本文關(guān)鍵詞：低起振溫差的熱聲熱機(jī)特性研究　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： 起振條件 熱聲網(wǎng)絡(luò) 多級環(huán)形熱聲熱機(jī) 熱聲制冷機(jī)

【摘要】：熱聲技術(shù)是一種利用熱聲效應(yīng)實現(xiàn)熱能與聲能(一種機(jī)械能量)轉(zhuǎn)換的新技術(shù),在低品位能源尤其是新能源和低溫余熱的利用方面有很大的應(yīng)用前景。熱聲熱機(jī)起振溫度的高低直接關(guān)系到系統(tǒng)可利用能量的品位,因此,研究低溫差的熱聲熱機(jī)對于低品位能源的利用具有十分重要的意義。為了探索低起振溫度和高性能熱聲熱機(jī)系統(tǒng)的特性,本文開展了低溫差熱聲熱機(jī)系統(tǒng)的數(shù)值模擬研究,主要研究內(nèi)容如下:1)利用DeltaEC軟件,同時考慮系統(tǒng)效率與高溫?fù)Q熱器加熱溫度,設(shè)計了低溫差的駐波熱聲熱機(jī),并利用二端口網(wǎng)絡(luò)模型及起振判據(jù)模擬分析了駐波熱機(jī)的起振特性,研究了板疊和諧振管結(jié)構(gòu)參數(shù)對熱聲熱機(jī)穩(wěn)態(tài)和起振特性的影響。研究結(jié)果表明:在不同的充氣壓力下,存在最優(yōu)的板疊間距,使起振溫度最低,而最優(yōu)板疊間距與熱滲透率的比值基本不變,對于所研究的駐波熱聲熱機(jī),該比值大約為2.25。2)運用熱聲理論和傳輸矩陣方法推導(dǎo)了多級環(huán)形熱聲熱機(jī)的起振條件式,該起振條件式是系統(tǒng)的結(jié)構(gòu)配置、工況和工質(zhì)熱物性質(zhì)的隱式函數(shù),可以為熱聲熱機(jī)的設(shè)計優(yōu)化與性能分析提供一種工程實用的網(wǎng)絡(luò)方法。將該網(wǎng)絡(luò)方法用于多級環(huán)形熱聲熱機(jī)的研究,模擬分析了起振特性及其影響因素。研究表明:在不同充氣壓力下,均存在獲得最低起振溫差的最優(yōu)回?zé)崞鹘z網(wǎng)水力半徑;熱機(jī)的級數(shù)越多,起振溫差和振蕩頻率越低。同時,利用DeltaEC軟件對熱機(jī)的穩(wěn)態(tài)特性也進(jìn)行模擬分析,計算了熱聲熱機(jī)的輸出聲功和效率。研究結(jié)果表明:在相同的加熱功率下,采用混合工質(zhì)可以降低回?zé)崞鲀啥怂璧臏夭?并產(chǎn)生較大的聲功率。3)運用推導(dǎo)的起振條件式,對多級環(huán)形熱聲熱機(jī)驅(qū)動的制冷系統(tǒng)進(jìn)行了起振特性及影響因素的研究;同時,分析了穩(wěn)定工況下的系統(tǒng)特性,以及制冷溫度和熱機(jī)加熱溫度對系統(tǒng)性能的影響。研究結(jié)果顯示:小型熱聲熱機(jī)驅(qū)動的制冷系統(tǒng)有較低的起振溫差;相對于制冷溫度,制冷機(jī)單元的相對卡諾性能系數(shù)存在最大值,且熱機(jī)的加熱溫度越高,該最大值也越大,對應(yīng)的制冷溫度越低。
[Abstract]:Thermoacoustic technology is a new technology which uses thermoacoustic effect to realize the conversion of heat energy to sound energy (a kind of mechanical energy). It has great application prospect in low grade energy, especially in the utilization of new energy and low temperature waste heat. The starting temperature of thermoacoustic engine is directly related to the available energy grade of the system. It is very important to study the thermoacoustic engine with low temperature difference for the utilization of low grade energy. In order to explore the characteristics of low starting temperature and high performance thermoacoustic heat engine system. In this paper, the numerical simulation of low temperature differential thermoacoustic engine system is carried out. The main research contents are as follows: 1) using DeltaEC software, considering system efficiency and heating temperature of high temperature heat exchanger. The standing wave thermoacoustic engine with low temperature difference is designed, and the characteristics of the standing wave thermoacoustic engine are simulated and analyzed by using the two-port network model and the starting criterion. The influence of the structural parameters of laminated and resonant tubes on the steady state and vibration initiation characteristics of thermoacoustic thermoengine is studied. The results show that the optimal stack spacing exists under different inflatable pressures, so that the starting temperature is the lowest. However, the ratio of optimal plate spacing to thermal permeability is almost unchanged, for the standing wave thermoacoustic engine studied. Based on thermoacoustic theory and transfer matrix method, the starting condition of multistage ring thermoacoustic engine is derived, which is the configuration of the system structure. The implicit function of the working condition and the thermal properties of the working fluid can provide an engineering practical network method for the design optimization and performance analysis of the thermoacoustic engine. The network method is applied to the study of the multistage ring thermoacoustic engine. The characteristics of starting vibration and its influencing factors are simulated and analyzed. The results show that under different inflatable pressures, there is an optimal hydraulic radius of the regenerator wire mesh to obtain the lowest starting temperature difference. The more series of heat engine, the lower the temperature difference and frequency. At the same time, the steady state characteristic of heat engine is simulated and analyzed by DeltaEC software. The output acoustic work and efficiency of the thermoacoustic engine are calculated. The results show that under the same heating power, the temperature difference between the two ends of the regenerator can be reduced by using the mixed working fluid. The vibration initiation characteristics and influencing factors of the refrigeration system driven by multi-stage ring thermoacoustic engine are studied by using the derived starting conditions. At the same time, the characteristics of the system under steady working conditions and the effects of refrigeration temperature and heating temperature on the performance of the system are analyzed. The results show that the temperature difference of starting vibration of the refrigeration system driven by a small thermoacoustic engine is lower; Compared with the refrigeration temperature, the relative Carnot performance coefficient of the refrigerator unit has the maximum value, and the higher the heating temperature of the heat engine, the larger the maximum value, and the lower the corresponding refrigeration temperature.
【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】：TK05

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