飞秒脉冲激光冲击强化中等离子体压力时空演化规律

倪辉

doi:10.11883/bzycj-2023-0262

飞秒脉冲激光冲击强化中等离子体压力时空演化规律

doi: 10.11883/bzycj-2023-0262

倪辉^{1, 2,}

1.
中国科学技术大学环境科学与光电技术学院，安徽合肥 230026
2.
中国科学院合肥物质科学研究院安徽光学精密机械研究所，安徽合肥 230031

详细信息

作者简介:
倪　辉（1999－　），男，硕士研究生，nihui@mail.ustc.edu.cn

中图分类号: O383; O539
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- 被引次数: 14
出版历程
- 收稿日期: 2023-08-02
- 修回日期: 2023-12-15
- 网络出版日期: 2024-01-07
- 刊出日期: 2024-02-06

Plasma pressure over time-space evolution law for femtosecond pulses laser shock peening

NI Hui^{1, 2
,}

1.
School of Environmental Science and Optoelectronic Technology, University of Science and Technology of China, Hefei 230026, Anhui, China
2.
Anhui Institute of Optics and Fine Mechanics, HFIPS, Chinese Academy of Sciences, Hefei 230031, Anhui, China

摘要

摘要: 为研究飞秒脉冲激光冲击强化中等离子体压力时空演化规律，利用考虑电子态密度（DOS）效应的模型计算了电子热容和电声耦合系数随电子温度的演化规律，并与采用QEOS（quotidian equation of state）模型计算结果进行了对比；提出DOS飞秒脉冲激光冲击强化模型，计算得到电子温度、晶格温度、等离子体羽位置时间演化规律和等离子体压力时空演化规律，并与QEOS飞秒脉冲激光冲击强化模型结果进行了对比。结果表明：DOS飞秒脉冲激光冲击强化模型计算得到的等离子体羽位置随时间的演化规律与实验结果吻合程度更好；增加激光能量或功率密度、考虑电子DOS效应会增加电子、晶格温度和等离子体压力。
- 飞秒脉冲激光冲击强化 /
- 双温度方程 /
- 态密度 /
- 等离子体压力 /
- 电子热容 /
- 电声耦合系数 /
- 等离子体羽位置 /
- 电子温度 /
- 晶格温度
Abstract: The purpose of this research work is to look into the time-space evolution of plasma pressure for femtosecond pulse laser shock peening (fs-LSP). In this study, propose a model to understand plasma pressure over time-space process in fs-LSP based on the first principle, improved two temperature equations, and plasma hydrodynamic equations. Firstly analyze the plasma plume front location with respect to time by solving the plasma hydrodynamic equations. The simulated results by the electron DOS (density of state) femtosecond pulse laser shock peening model are in better agreement with the experiment results than the QEOS (quotidian equation of state) femtosecond pulse laser shock peening model. The DOS femtosecond pulse laser shock peening model was shown to be effective and superior. Then use the DOS model to calculate how the electron heat capacity and electron-phonon coefficient with respect to electron temperature. Electron heat capacity calculated by the QEOS model is larger than calculated by the electron DOS model, whereas the electron-phonon coefficient is the reverse. Moreover, the electron-phonon coefficient calculated by the QEOS model shows linear variation with respect to the electron temperature, which is the reverse of that calculated by the electron DOS model. Therefore, the electron DOS effect should be considered in two-temperature equations. Next see a graph of electron and lattice temperature with respect to time using the modified two-temperature equations to calculate. Increasing laser energy, decreasing pulse width, and considering the electron DOS effect will increase the electron’s peak temperature, and equilibrium temperature of electron and lattice systems, and reduce the electron-phonon relaxation time. Finally, we utilize the results of the two temperature equations as the initial condition to substitute into the plasma hydrodynamic equations to compute the plasma pressure. plasma peak pressure will rise as laser energy is increased, the pulse width is decreased, and the electron DOS effect is taken into account.
- femtosecond pulse laser shock peening /
- two-temperature equations /
- density of state /
- plasma pressure /
- heat capacity of electron /
- coupling coefficient of electron and phonon /
- plasma plume /
- electron temperature /
- lattice temperature

HTML全文

图 1 飞秒脉冲激光冲击强化示意

Figure 1. Schematic illustration of femtosecond pulses laser shock peening

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图 2 等离子体羽的位置随时间的演化规律

Figure 2. Plasma plume front location at different times

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图 3 电子热容（C_e）和电声耦合系数（G）随电子温度演化规律

Figure 3. Electron heat capacity (C_e) and electron-phonon coefficient (G) versus electron temperature

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图 4 电子温度和晶格温度的时间演化规律

Figure 4. Electron temperature and lattice temperature histories

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图 5 等离子体压力时间演化规律

Figure 5. Plasma pressure histories at the ablative coating surface

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图 6 压力在z轴方向上的分布（t=4 ps）

Figure 6. Plasma pressure distribution in z axis (t=4 ps)

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