Two-dimensional numerical simulation of a decaying laser spark in air with radiation loss

R. Joarder; G.C. Gebel; T. Mosbach

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Two-dimensional numerical simulation of a decaying laser spark in air with radiation loss

机译：具有辐射损失的空气中衰减激光火花的二维数值模拟

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摘要

Results are presented on two-dimensional numerical simulation of a decaying laser spark after the air breakdown. Radiation loss is modeled in a finite volume framework for a finite wavelength range of the emitted rays. The redistribution of assumed absorbed energy among different parts, namely the blast wave energy, the radiative heat energy and the left-over energy is quantified. About 5% of the absorbed energy is found to be trapped around the breakdown region after the blast wave moves away. A prediction is made about the actual available energy for ignition of a combustible mixture. A distinct rollup motion around the breakdown region is demonstrated from the simulation, which is in accordance with other numerical and experimental observations. Finally, the evolution of the blast wave radius with time is validated against in-house experimental data.

机译：空气击穿后，衰减的激光火花的二维数值模拟显示了结果。在有限的体积框架内对辐射的有限波长范围内的辐射损耗进行建模。假定吸收能量在不同部分之间的重新分配，即爆炸波能量，辐射热能和剩余能量被量化。爆炸波移开后，大约5％的吸收能量被捕获在击穿区域周围。对可燃混合物着火的实际可用能量进行了预测。模拟显示了击穿区域周围明显的上滚运动，这与其他数值和实验观察结果一致。最后，针对室内实验数据验证了爆炸波半径随时间的变化。

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来源
《International Journal of Heat and Mass Transfer》 |2013年第8期|284-300|共17页
作者
R. Joarder; G.C. Gebel; T. Mosbach;
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作者单位

Institute of Combustion Technology, German Aerospace Center (DLR), 70569 Stuttgart, Germany;

Institute of Combustion Technology, German Aerospace Center (DLR), 70569 Stuttgart, Germany;

Institute of Combustion Technology, German Aerospace Center (DLR), 70569 Stuttgart, Germany;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类
关键词
Laser spark; Radiation loss; Absorbed energy; Blast wave radius; Ignition;

机译：激光火花辐射损失;吸收的能量;爆炸波半径;点火;

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Two-dimensional numerical simulation of a decaying laser spark in air with radiation loss

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