On the irregular jet formation of shock-accelerated spherical heavy gas bubbles

Guan, Ben; Yang, Hongsen; Yang, Haiwei; Wang, Ge

doi:10.1063/5.0130382

Cited by 5 publications

(1 citation statement)

References 50 publications

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“…Довольно широко исследуется эволюция вихрей и струй в течениях с последовательным воздействием на газовый пузырь падающего и отраженного от закрытого торца ударной трубы скачка уплотнения [4,5]. Однако слабо исследованным остается влияние газового пузыря на импульсную ударно-волновую нагрузку на стенку, представляющее интерес в вопросах взрывобезопасности, а также в качестве основы для разработки новых устройств: газодинамических пробойников и инжекторов.…”

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Импульсная Нагрузка На Стенку При Взаимодействии Ударной Волны С Эллипсоидальным Пристеночным Пузырем Газа Повышенной Плотности

Sirenko¹,

Сутырин²

2023

Письма В Журнал Технической Физики

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Based on the numerical solution of the Euler equations, the problem of the interaction of a shock wave with an ellipsoidal gas bubble of increased density adjacent to a solid wall is studied. The process of refraction and focusing of the shock wave is described - the formation and reflection of transverse shock waves from the axis of symmetry and from the wall. It is found that, depending on the shape of the bubble, qualitatively different flow regimes take place, in which the focusing of the wave on the axis of symmetry occurs before or after the beginning of the reflection of the wave transmitted through the bubble from the wall. The grid convergence of various measures of impulse shock impact on the wall is studied and their dependence on the bubble shape is determined. The highest pressure impulse is achieved for slightly flattened bubbles, when the transverse waves are focused near the center of the wall immediately after the plane transmitted wave is reflected from it.

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Импульсная Нагрузка На Стенку При Взаимодействии Ударной Волны С Эллипсоидальным Пристеночным Пузырем Газа Повышенной Плотности

Sirenko¹,

Сутырин²

2023

Письма В Журнал Технической Физики

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Viscous effects on morphological and thermodynamic non-equilibrium characterizations of shock–bubble interaction

Zhang,

Xu,

Gan

et al. 2023

Physics of Fluids

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A two-fluid discrete Boltzmann model with a flexible Prandtl number is formulated to study the shock–bubble interaction (SBI). This paper mainly focuses on the viscous effects on morphological and thermodynamic non-equilibrium (TNE) characterizations during the SBI process. Due to the rapid and brief nature of the SBI process, viscosity has a relatively limited influence on macroscopic parameters but significantly affects the TNE features of the fluid system. Morphologically, viscosity affects the configuration of the vortex pair, increases both the amplitudes of gradients of average density and average temperature of the fluid field, and reduces circulation of the bubble. As a higher viscosity fluid absorbs more energy from the shock wave, it leads to an increase in both the proportion of the high-density region and the corresponding boundary length for a fixed density threshold. The spatiotemporal features of TNE quantities are analyzed from multiple perspectives. The spatial configuration of these TNE quantities exhibits interesting symmetry, which aids in understanding the way and extent to which fluid unit deviates from the equilibrium state. Theoretically, viscosity influences these TNE quantities by affecting the transport coefficients and gradients of macroscopic quantity. Meanwhile, the viscosity increases the entropy production rate originating from the non-organized momentum flux mainly through amplifying the transport coefficient and enhances the entropy production rate contributed by the non-organized energy flux by raising the temperature gradient. These multi-perspective results collectively provide a relatively comprehensive depiction of the SBI.

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Effects of Mach and Atwood numbers on the shock-induced evolution of a double-layer gas cylinder

Li,

Hao,

Wen

et al. 2024

Physics of Fluids

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The evolution of a double-layer gas cylinder under various Mach numbers (M = 1.27, 1.5, 1.7, and 2.1) and Atwood numbers (A = 0.504, 0.392, 0.194, and −0.202 for the first layer) are studied numerically. At M ≥ 1.5 and A = 0.504, a bulge is generated near the upstream pole of the outer cylinder due to the impingement of a reflected shock wave, which promotes the formation of an upstream jet. At a higher Mach number, the evolution of the jet is suppressed under the influence of a higher pressure upstream of the jet head. The compressibility effects are quantified by the widths and heights of the gas cylinders. The Atwood number is associated with nonlinear acoustic effects, and the sign of A results in a significant variation in the wave patterns. The development of vortex pairs slows down with the decreasing Atwood numbers in the scenario of A > 0 for the first layer gas cylinder, while vortex pairs emerge and propagate in both upstream and downstream directions from the outer interface in the scenario of A < 0 for the first layer. As the Mach numbers and the magnitude of the Atwood numbers are increased, the mixing of various gases is promoted by detecting the circulation and mixed mass. The net circulation can be predicted by the linear summation of the Picone and Boris model and the Samtaney and Zabusky model under various Mach and Atwood numbers.

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On the irregular jet formation of shock-accelerated spherical heavy gas bubbles

Cited by 5 publications

References 50 publications

Импульсная Нагрузка На Стенку При Взаимодействии Ударной Волны С Эллипсоидальным Пристеночным Пузырем Газа Повышенной Плотности

Импульсная Нагрузка На Стенку При Взаимодействии Ударной Волны С Эллипсоидальным Пристеночным Пузырем Газа Повышенной Плотности

Viscous effects on morphological and thermodynamic non-equilibrium characterizations of shock–bubble interaction

Effects of Mach and Atwood numbers on the shock-induced evolution of a double-layer gas cylinder

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