本文選題：燃?xì)廨啓C(jī) + 透平冷卻��； 參考：《清華大學(xué)》2015年博士論文

【摘要】：燃?xì)廨啓C(jī)作為一種高效清潔的動力裝備,隨著其熱效率的不斷提升,透平進(jìn)口溫度持續(xù)升高;冷卻技術(shù)成為先進(jìn)透平設(shè)計(jì)的關(guān)鍵之一�，F(xiàn)代先進(jìn)的透平冷卻結(jié)構(gòu)趨于復(fù)雜化、多樣化,綜合冷卻效果是各冷卻部件和多種傳熱方式共同作用的結(jié)果。隨著透平冷卻技術(shù)探索的深入,反映綜合因素影響的耦合傳熱特征,逐漸成為冷卻傳熱研究的重點(diǎn)。本文首先以端壁冷卻機(jī)理實(shí)驗(yàn)臺為基礎(chǔ)完成了多參數(shù)的流動傳熱測量,建立了端壁冷卻從流動到傳熱,從絕熱到耦合的全面且詳實(shí)的實(shí)驗(yàn)數(shù)據(jù)庫。對實(shí)驗(yàn)結(jié)果的分析表明,綜合冷卻效率和絕熱氣膜效率都會隨著冷氣流量的提升而明顯增高。比較綜合冷卻效率和絕熱氣膜效率可以發(fā)現(xiàn),由于內(nèi)部冷卻對流及固體導(dǎo)熱的作用,綜合冷卻效率分布更為均勻,氣膜冷卻主要影響近氣膜孔區(qū)域的綜合冷效分布。為分析耦合傳熱下綜合冷卻效率的多因素影響機(jī)理,本文構(gòu)建了能分離各局部冷卻參數(shù)影響的一維耦合傳熱模型;其適用性在與實(shí)驗(yàn)結(jié)果的比對中得到了驗(yàn)證。借助模型分析表明,各冷卻參數(shù)中,絕熱氣膜效率、內(nèi)部換熱系數(shù)、熱障涂層畢渥數(shù)與綜合冷卻效率正相關(guān),冷氣溫升系數(shù)、金屬畢渥數(shù)與綜合冷卻效率負(fù)相關(guān);熱障涂層的存在會同時(shí)削弱內(nèi)部和外部冷卻參數(shù)的敏感性;通過對綜合冷卻效率等值線圖的分析,可以進(jìn)一步得到各參數(shù)更細(xì)節(jié)的影響特征結(jié)論。比較無量綱參數(shù)相同的高-低溫工況實(shí)驗(yàn)結(jié)果,主流高溫使得綜合冷卻效率偏低;根據(jù)所發(fā)展的溫度修正預(yù)測方法,能夠?qū)囟鹊挠绊戇M(jìn)行修正。在高溫高濕環(huán)境中,輻射作用增強(qiáng),將對透平冷卻傳熱產(chǎn)生影響。對輻射因素影響的實(shí)驗(yàn)及數(shù)值研究表明,由于水蒸氣介質(zhì)輻射的作用,隨著主流高溫燃?xì)庵兴魵怏w積分?jǐn)?shù)每增加7%,平板綜合冷卻效率降低約0.02;熱障涂層在各組分工況下都有明顯的溫降效果,且燃?xì)獾乃羝吭礁?溫降效果越明顯。由于輻射在高溫高濕工況下的綜合作用,在透平冷卻設(shè)計(jì)中必須綜合考慮不同燃?xì)饨M分在導(dǎo)熱/對流/輻射耦合傳熱下的影響。本文以多工況變參數(shù)流動傳熱測量為基礎(chǔ),發(fā)展了相關(guān)數(shù)值模擬方法及理論模型,分析了包括各冷卻部件、不同溫度工況及輻射等多因素在耦合傳熱下的影響作用,揭示了透平冷卻耦合傳熱機(jī)理。
[Abstract]:As a kind of high efficiency and clean power equipment, the inlet temperature of gas turbine is rising with the increasing of its thermal efficiency, and the cooling technology has become one of the key points in the design of advanced turbine. The modern advanced turbine cooling structure tends to be complicated and diversified. The comprehensive cooling effect is the result of the joint action of various cooling parts and various heat transfer modes. With the further exploration of turbine cooling technology, the coupled heat transfer characteristics, which reflect the influence of comprehensive factors, have gradually become the focus of research on cooling heat transfer. In this paper, the multi-parameter flow heat transfer measurement is completed on the basis of the endwall cooling mechanism experimental bench, and a comprehensive and detailed experimental database of endwall cooling from flow to heat transfer and from adiabatic to coupling is established. The experimental results show that both the comprehensive cooling efficiency and the adiabatic film efficiency increase with the increase of the air flow rate. Compared with the comprehensive cooling efficiency and the adiabatic film efficiency, it is found that the distribution of the integrated cooling efficiency is more uniform due to the effect of internal cooling convection and solid heat conduction, and the film cooling mainly affects the comprehensive cooling efficiency distribution in the near film hole region. In order to analyze the multi-factor influence mechanism of integrated cooling efficiency under coupled heat transfer, a one-dimensional coupled heat transfer model which can separate the influence of local cooling parameters is constructed, and its applicability is verified by comparing with experimental results. The results of model analysis show that the adiabatic film efficiency, internal heat transfer coefficient, thermal barrier coating number and comprehensive cooling efficiency are positively correlated with the cooling parameters, and the temperature rise coefficient of cold air and the number of metal outings are negatively correlated with the comprehensive cooling efficiency. The existence of thermal barrier coatings will weaken the sensitivity of both internal and external cooling parameters. Compared with the experimental results of high and low temperature with the same dimensionless parameters, the mainstream high temperature makes the comprehensive cooling efficiency low, and the influence of temperature can be corrected according to the developed temperature correction prediction method. In high temperature and high humidity environment, the enhancement of radiation will affect the cooling and heat transfer of turbine. Experiments and numerical studies on the effects of radiation factors show that, due to the radiation of water vapor media, With the increase of steam volume fraction in mainstream high temperature gas, the comprehensive cooling efficiency of flat plate is decreased by about 0.02, and the thermal barrier coating has obvious effect of temperature drop under each working condition, and the higher the steam content of gas is, the more obvious the effect of temperature drop is. Due to the comprehensive effect of radiation under high temperature and high humidity conditions, the influence of different gas components on heat conduction / convection / radiation coupling heat transfer must be considered in turbine cooling design. In this paper, based on the measurement of flow heat transfer under various working conditions and variable parameters, the relevant numerical simulation methods and theoretical models are developed, and the effects of various factors, such as various cooling components, different temperature conditions and radiation, on coupled heat transfer are analyzed. The coupled heat transfer mechanism of turbine cooling is revealed.
【學(xué)位授予單位】：清華大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2015
【分類號】：TK471

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 鄭長鈞;;火電廠冷卻塔冷卻效率的調(diào)查與分析[J];電力建設(shè);1989年08期

2 原和朋;朱惠人;孔滿昭;;后臺階三維縫隙冷卻效率的數(shù)值模擬[J];燃?xì)廨啓C(jī)技術(shù);2006年04期

3 聶建豪;朱惠人;任戰(zhàn)鵬;;對層板冷卻效率隨主流流動方向變化的數(shù)值研究[J];機(jī)械與電子;2013年09期

4 崔福生;;“混流式”風(fēng)扇改善冷卻效率[J];長安大學(xué)學(xué)報(bào)(自然科學(xué)版);1981年01期

5 李彬,胡正義,林宇震,劉高恩;多斜孔壁整體冷卻效率實(shí)驗(yàn)研究[J];航空動力學(xué)報(bào);1999年02期

6 程波;劉X;李彬;楊靈;;復(fù)合冷卻結(jié)構(gòu)冷卻效率的試驗(yàn)研究[J];燃?xì)鉁u輪試驗(yàn)與研究;2007年04期

7 王智華,朱鈺;對TB 1734—86標(biāo)準(zhǔn)的修改建議[J];內(nèi)燃機(jī)車;1989年12期

8 李鋒,張青藩,何家德,王民升;離散孔板冷卻效率及其換熱規(guī)律的研究[J];航空動力學(xué)報(bào);1997年01期

9 李廣超;凌旭;寇志海;吳超林;張魏;;雙出口氣膜孔冷卻效率實(shí)驗(yàn)[J];航空動力學(xué)報(bào);2014年05期

10 李廣超;張魏;王成軍;彭大維;王建明;徐志暉;;葉片前緣雙出口孔射流冷卻效率數(shù)值模擬[J];航空動力學(xué)報(bào);2010年10期

相關(guān)會議論文 前1條

1 楊衛(wèi)華;賀宜紅;孫瑞嘉;李維;;不同葉片尾緣結(jié)構(gòu)冷卻效率的實(shí)驗(yàn)研究[A];中國航空學(xué)會第七屆動力年會論文摘要集[C];2010年

相關(guān)博士學(xué)位論文 前1條

1 李明飛;燃機(jī)透平冷卻耦合傳熱特性及多因素影響機(jī)理研究[D];清華大學(xué);2015年

相關(guān)碩士學(xué)位論文 前3條

1 凌旭;動葉葉頂隔板式迷宮間隙傳熱特性研究[D];沈陽航空航天大學(xué);2014年

2 吳志娟;燃燒室火焰筒壁面冷卻特性的研究[D];南京航空航天大學(xué);2013年

3 曹喜峰;層板外部氣膜冷卻特性研究[D];沈陽航空航天大學(xué);2015年

，

本文編號：1973093