本文選題：激光傳輸 + 內(nèi)通道��； 參考：《中國科學(xué)院大學(xué)(中國科學(xué)院光電技術(shù)研究所)》2017年碩士論文

【摘要】：激光在內(nèi)通道中傳輸時,通道內(nèi)的氣體及光學(xué)、結(jié)構(gòu)元件會吸收激光能量,使內(nèi)通道中產(chǎn)生熱積累,出口處產(chǎn)生像差,降低激光遠(yuǎn)場的能量集中度。本文研究激光在內(nèi)通道中傳輸?shù)墓鈭觥⒘鲌黾盁徇吔鐚玉詈戏椒?對激光在不同結(jié)構(gòu)內(nèi)通道傳輸時產(chǎn)生的熱效應(yīng)綜合分析,能夠高效地對內(nèi)通道光傳輸質(zhì)量進(jìn)行評估。課題基于流體力學(xué)方程組和光傳輸方程,利用現(xiàn)有的計算流體力學(xué)軟件FLUENT對激光在內(nèi)通道傳輸中的流場進(jìn)行求解,然后自定義程序?qū)⒐鈭鲆詿嵩葱问郊尤肓鲌觥＝⒘送ㄓ玫募す鈨?nèi)通道光場、流場耦合分析模型。首先對普通直管、周期抽氣和雙層抽氣三種內(nèi)通道結(jié)構(gòu)進(jìn)行分析比較,仿真結(jié)果表明,普通直管中管壁熱邊界層會擴(kuò)散至主光路,熱積累溫度最高,主光路最大溫升達(dá)到0.7K;周期抽氣內(nèi)通道熱積累及出口處像差較小,但工程實現(xiàn)難度較高;采用雙層抽氣結(jié)構(gòu)熱邊界層控制最好,主光路溫升僅為0.1K,出口處像差也較小,為理想的內(nèi)通道結(jié)構(gòu)。接著介紹了內(nèi)通道中反射鏡在激光輻照下仿真分析,通過有限元分析熱力耦合,比較了硅、藍(lán)寶石、碳化硅和熔石英四種基底材料的反射鏡在相同能流密度的陣列激光輻照下的溫度分布和面形變化,結(jié)果表明,硅和碳化硅反射鏡溫升及面形像差較小。以硅鏡為例,分別對陣列和中空激光光束輻照下的反射鏡數(shù)值仿真得到,陣列激光輻照下溫升及像差較大,這對像差校正提出更高的要求。開展了激光在復(fù)雜雙層內(nèi)通道流場傳輸時產(chǎn)生的氣體、管壁和鏡面熱效應(yīng)綜合仿真分析。首先對流場結(jié)構(gòu)進(jìn)行高質(zhì)量的結(jié)構(gòu)化網(wǎng)格劃分,在僅考慮氣體熱效應(yīng)和氣體及管壁鏡面兩種情況下,對無通風(fēng)內(nèi)通道熱效應(yīng)進(jìn)行仿真,然后對通入氣體后的內(nèi)通道流場及光場計算。結(jié)果表明,在通入氣體情況下出口處相位PV值要比無通氣情況有量級上的下降。通氣情況下數(shù)值計算結(jié)果與實驗測量結(jié)果相符。根據(jù)已驗證的仿真模型對不同入口氣體流量情況下數(shù)值計算,優(yōu)化出較為合理的氣體入口流量,為內(nèi)通道熱管理工程實現(xiàn)提供了理論分析和數(shù)據(jù)支撐。
[Abstract]:When the laser is transmitted in the inner channel, the gas and optics in the channel and the structural elements will absorb the laser energy, which will lead to heat accumulation in the inner channel and aberration at the exit, thus reducing the energy concentration in the far field of the laser. In this paper, the coupling method of light field, flow field and thermal boundary layer is studied. The thermal effect of laser propagating in different internal channels is analyzed synthetically, and the quality of optical transmission in inner channel can be evaluated efficiently. Based on the fluid dynamics equations and optical transmission equations, the flow field in the laser inner channel is solved by using the existing computational fluid dynamics software fluent, and then the light field is added into the flow field in the form of heat source by custom program. A general coupling analysis model of laser inner channel light field and flow field is established. First of all, the structure of three internal channels, namely, ordinary straight pipe, periodic air extraction and double-layer air extraction, are analyzed and compared. The simulation results show that the thermal boundary layer of the wall of the pipe will diffuse to the main light path, and the heat accumulation temperature is the highest. The maximum temperature rise of the main light path is 0.7K, the thermal accumulation and the aberration at the exit of the periodic pumping channel are small, but the engineering implementation is more difficult, the heat boundary layer of the double-layer exhaust structure is the best, the temperature rise of the main light path is only 0.1K, and the aberration at the exit is smaller. It is an ideal internal channel structure. Then the simulation analysis of the mirror in the inner channel under laser irradiation is introduced, and the comparison of silicon and sapphire by finite element analysis is given. The temperature distribution and surface shape change of the mirrors of silicon carbide and fused quartz under the same energy flow density array laser irradiation show that the temperature rise and surface difference of silicon and silicon carbide mirrors are small. Taking silicon mirror as an example, the numerical simulation of reflector irradiated by array and hollow laser beam shows that the temperature rise and aberration are larger under array laser irradiation, which puts forward higher requirements for aberration correction. The thermal effects of gas, tube wall and mirror surface produced by laser propagation in a complex double-layer inner channel are simulated and analyzed. First of all, the flow field structure is divided into high quality structured meshes. The thermal effects of the inner passage without ventilation are simulated by considering only the thermal effect of gas and the mirror surface of the tube wall. Then the flow field and light field of the inner channel are calculated. The results show that the value of phase PV at the exit is lower than that in the case of no ventilation. The numerical results under ventilation are in agreement with the experimental results. According to the verified simulation model, the reasonable inlet gas flow is optimized, which provides theoretical analysis and data support for the thermal management engineering of the inner channel.
【學(xué)位授予單位】：中國科學(xué)院大學(xué)(中國科學(xué)院光電技術(shù)研究所)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN24

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 陳文韜;高云國;邵帥;劉旭堂;孫毅;;大口徑寬波段激光發(fā)射通道的防塵方法[J];紅外與激光工程;2015年10期

2 陳文韜;高云國;邵帥;;大口徑寬波段激光發(fā)射通道的正壓密封[J];光學(xué)精密工程;2015年08期

3 聶山鈞;郭勁;邵俊峰;王挺峰;湯偉;;激光輻照下鍍鉻介質(zhì)高吸收鏡的熱變形[J];中國光學(xué);2015年01期

4 胡鵬;蘇華;安建祝;張飛舟;;封閉管道中熱耦合效應(yīng)對激光傳輸?shù)挠绊慬J];強(qiáng)激光與粒子束;2013年07期

5 胡鵬;安建祝;張飛舟;;封閉水平管道中氣體壓強(qiáng)對激光傳輸?shù)挠绊慬J];中國激光;2013年07期

6 孫運(yùn)強(qiáng);習(xí)鋒杰;許曉軍;陸啟生;劉順發(fā);王繼紅;金鋼;陳洪斌;;復(fù)雜通道內(nèi)激光傳輸?shù)臍怏w熱效應(yīng)[J];強(qiáng)激光與粒子束;2011年07期

7 孫運(yùn)強(qiáng);習(xí)鋒杰;陳洪斌;劉順發(fā);王繼紅;許曉軍;陸啟生;;內(nèi)通道氣簾的設(shè)計與分析[J];激光與光電子學(xué)進(jìn)展;2011年05期

8 孫運(yùn)強(qiáng);習(xí)鋒杰;許曉軍;劉順發(fā);王繼紅;陳洪斌;陸啟生;;內(nèi)通道流場與光場能量耦合的數(shù)值模擬[J];中國激光;2011年02期

9 余亮英;朱海紅;程祖海;曹華梁;;強(qiáng)激光反射鏡體結(jié)構(gòu)對鏡面熱變形的影響[J];華中科技大學(xué)學(xué)報(自然科學(xué)版);2007年06期

10 柳建;王世慶;金鋼;李樹民;劉順發(fā);;吹氣抑制氣體熱效應(yīng)時管道結(jié)構(gòu)對光傳輸?shù)挠绊慬J];強(qiáng)激光與粒子束;2007年03期

相關(guān)博士學(xué)位論文 前2條

1 陳文韜;大口徑多波段激光發(fā)射內(nèi)通道的正壓密封方法研究[D];中國科學(xué)院研究生院(長春光學(xué)精密機(jī)械與物理研究所);2015年

2 孫運(yùn)強(qiáng);激光內(nèi)通道傳輸?shù)臍怏w熱效應(yīng)研究[D];國防科學(xué)技術(shù)大學(xué);2011年

相關(guān)碩士學(xué)位論文 前1條

1 何宴;大口徑輕質(zhì)主鏡熱邊界層分析與控制[D];中國科學(xué)院研究生院（光電技術(shù)研究所）;2014年

，

本文編號：2012395