【摘要】：微型燃燒器是微型熱光電(MTPV)系統(tǒng)的重要組成部分，整個(gè)MTPV系統(tǒng)的動(dòng)力輸出主要來(lái)自于光電池吸收的微型燃燒器外壁面高溫輻射出的輻射能，其好壞取決于微型燃燒器熱轉(zhuǎn)換效率的高低。微型燃燒器是以自然界分布廣泛的烴類化合物為燃料，具有結(jié)構(gòu)簡(jiǎn)單、單位體積能量大、能量轉(zhuǎn)換效率高等優(yōu)點(diǎn)。 研究工作針對(duì)微型燃燒器在各影響因素下的工作性能，通過(guò)改變多孔介質(zhì)的結(jié)構(gòu)、孔隙率、混合氣的流量以及混合比等方法對(duì)燃燒器輻射壁面的溫度分布和光譜性能進(jìn)行測(cè)量和分析。通過(guò)試驗(yàn)得出泡沫陶瓷多孔介質(zhì)在微型燃燒器內(nèi)的燃燒效果要優(yōu)于陶瓷小球多孔介質(zhì)，多孔介質(zhì)孔隙率過(guò)大或過(guò)小都不利于燃燒的發(fā)生�；旌蠚饬髁康脑黾釉谝欢ǔ潭壬显鰪�(qiáng)了微型燃燒器壁面的溫度。 為了分析研究微型燃燒器煙氣中HC和CO的含量，使其能夠滿足污染物排放的相關(guān)要求，在微型燃燒器的出口處添加了煙氣采集系統(tǒng)，針對(duì)不同流量、不同孔隙率、不同混合比等工況下煙氣中的HC和CO的含量進(jìn)了采集和分析，，尋找出既能滿足高轉(zhuǎn)換效率又能滿足低污染物排放的燃燒器工作工況。微燃燒器煙氣中有害成分HC和CO的含量都與微型燃燒器燃燒狀態(tài)有關(guān)，隨著混合氣流量的增加HC和CO的含量均呈現(xiàn)先降低后增加的趨勢(shì)，孔隙率的變化對(duì)兩者的影響相對(duì)復(fù)雜。 由于試驗(yàn)設(shè)備的限制，很多工況在試驗(yàn)臺(tái)架上無(wú)法進(jìn)行試驗(yàn)，微型燃燒器的內(nèi)部燃燒狀態(tài)以及各成分濃度分布情況也無(wú)法進(jìn)行測(cè)量，為了能夠分析這些因素對(duì)微型燃燒器工作狀態(tài)的影響，利用CFD計(jì)算模擬的方法。通過(guò)Fluent軟件建立合理的微型燃燒器物理模型，模擬出微型燃燒器在較多工況下的工作狀態(tài)以及內(nèi)部燃燒反應(yīng)的情況。與試驗(yàn)結(jié)果相結(jié)合，全面分析各因素對(duì)微型燃燒器工作狀態(tài)的影響，取得了較好的效果，為將來(lái)微型熱光電系統(tǒng)的研究指明了方向。
[Abstract]:The micro burner is an important part of the micro thermoelectric (MTPV) system. The power output of the whole MTPV system comes mainly from the radiation energy emitted from the external wall of the micro burner absorbed by the photocell. Its quality depends on the heat conversion efficiency of the micro burner. The micro burner is based on hydrocarbon compounds which are widely distributed in nature. It has the advantages of simple structure, large unit volume energy and high energy conversion efficiency. By changing the structure and porosity of porous media, the study aims at the performance of micro burners under various influence factors. The temperature distribution and spectral properties of the radiating wall of the burner were measured and analyzed by the mixture flow rate and mixing ratio. The experimental results show that the combustion effect of porous media in micro burners is better than that in porous media with ceramic pellets. The porosity of porous media is too large or too small is not conducive to combustion. To some extent, the temperature of the wall of the micro burner is increased with the increase of the mixture flow rate. In order to analyze the content of HC and CO in the flue gas of micro burners so as to meet the requirements of pollutant emission, a flue gas acquisition system was added at the outlet of the micro burners, aiming at different flow rates and different porosity. The contents of HC and CO in flue gas under different mixing ratios were collected and analyzed to find out a burner that can meet both high conversion efficiency and low pollutant emission. The contents of HC and CO in micro combustor flue gas are all related to the combustion state of micro burner. With the increase of mixture flow rate, HC and CO content both decrease first and then increase, and the effect of porosity on them is relatively complex. Because of the limitation of the test equipment, many working conditions can not be tested on the test bench, and the combustion state and the distribution of the components in the micro burner can not be measured. In order to analyze the influence of these factors on the working state of the micro burner, the simulation method of CFD is used. A reasonable physical model of micro burner is established by Fluent software, and the working state and internal combustion reaction of micro burner under more working conditions are simulated. Combined with the experimental results, the influence of various factors on the working state of the micro burner is comprehensively analyzed, and good results are obtained, which points out the direction for the future study of the micro thermoelectric system.
【學(xué)位授予單位】：河南科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM914.4

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