Relaxation of Light Emission from Hot Spots Depending on the Characteristics of the Environment

IF 0.9 4区工程技术 Q4 ENERGY & FUELS Combustion, Explosion, and Shock Waves Pub Date : 2023-11-21 DOI:10.1134/s0010508223050088

S. A. Bordzilovskii, S. M. Karakhanov, A. V. Plastinin

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Abstract

The light emission from samples consisting of a transparent matrix with inclusions of hot spots was studied. The matrix material was water and epoxy resin. Hot spots were generated by shock compression of MS-V hollow glass microballoons. In the pressure range 0.7–29 GPa, a brightness decay time of 280 to 70 ns was recorded. The brightness decay time increased by more than an order of magnitude when replacing the optical window made of solid epoxy resin by LiF. However, even this increased time of brightness decay is much shorter than the estimated times of hot-spot temperature relaxation due to heat conduction in the calculation with stationary parameters (\(t_{a} = 10^{- 2}\) s) and due to light emission (\(\tau = 2.4 \cdot 10^{-3}\) s). It is concluded that the dominant mechanism of temperature relaxation is the turbulent mixing of the medium behind the shock-wave front. The experimental results show that in numerical simulations of the temperature field during shock-wave propagation through a pore, it is necessary to take into account the viscosity and strength of the matrix material.

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热点光发射随环境特性的弛豫

摘要研究了含有热点的透明基体样品的发光特性。基体材料为水和环氧树脂。对MS-V中空玻璃微球进行激波压缩产生热点。在0.7 ～ 29 GPa的压力范围内，光亮度衰减时间为280 ～ 70 ns。用LiF代替固体环氧树脂制成的光学窗，其亮度衰减时间增加了一个数量级以上。然而，即使这种亮度衰减的增加时间也远远短于平定参数计算中由于热传导引起的热点温度弛豫时间(\(t_{a} = 10^{- 2}\) s)和由于光发射引起的热点温度弛豫时间(\(\tau = 2.4 \cdot 10^{-3}\) s)。由此得出结论，温度弛豫的主要机制是激波前缘后介质的湍流混合。实验结果表明，在数值模拟冲击波在孔隙中传播的温度场时，有必要考虑基体材料的粘度和强度。

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来源期刊

Combustion, Explosion, and Shock Waves 工程技术-材料科学：综合

CiteScore

1.60

自引率

16.70%

发文量

审稿时长

5.7 months

期刊介绍： Combustion, Explosion, and Shock Waves a peer reviewed journal published in collaboration with the Siberian Branch of the Russian Academy of Sciences. The journal presents top-level studies in the physics and chemistry of combustion and detonation processes, structural and chemical transformation of matter in shock and detonation waves, and related phenomena. Each issue contains valuable information on initiation of detonation in condensed and gaseous phases, environmental consequences of combustion and explosion, engine and power unit combustion, production of new materials by shock and detonation waves, explosion welding, explosive compaction of powders, dynamic responses of materials and constructions, and hypervelocity impact.