本文關(guān)鍵詞：汽車尾氣余熱溫差發(fā)電裝置優(yōu)化與分析　出處：《沈陽理工大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 尾氣余熱回收 溫差發(fā)電 模擬分析 翅片結(jié)構(gòu) 溫度均勻性

【摘要】：隨著汽車工業(yè)的迅猛發(fā)展,全球經(jīng)濟(jì)的發(fā)展得到了快速地推進(jìn),與此同時(shí),大量的石油資源也消耗得幾近枯竭,并產(chǎn)生過量溫室氣體及NOX、PM等污染物排放。汽油是汽車的主要?jiǎng)恿δ茉?在實(shí)際使用中僅利用了大致30%,40%左右都以汽車尾氣的形式排放掉和被冷卻系統(tǒng)冷卻掉。本文涉及一種圓筒式汽車尾氣溫差發(fā)電裝置,利用溫差發(fā)電技術(shù)回收汽車尾氣中的余熱。換熱器是溫差發(fā)電裝置熱端的主要部件,其表面溫度的大小與均勻程度對溫差發(fā)電裝置的輸出有很大的影響。本文針對廢熱回收再利用,主要對溫差發(fā)電裝置換熱器以及該裝置整體結(jié)構(gòu)展開了相關(guān)的研究。本文根據(jù)換熱器內(nèi)置翅片結(jié)構(gòu)的不同,提出了兩種換熱器,即螺旋斜翅片換熱器和螺旋線翅片換熱器,主要研究螺旋斜翅片螺旋角、螺旋線翅片螺距、翅片厚度和翅片高度對換熱器熱性能的影響,其換熱器熱性能是以溫度均勻性系數(shù)、換熱器背壓和壁面平均溫度為指標(biāo)來體現(xiàn)的。在CATIA三維建模軟件中建立了上述帶有不同的翅片結(jié)構(gòu)的換熱器模型,并導(dǎo)入到ANSYS Workbench仿真平臺(tái)中,建立換熱器流固耦合共軛換熱計(jì)算模型,通過GT-Suite獲取指定的發(fā)動(dòng)機(jī)工況下的邊界條件,利用CFD軟件CFX展開數(shù)值仿真研究。通過翅片結(jié)構(gòu)對換熱器熱性能影響的仿真結(jié)果,對螺旋線翅片換熱器進(jìn)行了優(yōu)化,提出了變螺距式螺旋線翅片換熱器,對上述新、舊換熱器做了相同的熱分析過程。最后,對帶有該變螺距式螺旋線翅片換熱器的溫差發(fā)電裝置模型進(jìn)行了模擬仿真,估算出了該裝置能產(chǎn)出的最大電能。本文的研究方法為以后汽車尾氣余熱溫差發(fā)電裝置的設(shè)計(jì)和改進(jìn)提供了方法指導(dǎo)。
[Abstract]:With the rapid development of automobile industry, the development of global economy has been rapidly promoted, at the same time, a large number of oil resources are almost depleted, and produce excessive greenhouse gas and NOX. Pm and other pollutants emissions. Gasoline is the main vehicle power energy, in practical use only about 30%. About 40% is emitted in the form of automobile exhaust gas and cooled by cooling system. This paper relates to a cylinder type thermoelectric device of automobile exhaust gas. The heat exchanger is the main component in the hot end of thermoelectric power generation unit, which uses thermoelectric technology to recover the waste heat from automobile exhaust gas. The size and uniformity of the surface temperature have a great influence on the output of thermoelectric equipment. This paper aims at waste heat recovery and reuse. This paper mainly studies the heat exchanger of the thermoelectric unit and the whole structure of the unit. In this paper, two kinds of heat exchangers are put forward according to the difference of the inner fin structure of the heat exchanger. The helical oblique fin heat exchanger and the helical fin heat exchanger mainly study the influence of helical angle helical angle helical fin pitch fin thickness and fin height on the thermal performance of the heat exchanger. The thermal performance of the heat exchanger is based on the coefficient of temperature uniformity. The back pressure of heat exchanger and the average temperature of the wall are taken as the index. The heat exchanger model with different fin structure is established in CATIA 3D modeling software. The model of fluid-solid coupling conjugate heat transfer of heat exchanger is established by introducing it into ANSYS Workbench simulation platform, and the boundary conditions under specified engine conditions are obtained by GT-Suite. The numerical simulation study was carried out by using CFD software CFX. The helical fin heat exchanger was optimized by the simulation results of the influence of fin structure on the thermal performance of the heat exchanger. The variable pitch helical fin heat exchanger is put forward. The same thermal analysis process is done for the new and old heat exchangers. Finally. The model of thermoelectricity generator with the variable pitch helical fin heat exchanger is simulated. The maximum electric energy produced by the device is estimated. The research method in this paper provides a method guidance for the design and improvement of the afterheat differential power generation device of automobile exhaust gas in the future.
【學(xué)位授予單位】：沈陽理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：U464.134.4;TM913

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本文編號：1381702