本文關(guān)鍵詞：動態(tài)非均勻熱流密度下熱電器件的熱—應(yīng)力—發(fā)電性能研究　出處：《華中科技大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 熱電發(fā)電器件 發(fā)電 效率 熱應(yīng)力 非穩(wěn)態(tài)

【摘要】：溫差發(fā)電技術(shù)作為一種新能源技術(shù),各方面的理論研究和應(yīng)用已開展了近一個世紀(jì),可以作為緩解能源危機(jī)的有效手段;同時,由于溫差發(fā)電技術(shù)具有無噪音,無介質(zhì)泄漏、零排放的優(yōu)點,決定了其對環(huán)境的友好。此外,溫差發(fā)電器還具有移動方便、使用壽命長、維護(hù)成本低、重量輕、無磨損、體積小等優(yōu)點,故近年來已引起廣泛關(guān)注。本論文主要建立熱電發(fā)電器的熱-電-應(yīng)力耦合模型,分析了熱電發(fā)電器在不同工況下的電能輸出和應(yīng)力特性,同時分析了對熱電器件電能輸出和應(yīng)力分布特性的影響因素。首先建立熱電器件的傳熱-發(fā)電-應(yīng)力耦合數(shù)學(xué)模型,分析了熱電材料物性參數(shù)隨溫度變化對輸出特性的影響,熱輻射對輸出特性的影響。然后分析了非均勻熱流密度對輸出特性的影響,基于相同熱流量下分析不同的熱流集中度的影響。通過選取模塊不同的橫截面可以看到在非均勻熱流密度下模塊內(nèi)部的溫度云圖,進(jìn)一步分析非均勻熱流密度對其效率產(chǎn)生影響的原因。研究了熱電器件的啟停特性。研究穩(wěn)態(tài)輸出特性后又研究了其非穩(wěn)態(tài)輸出特性,觀察了物性參數(shù)、熱輻射對溫度和輸出電壓影響的過程,同時對比非均勻熱流密度的施加方式,高斯熱流密度和非均勻熱流密度。其次研究了熱電器件的熱應(yīng)力結(jié)果,從熱應(yīng)力模擬結(jié)果云圖可得到該模塊熱應(yīng)力最大節(jié)點,結(jié)果表明模塊最大熱應(yīng)力節(jié)點在銅板和熱電材料接觸直角處,追蹤該節(jié)點進(jìn)行非穩(wěn)態(tài)分析,得到從開始到穩(wěn)態(tài)過程該節(jié)點熱應(yīng)力變化。通過選取模塊內(nèi)的一系列截面,得到模塊熱應(yīng)力形成過程以及最有可能發(fā)生熱應(yīng)力破壞的區(qū)域,觀察其熱應(yīng)變云圖和位移云圖。同時還通過非穩(wěn)態(tài)分析的云圖結(jié)果得到其熱應(yīng)力形成過程。然后研究了銅板厚度和聚熱層厚度對熱應(yīng)力大小的影響,以及對發(fā)電穩(wěn)定性,應(yīng)力穩(wěn)定性的影響,以及熱流密度,溫度和熱應(yīng)力之間的相位關(guān)系。
[Abstract]:As a new energy technology, thermoelectric power generation technology has been studied and applied in various fields for nearly a century, which can be used as an effective means to alleviate the energy crisis. At the same time, the thermoelectricity technology has the advantages of no noise, no medium leakage, zero emission, which determines its environmental friendliness. In addition, the thermoelectric generator also has the advantages of convenient movement, long service life and low maintenance cost. Because of its advantages of light weight, no wear and small volume, it has attracted much attention in recent years. In this paper, the thermoelectric-stress coupling model of thermoelectric generator is established. The characteristics of power output and stress of thermoelectric generator under different working conditions are analyzed. At the same time, the influence factors on the characteristics of power output and stress distribution of thermoelectric devices are analyzed. Firstly, the coupled mathematical model of heat transfer, power generation and stress of thermoelectric devices is established. The influence of the physical parameters of thermoelectric materials with temperature on the output characteristics and the effect of thermal radiation on the output characteristics are analyzed, and then the effect of non-uniform heat flux on the output characteristics is analyzed. The influence of different heat flux concentration is analyzed based on the same heat flux. Through selecting different cross sections of the module, we can see the temperature cloud map of the module under the non-uniform heat flux. The influence of non-uniform heat flux density on its efficiency is further analyzed. The starting and stopping characteristics of thermoelectric devices are studied. After studying the steady output characteristics, the unsteady output characteristics are studied, and the physical parameters are observed. The process of influence of thermal radiation on temperature and output voltage, at the same time, compared with the application of non-uniform heat flux density, Gao Si heat flux and non-uniform heat flux. Secondly, the thermal stress results of thermoelectric devices are studied. The maximum thermal stress node of the module can be obtained from the cloud diagram of the thermal stress simulation results. The results show that the maximum thermal stress node of the module is located at the right angle between the copper plate and the thermoelectric material, and the unsteady state analysis of the node is carried out. Through selecting a series of sections in the module, the forming process of thermal stress and the region most likely to occur thermal stress failure are obtained. The thermal strain cloud diagram and the displacement cloud diagram are observed. The thermal stress formation process is also obtained by the results of the unsteady analysis. Then the influence of the thickness of copper plate and the thickness of the thermal accumulation layer on the thermal stress is studied. And the effects on generation stability, stress stability, and phase relationship between heat flux, temperature and thermal stress.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TM913

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本文編號：1426850