcated structures is because of the vortex shedding with high frequency in the rear recirculation zone, which leads to the fluctuation of the recirculation area. The vortex shedding process behind the bifurcated structure closely resembles the Karman vortex street formed by the flow around the cylinder. The dimensionless vortex shedding frequency varies between 0.01 and 0.02. In comparison to the scenario at Ma = 1.9, the occurring time of instability is delayed and the upper and bottom bifurcated feet intersect in a relatively short time at Ma = 3.5. The region behind the bifurcated shock is a transitional flow field containing obvious cell structures and “isolated islands.” Originality/value This paper discovers an unsteady flow pattern of the shock bifurcation, and the mechanism of this instability in the reflected shock/boundary layer interaction is revealed in detail.

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Modes of mild ignition in shock tubes: Origins and classification

Киверин

Minaev

Yakovenko

2020

Combustion and Flame

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Bifurcation parameters of a reflected shock wave in cylindrical channels of different roughnesses

Cited by 7 publications

References 11 publications

Experimental investigation of pressure characteristics behind the reflected shock waves in a metrological shock tube

Experimental investigation of pressure characteristics behind the reflected shock waves in a metrological shock tube

Asymmetric characteristics of the shock bifurcation in the reflected shock/boundary layer interaction

Modes of mild ignition in shock tubes: Origins and classification

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