本文選題：臭氧發(fā)生 + 脈沖介質(zhì)阻擋放電　； 參考：《南昌大學(xué)》2017年碩士論文

【摘要】：由于脈沖介質(zhì)阻擋放電(Dielectric Barrier Discharge,DBD)是將能量在時(shí)間尺度上進(jìn)行壓縮,可以在極短時(shí)間內(nèi)產(chǎn)生高功率和高能電子,從而使流光均勻分布,促進(jìn)流光放電的發(fā)展。因此,脈沖DBD成為臭氧發(fā)生領(lǐng)域中的一個(gè)研究熱點(diǎn)。許多學(xué)者通過改變電極結(jié)構(gòu),電壓形式等方法,對脈沖DBD進(jìn)行了深入的研究。雖然在一定程度上提高了臭氧產(chǎn)率,但是由于實(shí)驗(yàn)條件的限制,脈沖DBD機(jī)理還并不完善。因此,本文對納秒脈沖DBD臭氧發(fā)生建立一維流體動(dòng)力學(xué)仿真模型,模型中考慮了12種粒子和65個(gè)化學(xué)反應(yīng)。同時(shí),搭建納秒脈沖DBD臭氧發(fā)生的實(shí)驗(yàn)平臺,通過對比實(shí)驗(yàn)測量和模擬計(jì)算得到的電壓-電流,驗(yàn)證了模型的正確性。在驗(yàn)證模型正確的基礎(chǔ)上,對脈沖DBD臭氧發(fā)生的放電特性和能量傳遞機(jī)理開展系統(tǒng)的研究,得到的主要結(jié)論如下:1)首先對單次脈沖DBD臭氧發(fā)生進(jìn)行數(shù)值模擬,模擬結(jié)果發(fā)現(xiàn),一個(gè)脈沖電壓周期出現(xiàn)兩次極性相反的放電,分別位于電壓的上升階段和下降沿階段。在電流密度上升階段,折合電場強(qiáng)度和平均電子能量在陰極鞘獲得最大值,而電子密度則在鞘層外獲得最大值。隨著放電的發(fā)展,三者的峰值都在不斷增加并不斷向陰極運(yùn)動(dòng),同時(shí)陰極鞘也在不斷的變窄。在電流密度下降階段,陽極附近的折合電場強(qiáng)度和平均電子能量有所上升,放電空間其他位置的折合電場強(qiáng)度、平均電子能量和電子密度都在逐漸減小。另外還發(fā)現(xiàn)脈沖DBD一次放電的過程中,輸入能量的19.4%被電子吸收,其中41.6%的能量被用于維持產(chǎn)生臭氧反應(yīng)所需要的能量。2)通過系統(tǒng)地研究脈沖參數(shù)對脈沖DBD特性的影響,結(jié)果發(fā)現(xiàn)電流密度、電暈起始電壓和電流密度峰值時(shí)刻的電子密度、平均電子能量都隨著脈沖電壓幅值的升高而不斷增加。當(dāng)脈沖電壓上升時(shí)間增加時(shí),一次放電的電流密度隨之減小,而二次放電的電流密度則隨之增加,另外電暈起始電壓和電流密度峰值時(shí)刻的電子密度、平均電子能量都是隨之不斷減小。脈寬的變化對一次放電電流密度沒有影響,但是二次放電的電流密度則隨著脈寬的增加而逐漸降低。
[Abstract]:Since the pulse dielectric barrier discharge (DDBD) compresses energy on a time scale, it can produce high power and high energy electrons in a very short time, thus uniform distribution of streamer and promote the development of streamer discharge. Therefore, pulsed DBD has become a hot spot in ozone generation field. Many scholars have studied pulse DBD deeply by changing electrode structure and voltage form. Although the ozone yield is improved to some extent, the mechanism of pulsed DBD is not perfect due to the limitation of experimental conditions. Therefore, a one-dimensional hydrodynamic simulation model for nanosecond pulsed DBD ozone generation is established, in which 12 kinds of particles and 65 chemical reactions are considered in the model. At the same time, the experimental platform of nanosecond pulse DBD ozone generation is built, and the correctness of the model is verified by comparing the voltage-current obtained by experimental measurement and simulation calculation. Based on the correctness of the model, the discharge characteristics and energy transfer mechanism of pulsed DBD ozone are systematically studied. The main conclusions are as follows: (1) first, numerical simulation of monopulse DBD ozone generation is carried out, and the simulation results show that, Two discharges with opposite polarity occur in a pulse voltage cycle, which are located at the rising and descending stages of the voltage, respectively. At the stage of increasing current density, the maximum value of the reduced electric field intensity and the average electron energy are obtained in the cathode sheath, while the maximum electron density is obtained outside the sheath. With the development of discharge, the peak value of the three is increasing and moving to the cathode, and the cathode sheath is also becoming narrower. At the stage of decreasing current density, the electric field intensity and the average electron energy near the anode increased, while the electric field intensity, the average electron energy and the electron density at other positions in the discharge space decreased gradually. It was also found that 19.4% of the input energy was absorbed by electrons during the primary discharge of pulsed DBD, of which 41.6% of the energy was used to maintain the energy required to produce ozone reaction.) the effects of pulse parameters on the characteristics of pulsed DBD were systematically studied. The results show that the electron density and the average electron energy at the peak moment of current density, corona initial voltage and current density increase with the increase of pulse voltage amplitude. When the rise time of pulse voltage increases, the current density of primary discharge decreases, and the current density of secondary discharge increases. In addition, the electron density at the peak moment of corona initial voltage and current density increases. The average electron energy decreases with it. The change of pulse width has no effect on the current density of primary discharge, but the current density of secondary discharge decreases with the increase of pulse width.
【學(xué)位授予單位】：南昌大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TQ123.2

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