短脈沖激光支持爆轟波參數(shù)分析
發(fā)布時間：2018-08-13 19:12
【摘要】：隨著激光理論的發(fā)展,衍生出了激光與材料相互作用物理學(xué)為基礎(chǔ)理論支撐的一系列學(xué)科。由于激光作用到靶材的時候會使得靶材表面產(chǎn)生一系列的物理化學(xué)變化,進而使得靶材材料的性質(zhì)發(fā)生改變,甚至使得靶材材料發(fā)生一系列的毀傷。在這一系列的變化過程中,首先是材料升溫熔融、然后氣化形成等離子體,等離子體繼續(xù)吸收激光能量形成激光支持爆轟波。所以這一系列的變化都與激光支持爆轟波有間接或直接的關(guān)系,因此研究激光支持爆轟波和分析激光參數(shù)對它的影響是不可或缺的。本論文中使用ns激光脈沖照射鋁板,陳述了從激光支持爆轟波起爆到激光支持爆轟波形成的整個過程,并且在這個過程中還仔細(xì)說明了物質(zhì)對激光的吸收過程。分析了激光支持爆轟波的基本理論,然后構(gòu)建了短脈沖激光支持爆轟波參數(shù)分析的理論模型,通過這個模型推演得到等離子體的控制方程。針對整個激光支持爆轟波的形成過程,論文中使用C-J模型對等離子體初始狀態(tài)進行了分析,確定了起爆階段的等離子體的一系列參數(shù)。然后根據(jù)等離子體的膨脹過程,搭建出激光支持爆轟波的二維流場模型,得到等離子體控制方程之后,使用時空守恒元解元方法對等離子體的控制方程進行數(shù)值計算,得到等離子體溫度、壓強、速度及密度等隨時間、空間變化的情況。本文使用了MATLAB進行結(jié)果仿真,通過仿真分析得到了一系列激光參數(shù)與激光支持爆轟波之間的關(guān)系,為了更好地利用激光支持爆轟波力學(xué)毀傷的效果,除了提高激光功率密度以外,還需要針對不同的目標(biāo)材料,對激光脈寬、脈沖間隔進行合理的設(shè)計。比較相同功率密度條件下的單脈沖ns激光和多脈沖ns激光入射情況,得到多脈沖情況下靶面沖量累計較大、產(chǎn)生的力學(xué)損傷效果會較明顯,最佳脈沖間隔與脈沖寬度、光強大小、目標(biāo)材料等因素有關(guān)。
[Abstract]:With the development of laser theory, a series of disciplines supported by laser-material interaction physics have been derived. When laser acts on the target, a series of physical and chemical changes will occur on the surface of the target, which will change the properties of the target material and even cause a series of damage to the target material. In this series of changes, first the material is heated and melted, then the plasma is vaporized, and the plasma continues to absorb laser energy to form laser-supported detonation waves. Therefore, this series of changes are indirectly or directly related to the laser-supported detonation wave, so it is indispensable to study the laser-supported detonation wave and to analyze the influence of laser parameters on it. In this paper, we use ns laser pulse to irradiate aluminum plate, describe the whole process from laser supported detonation wave initiation to laser supported detonation wave formation, and explain the laser absorption process of matter in this process. The basic theory of laser-supported detonation wave is analyzed, and then a theoretical model for parameter analysis of short-pulse laser-supported detonation wave is constructed, through which the governing equation of plasma is derived. For the whole laser-supported detonation wave formation process, the C-J model is used to analyze the initial state of the plasma, and a series of parameters of the plasma during the initiation stage are determined. Then according to the process of plasma expansion, a two-dimensional flow field model of laser supporting detonation wave is built. After the plasma control equation is obtained, the time-space conservation element solution element method is used to numerically calculate the plasma control equation. The variation of plasma temperature, pressure, velocity and density with time and space are obtained. In this paper, MATLAB is used to simulate the results, and the relationship between a series of laser parameters and laser-supported detonation wave is obtained through simulation analysis. In order to make better use of laser to support the mechanical damage of detonation wave, Besides increasing laser power density, the laser pulse width and pulse interval should be reasonably designed for different target materials. Comparing the incidence of monopulse ns laser and multi-pulse ns laser at the same power density, the cumulative impulse of target surface is larger under the condition of multi-pulse, and the mechanical damage effect is obvious, the optimum pulse interval and pulse width are obtained. Light intensity, target material and other factors.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TN249
本文編號：2181917
[Abstract]:With the development of laser theory, a series of disciplines supported by laser-material interaction physics have been derived. When laser acts on the target, a series of physical and chemical changes will occur on the surface of the target, which will change the properties of the target material and even cause a series of damage to the target material. In this series of changes, first the material is heated and melted, then the plasma is vaporized, and the plasma continues to absorb laser energy to form laser-supported detonation waves. Therefore, this series of changes are indirectly or directly related to the laser-supported detonation wave, so it is indispensable to study the laser-supported detonation wave and to analyze the influence of laser parameters on it. In this paper, we use ns laser pulse to irradiate aluminum plate, describe the whole process from laser supported detonation wave initiation to laser supported detonation wave formation, and explain the laser absorption process of matter in this process. The basic theory of laser-supported detonation wave is analyzed, and then a theoretical model for parameter analysis of short-pulse laser-supported detonation wave is constructed, through which the governing equation of plasma is derived. For the whole laser-supported detonation wave formation process, the C-J model is used to analyze the initial state of the plasma, and a series of parameters of the plasma during the initiation stage are determined. Then according to the process of plasma expansion, a two-dimensional flow field model of laser supporting detonation wave is built. After the plasma control equation is obtained, the time-space conservation element solution element method is used to numerically calculate the plasma control equation. The variation of plasma temperature, pressure, velocity and density with time and space are obtained. In this paper, MATLAB is used to simulate the results, and the relationship between a series of laser parameters and laser-supported detonation wave is obtained through simulation analysis. In order to make better use of laser to support the mechanical damage of detonation wave, Besides increasing laser power density, the laser pulse width and pulse interval should be reasonably designed for different target materials. Comparing the incidence of monopulse ns laser and multi-pulse ns laser at the same power density, the cumulative impulse of target surface is larger under the condition of multi-pulse, and the mechanical damage effect is obvious, the optimum pulse interval and pulse width are obtained. Light intensity, target material and other factors.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TN249
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