發(fā)布時間：2018-10-23 21:24

【摘要】：大氣等離子體作為一種常見的等離子體,以其低成本、易生成等優(yōu)點在材料加工、冶金切割、熔斷焊接以及醫(yī)療殺菌等方面有著廣泛應(yīng)用。本文基于Eindhoven模型,結(jié)合Giuliano提出的配分函數(shù)計算方法對大氣等離子體的組分和折射率進行了計算,并基于莫爾偏折對大氣電弧進行了溫度診斷。配分函數(shù)是關(guān)系組分結(jié)果是否準確的重要參數(shù)。本文采用Giuliano分組法計算了大氣等離子體的原子及離子配分函數(shù),并且與傳統(tǒng)的半經(jīng)驗延展法結(jié)果對比,論證了使用Giuliano分組法代替半經(jīng)驗延展法在本文論述條件下的可行性;分子方面,本文采用了Mayer提出的簡化計算方法計算了大氣等離子體分子及其離子的配分函數(shù),并與莫爾斯勢能法進行了比較,論證了使用Mayer簡化法代替莫爾斯勢能法在本文論述條件下的可行性。組分是對大氣等離子體光學(xué)參數(shù)及溫度分布進行研究的前提。本文基于Eindhoven模型對大氣等離子體組分進行了計算,其中,Giuliano提出的分組法被應(yīng)用于配分函數(shù)的計算中,極大程度地簡化了 Eindhoven方程組的階數(shù),同時,使用了兩種簡化配分函數(shù)算法計算出了它們各自的組分值。在格拉斯通戴爾公式的基礎(chǔ)上,依據(jù)統(tǒng)一的折射率計算模型,計算得到了折射率溫度曲線。同時對比了考慮離子對折射率貢獻與否對最終折射率結(jié)果造成的差異,并給出了忽略離子的溫度適用范圍。實驗方面,搭建了莫爾偏折實驗平臺,用以測量大氣電弧等離子體的折射率分布。通過將折射率分布與不同配分函數(shù)處理方法計算的折射率溫度曲線進行反演,得到了大氣電弧的溫度分布。另一方面,搭建了光譜分析實驗平臺對大氣電弧進行溫度測量,從側(cè)面印證了莫爾偏折實驗結(jié)果的準確性。最終本文對不同配分函數(shù)處理方法得到的折射率溫度曲線及溫度分布進行了對比分析,得到了不同配分函數(shù)處理方法各自的適用范圍。結(jié)果表明,三種配分函數(shù)處理方法在1標準大氣壓12000K以下都能夠進行較為準確的溫度診斷。在折射率方面,采用簡化比值法的結(jié)果僅在溫度低于8600K與17040K-21410K間和分組法的結(jié)果誤差小于1%;忽略高能級法與Giuliano分組法除了在10910K-11410K和14680K-21420K產(chǎn)生的誤差大于1%外,其余溫度區(qū)間結(jié)果都與Giuliano分組法的折射率結(jié)果十分吻合。
[Abstract]:As a common plasma, atmospheric plasma has been widely used in material processing, metallurgical cutting, welding and medical sterilization for its advantages of low cost and easy generation. Based on the Eindhoven model and the partition function method proposed by Giuliano, the composition and refractive index of atmospheric plasma are calculated, and the temperature of atmospheric arc is diagnosed based on moire deflection. Partition function is an important parameter in relation to the accuracy of component results. In this paper, the atomic and ion partition functions of atmospheric plasma are calculated by Giuliano grouping method, and compared with the results of traditional semi-empirical extension method, the feasibility of using Giuliano grouping method instead of semi-empirical extension method in this paper is demonstrated. In molecular terms, the partition functions of atmospheric plasma molecules and their ions are calculated by using the simplified calculation method proposed by Mayer and compared with the Morse potential energy method. The feasibility of using Mayer simplified method to replace Morse potential energy method under the conditions discussed in this paper is demonstrated. Component is the premise of studying the optical parameters and temperature distribution of atmospheric plasma. In this paper, the components of atmospheric plasma are calculated based on Eindhoven model. Among them, the grouping method proposed by Giuliano is applied to the calculation of partition function, which greatly simplifies the order of Eindhoven equations. Two simplified partition function algorithms are used to calculate their respective component values. On the basis of Grantondale's formula, the temperature curve of refractive index is calculated according to the unified refractive index calculation model. At the same time, the difference between the final refractive index results by considering the contribution of ion to refractive index is compared, and the applicable range of temperature for neglecting ions is given. In the aspect of experiment, an experimental platform of moire deflection is built to measure the refractive index distribution of atmospheric arc plasma. The temperature distribution of atmospheric arc is obtained by inversion of refractive index distribution and refractive index temperature curve calculated by different partition function. On the other hand, the experimental platform of spectral analysis is built to measure the temperature of atmospheric arc, which verifies the accuracy of the experimental results of Mohr deflection. Finally, the temperature curve and temperature distribution of refractive index obtained by different partition function processing methods are compared and analyzed, and the applicable range of different partition function processing methods is obtained. The results show that the three partition function processing methods can be used to diagnose temperature accurately below 1 standard atmospheric pressure of 12000K. In terms of refractive index, the results of simplified ratio method are only less than 1 when the temperature is lower than 8600 K and 17040K-21410K and the error of grouping method is less than 1, ignoring that the error between high energy level method and Giuliano group method is more than 1% except in 10910K-11410K and 14680K-21420K. The results of other temperature ranges are in good agreement with the refractive index results of Giuliano grouping method.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：O53

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