Numerical simulation of shock and detonation waves in bubbly liquids

Tukhvatullina, R. R.; Фролов, С. М.

doi:10.1007/s00193-019-00914-2

Cited by 9 publications

(2 citation statements)

References 33 publications

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“…The surface tension force at a curved interface of phases in BW was introduced in [26,27] to account for different pressures in phases. Shock-induced chemical energy release in SWs propagating through BW saturated with reactive gas bubbles was investigated numerically in [28,29]. The effect of bubble polydispersity on shock wave propagation in a bubbly liquid was investigated numerically in [30].…”

Section: Introductionmentioning

confidence: 99%

Interaction of Shock Waves with Water Saturated by Nonreacting or Reacting Gas Bubbles

et al. 2022

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A compressible medium represented by pure water saturated by small nonreactive or reactive gas bubbles can be used for generating a propulsive force in large-, medium-, and small-scale thrusters referred to as a pulsed detonation hydroramjet (PDH), which is a novel device for underwater propulsion. The PDH thrust is produced due to the acceleration of bubbly water (BW) in a water guide by periodic shock waves (SWs) and product gas jets generated by pulsed detonations of a fuel–oxidizer mixture. Theoretically, the PDH thrust is proportional to the operation frequency, which depends on both the SW velocity in BW and pulsed detonation frequency. The studies reported in this manuscript were aimed at exploring two possible directions of the improvement of thruster performances, namely, (1) the replacement of chemically nonreacting gas bubbles by chemically reactive ones, and (2) the increase in the pulsed detonation frequency from tens of hertz to some kilohertz. To better understand the SW-to-BW momentum transfer, the interaction of a single SW and a high-frequency (≈7 kHz) sequence of three SWs with chemically inert or active BW containing bubbles of air or stoichiometric acetylene–oxygen mixture was studied experimentally. Single SWs and SW packages were generated by burning or detonating a gaseous stoichiometric acetylene–oxygen or propane–oxygen mixture and transmitting the arising SWs to BW. The initial volume fraction of gas in BW was varied from 2% to 16% with gas bubbles 1.5–4 mm in diameter. The propagation velocity of SWs in BW ranged from 40 to 580 m/s. In experiments with single SWs in chemically active BW, a detonation-like mode of reaction front propagation (“bubbly quasidetonation”) was realized. This mode consisted of a SW followed by the front of bubble explosions and was characterized by a considerably higher propagation velocity as compared to the chemically inert BW. The latter could allow increasing the PDH operation frequency and thrust. Experiments with high-frequency SW packages showed that on the one hand, the individual SWs quickly merged, feeding each other and increasing the BW velocity, but on the other hand, the initial gas content for each successive SW decreased and, accordingly, the SW-to-BW momentum transfer worsened. Estimates showed that for a small-scale water guide 0.5 m long, the optimal pulsed detonation frequency was about 50–60 Hz.

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Section: Introductionmentioning

confidence: 99%

Interaction of Shock Waves with Water Saturated by Nonreacting or Reacting Gas Bubbles

et al. 2022

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“…Инициализация и распространение детонационных волн в таких средах обусловлены высвобождением ДВ химической энергии среды, которая компенсирует энергетические затраты волны на преобразование самой среды. В большинстве работ, посвященных пузырьковой детонации, изучаются параметры, свойства и структура ДВ в зависимости от физико-химических свойств и начальных параметров пузырьковых газожидкостных сред [4][5][6][7][8][9][10][11]. Распространение ДВ в многокомпонентных пузырьковых жидкостях и в средах с неоднородным объемным распределением газовой фазы с возможным переходом в область «чистой» жидкости посвящены работы [7,17].…”

Section: Introductionunclassified

Инициирование Детонационных Волн И Воздействие На Них Волнами Малой Амплитуды

Gimaltdinov¹,

Lepikhin²

2020

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На основе численного моделирования исследуется возможность возбуждения детонационных волн в пузырьковых жидкостях с воспламеняющейся газовой фазой волнами давления малой амплитуды. Рассмотрены случаи предварительного снижения начального давления среды в области воздействия внешнего импульса и воздействие на поверхность жидкости двумя последовательными волнами сжатия, каждая из которых по отдельности не способна инициировать детонационную волну. Изучено взаимодействие детонационной волны в пузырьковой жидкости с встречной волной давления. Показано, что детонационная волна проникает сквозь фронт встречной волны, при этом происходит резкое и существенное возрастание ее амплитуды.

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