Using a side-branched volume to tune the acoustic field in a looped-tube travelling-wave thermoacoustic engine with a RC load
Using a side-branched volume to tune the acoustic field in a looped-tube travelling-wave thermoacoustic engine with a RC load
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DOI：
10.1016/j.enconman.2017.03.019
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发表时间：
2017-10
影响因子：
10.4
通讯作者：
A. Al-Kayiem;Zhibin Yu
中科院分区：
文献类型：
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作者：
A. Al-Kayiem;Zhibin Yu
行波热声发动机利用一个紧凑的声学网络，以获得正确的时间相位之间的声速和压力振荡的回热器内，迫使气体包裹，以经历斯特林的热力学循环。这样，热能可以转换成机械功（即，高强度压力波）。因此，控制热声发动机的时间相位对提高热声发动机的性能至关重要。已经提出并证明了用于调整时间定相的各种方式，包括被动和主动方法。本研究的目的是介绍一种新的被动相位调谐方法（即，侧支声学体积）来调谐环管行波热声发动机内的时间定相。在这项研究中，所提出的概念进行了研究数值和实验。利用DeltaEC软件（Design Environment for Low-amplitude ThermoAcoustic Energy Conversion）对实验台进行了仿真和设计。然后根据所获得的理论模型构建。实验结果与数值模拟结果吻合较好，表明该方法可以有效地调节环管热声发动机内声速和压力振荡之间的相位角，提高其性能。
Travelling-wave thermoacoustic engine utilises a compact acoustic network to obtain a right time-phasing between the acoustic velocity and pressure oscillations within the regenerator to force gas parcels to experience a Stirling-like thermodynamic cycle. As such, thermal energy can be converted to mechanical work (i.e., high-intensity pressure waves). It is therefore crucial to control the time-phasing carefully to improve the performance of thermoacoustic engines. Various ways have been proposed and demonstrated for adjusting time-phasing, including both passive and active methods. The aim of this study is to introduce a new passive phase tuning method (i.e., a side-branched acoustic volume) to tune the time-phasing within a looped-tube travelling wave thermoacoustic engine. The proposed concept has been investigated both numerically and experimentally in this research. An experimental rig was simulated and designed using DeltaEC software (Design Environment for Low-amplitude ThermoAcoustic Energy Conversion). It was then constructed according to the obtained theoretical model. The result of this study showed a qualitative agreement between experimental measurement and numerical simulations, demonstrating that the proposed technique can effectively adjust the phase angle between the acoustic velocity and pressure oscillations within the loop-tube thermoacoustic engines, and improve its performance.