本文選題：LNG汽車　切入點(diǎn)：溫差發(fā)電模塊　出處：《太原理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：近年來(lái),我國(guó)汽車產(chǎn)業(yè)取得了飛速地發(fā)展，汽車已然成為人們?nèi)粘Ｉ畋夭豢缮俚慕煌üぞ撸S著汽車保有量的增加，導(dǎo)致燃料的需求不斷增加，同時(shí)汽車排放對(duì)環(huán)境造成的污染也不容忽視。為應(yīng)對(duì)這一系列問(wèn)題,各國(guó)政府不斷完善限制機(jī)動(dòng)車對(duì)環(huán)境污染的法律法規(guī),各種汽車先進(jìn)技術(shù)的研究單位也投資大量資金和科研力量進(jìn)行新型能量轉(zhuǎn)換裝置的開(kāi)發(fā)。 利用汽車廢熱進(jìn)行溫差發(fā)電的系統(tǒng)成為各大企業(yè)、高校及其研究機(jī)構(gòu)的關(guān)注熱點(diǎn)，該裝置可以將汽車排放的尾氣中的廢熱轉(zhuǎn)換為電能,有效地解決了內(nèi)燃機(jī)對(duì)燃料燃燒能量的利用率低的問(wèn)題，從另一個(gè)角度可以視為提高了汽車的燃油利用率,而且進(jìn)氣溫度的升高可以減少部分有害排氣的排放量,具有很好的應(yīng)用前景和重要的社會(huì)價(jià)值。 本文在對(duì)國(guó)內(nèi)外LNG汽車方面研究分析的基礎(chǔ)上,發(fā)現(xiàn)液化天然氣（LNG）汽車作為一種新能源汽車受到各國(guó)政府的大力推廣，但目前利用汽車尾氣廢熱的溫差發(fā)電系統(tǒng)存在的輸出功率小、轉(zhuǎn)換效率低等缺點(diǎn),而LNG汽車自身具備的低溫冷源為提高溫差發(fā)電裝置的輸出功率提供了良好的條件，但需要對(duì)溫差發(fā)電裝置在LNG汽車上的應(yīng)用可靠性及性能進(jìn)行分析，首先對(duì)裝置中與廢熱回收利用率緊密相關(guān)的換熱器進(jìn)行流-固耦合分析,仿真能夠通過(guò)多種方式來(lái)改善溫差發(fā)電模塊安裝表面的溫度分布情況，，分析其對(duì)傳統(tǒng)排氣系統(tǒng)的影響，為增大溫差發(fā)電模塊冷熱端的溫差提供有效途徑。以對(duì)流體力學(xué)的學(xué)習(xí)為前提,利用UG建立了三種不同內(nèi)部結(jié)構(gòu)的尾氣溫差發(fā)電裝置換熱器三維模型,運(yùn)用ANSYS Fluent有限元分析軟件進(jìn)行多物理場(chǎng)的耦合分析,據(jù)此分析汽車尾氣溫差發(fā)電裝置換熱器通道內(nèi)的高溫氣體流動(dòng)與傳熱過(guò)程。通過(guò)分析相關(guān)機(jī)構(gòu)的研究方法，獲得對(duì)應(yīng)的有限元模型和邊界條件,經(jīng)過(guò)軟件計(jì)算收斂后得到了三種換熱器溫度、壓力和流場(chǎng)仿真結(jié)果,對(duì)比光滑表面、“一”字肋片和“人”字肋片三種換熱器通道仿真結(jié)果，分析得到三者中最優(yōu)的換熱器結(jié)構(gòu)，得到其溫差發(fā)電模塊安裝表面的溫度分布云圖，確定合理的模塊安裝方式，為后續(xù)的仿真計(jì)算提供了基礎(chǔ)條件，并考慮接觸熱阻對(duì)模塊端面溫度的影響，從接觸熱阻影響因素著手對(duì)接觸傳熱進(jìn)行優(yōu)化。 另外，本文對(duì)該汽車尾氣溫差發(fā)電裝置進(jìn)行熱-固和熱-電耦合分析,加載換熱器熱-流耦合分析得到的溫度載荷,分析得到了汽車尾氣溫差發(fā)電器件的應(yīng)力和應(yīng)變?cè)茍D，并與以冷卻水為冷源的溫差發(fā)電單元仿真結(jié)果進(jìn)行對(duì)比，結(jié)果表明,本文所研究的汽車尾氣溫差發(fā)電裝置滿足使用要求,可以為今后的相關(guān)研究提供參考。
[Abstract]:In recent years, the automobile industry of our country has made the rapid development, the automobile has already become the essential vehicle of people's daily life, with the increase of the automobile quantity, the demand for fuel is increasing constantly. At the same time, the pollution caused by automobile emissions to the environment should not be ignored. In order to deal with this series of problems, the governments of various countries have constantly perfected the laws and regulations that limit the pollution caused by motor vehicles to the environment. All kinds of advanced automobile technology research units also invest a lot of funds and scientific research forces to develop new energy conversion devices. The system of thermoelectric power generation using automobile waste heat has become the focus of attention of enterprises, universities and their research institutions. The device can convert the waste heat from the exhaust gas of the automobile into electric energy. It effectively solves the problem of low utilization rate of fuel combustion energy in internal combustion engines. From another angle, it can be regarded as increasing the fuel efficiency of vehicles, and the increase of intake air temperature can reduce some harmful emissions. It has good application prospect and important social value. Based on the research and analysis of LNG vehicles at home and abroad, this paper finds that LNG vehicles as a new energy vehicle are popularized by the governments of various countries. However, the thermal power generation system using waste heat from automobile exhaust has some disadvantages, such as low output power, low conversion efficiency and so on. However, the low temperature cold source of LNG vehicle provides a good condition for improving the output power of thermoelectric device. However, it is necessary to analyze the reliability and performance of thermoelectric equipment in LNG vehicles. Firstly, the fluid-solid coupling analysis of heat exchangers which are closely related to the utilization ratio of waste heat recovery is carried out. The simulation can improve the temperature distribution on the installation surface of thermoelectric module in many ways, and analyze its influence on the traditional exhaust system. In order to increase the temperature difference between the cold and hot ends of the thermoelectricity generation module, a three-dimensional heat exchanger model of the tail gas thermoelectric unit with three different internal structures is established by using UG on the premise of the study of fluid mechanics. The coupling analysis of multiple physical fields is carried out by using ANSYS Fluent finite element analysis software, according to which the high temperature gas flow and heat transfer process in the heat exchanger channel of the automobile exhaust thermoelectric unit are analyzed. The corresponding finite element model and boundary conditions are obtained. The simulation results of temperature, pressure and flow field of three kinds of heat exchangers are obtained after the convergence of the software. The simulation results of three kinds of heat exchangers with smooth surface, "one" rib and "human" fin are compared. The optimal heat exchanger structure is obtained, the temperature distribution cloud diagram of the installation surface of the thermoelectricity generation module is obtained, and the reasonable installation mode of the module is determined, which provides the basic conditions for the subsequent simulation calculation. Considering the influence of contact thermal resistance on the end surface temperature of the module, the contact heat transfer is optimized from the contact thermal resistance factors. In addition, the thermo-solid and thermo-electric coupling analysis of the vehicle exhaust thermoelectricity generator is carried out, and the temperature load obtained from the thermal-flow coupling analysis of the heat exchanger is used to obtain the stress and strain cloud diagram of the thermoelectric device. The results are compared with the simulation results of thermoelectric units with cooling water as the cold source. The results show that the thermoelectric device of automobile exhaust gas in this paper can meet the requirements of application and can be used as a reference for the related research in the future.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U463.6;TM913

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 張忻;張久興;路清梅;張艷峰;劉延秦;劉旭;;氧化物熱電材料研究進(jìn)展[J];材料導(dǎo)報(bào);2004年02期

2 趙建云;朱冬生;周澤廣;王長(zhǎng)宏;陳宏;;溫差發(fā)電技術(shù)的研究進(jìn)展及現(xiàn)狀[J];電源技術(shù);2010年03期

3 賈磊;胡們;陳則韶;;溫差發(fā)電的熱力過(guò)程研究及材料的塞貝克系數(shù)測(cè)定[J];中國(guó)工程科學(xué);2005年12期

4 于廣;黃維軍;余流;張征;;車用內(nèi)置式溫差發(fā)電器換熱性能的數(shù)值模擬[J];節(jié)能技術(shù);2008年05期

5 張征;王能歡;;發(fā)動(dòng)機(jī)溫差發(fā)電仿真系統(tǒng)研究[J];節(jié)能技術(shù);2011年04期

6 張征,曾美琴,司廣樹(shù);溫差發(fā)電技術(shù)及其在汽車發(fā)動(dòng)機(jī)排氣余熱利用中的應(yīng)用[J];能源技術(shù);2004年03期

7 劉小平;張敏;劉晶;許彬;;商用軟件GAMBIT的解析和應(yīng)用[J];南京工業(yè)大學(xué)學(xué)報(bào)(自然科學(xué)版);2008年01期

8 鄧義斌;黃榮華;王兆文;程偉;;冷卻液溫度對(duì)天然氣發(fā)動(dòng)機(jī)性能影響試驗(yàn)[J];農(nóng)業(yè)機(jī)械學(xué)報(bào);2011年03期

9 邢號(hào)彬;范文;王計(jì)廣;陸磊;;汽車尾氣溫差發(fā)電裝置中熱電模塊的散熱方式研究[J];汽車零部件;2011年09期

10 徐立珍;李彥;楊知;陳昌和;;汽車尾氣溫差發(fā)電的實(shí)驗(yàn)研究[J];清華大學(xué)學(xué)報(bào)(自然科學(xué)版);2010年02期

相關(guān)博士學(xué)位論文 前1條

1 靳鵬;汽車尾氣熱電發(fā)電技術(shù)研究及應(yīng)用仿真[D];吉林大學(xué);2011年

本文編號(hào)：1559432