不同結(jié)構(gòu)回?zé)崞黝l率及輸出特性研究
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本文選題：熱聲網(wǎng)絡(luò) + 回?zé)崞?/strong>�。� 參考：《中南大學(xué)》2014年碩士論文
【摘要】：回?zé)崞魇菬崧曓D(zhuǎn)換的核心部件,其結(jié)構(gòu)影響著熱聲系統(tǒng)的起振溫度、壓力波動、運(yùn)行頻率等工作特性。目前,現(xiàn)有的回?zé)崞鞯慕Y(jié)構(gòu)較為單一,且鮮有針對回?zé)崞鬏敵鎏匦缘难芯�。本文在國家自然科學(xué)基金項目(51276201)和前人工作的基礎(chǔ)上,提出了兩種新型回?zé)崞鞑⒀芯苛祟l率特性及輸出特性。 本文依據(jù)流體阻抗法,推導(dǎo)熱聲系統(tǒng)頻率方程,計算出系統(tǒng)的前七階頻率值。利用DeltaEC軟件設(shè)計了1/4波長駐波型熱聲發(fā)動機(jī),計算出模型的壓力分布及體積流率分布。 實(shí)驗(yàn)研究了不同熱端加熱功率下,采用蜂窩陶瓷回?zé)崞鞯臒崧暉釞C(jī)系統(tǒng)的起振溫度、工作頻率、壓力振幅等基本工作特性。結(jié)果表明：1.系統(tǒng)起振溫度隨加熱功率增加而降低。2.加熱功率為98W、115W時整個起振過程中,熱端溫度上升較穩(wěn)定；加熱功率133W時,熱端溫度出現(xiàn)了劇烈的波動,且加熱功率越大,熱聲系統(tǒng)壓力振幅越高,相應(yīng)消振時間越長。3.實(shí)驗(yàn)結(jié)果與計算頻率相符,研究得出系統(tǒng)運(yùn)行頻率與加熱功率無關(guān)。 采用翅片式回?zé)崞髋c蜂窩陶瓷回?zé)崞鞯臒崧曁匦韵啾容^,當(dāng)熱端加熱功率133W時,翅片式回?zé)崞髌鹫駵囟嚷缘�；壓力振幅遠(yuǎn)小于蜂窩陶瓷回?zé)崞鞣�(wěn)定工作時的壓力振幅,消振時壓力波動瞬間下降；兩者運(yùn)行頻率也不相同。 本文創(chuàng)新設(shè)計了卷筒絲網(wǎng)回?zé)崞?實(shí)驗(yàn)數(shù)據(jù)表明,系統(tǒng)起振溫度較高；起振過程穩(wěn)定；系統(tǒng)運(yùn)行頻率與蜂窩陶瓷回?zé)崞鬟\(yùn)行頻率相同。 最后,采用壓電陶瓷發(fā)電片研究了熱聲熱機(jī)采用蜂窩陶瓷回?zé)崞�、翅片式回�(zé)崞鲿r的系統(tǒng)輸出特性,測得輸出電壓波動以壓電片的振蕩頻率。
[Abstract]:Regenerator is the core component of thermoacoustic conversion. Its structure affects the working characteristics of thermoacoustic system, such as temperature, pressure fluctuation, operating frequency and so on. At present, the current structure of the regenerator is relatively simple, and there are few studies on the output characteristics of the regenerator. Based on the project of National Natural Science Foundation 51276201) and previous works, two new regenerators are proposed and the frequency and output characteristics are studied. Based on the fluid impedance method, the frequency equation of thermoacoustic system is derived, and the first seven order frequency values of the system are calculated. A 1 / 4 wavelength standing wave thermoacoustic engine was designed by using DeltaEC software. The pressure distribution and volume flow rate distribution of the model were calculated. The starting temperature, working frequency and pressure amplitude of the thermoacoustic thermo-mechanical system with honeycomb ceramic regenerator under different hot end heating power are studied experimentally. The result shows that 1: 1. The starting temperature of the system decreases with the increase of heating power. When the heating power is 98 W / 115W, the temperature of the hot end increases steadily, and the temperature of the hot end fluctuates sharply when the heating power is 133W, and the higher the heating power is, the higher the pressure amplitude of the thermoacoustic system is and the longer the damping time is. 3. The experimental results are consistent with the calculated frequency, and it is found that the operating frequency of the system is independent of the heating power. Compared with honeycomb ceramic recuperator, when heating power at hot end is 133W, the starting temperature of fin regenerator is slightly lower, and the pressure amplitude is much smaller than that of honeycomb ceramic regenerator when it is working stably. The fluctuation of pressure decreases in an instant, and the frequency of operation is not the same. In this paper, the reel screen regenerator is innovatively designed. The experimental data show that the system has a higher starting temperature, a stable starting process and the same operating frequency as the honeycomb ceramic regenerator. Finally, the output characteristics of the thermoacoustic thermoelectric machine with honeycomb ceramic regenerator and wing plate regenerator are studied by using piezoelectric ceramic generator. The oscillation frequency of the piezoelectric plate is measured as the fluctuation of the output voltage.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TB657
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