Application of laser-based instrumentation for measurement of time-resolved temperature and velocity fields in the thermoacoustic system
Application of laser-based instrumentation for measurement of time-resolved temperature and velocity fields in the thermoacoustic system
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DOI：
10.1016/j.ijthermalsci.2010.03.015
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发表时间：
2010-09
影响因子：
4.5
通讯作者：
Lei Shi;Zhibin Yu;A. Jaworski
中科院分区：
文献类型：
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作者：
Lei Shi;Zhibin Yu;A. Jaworski
这项工作旨在开发可靠的基于激光的测量技术，以实现热声系统中的基本传热和流体流动研究。面临的挑战是更好地理解在声场施加的振荡流动条件下关键部件之间的能量传递模式，例如电堆（或回热器）和冷热热交换器（位于电堆/回热器结构的两侧）。这项工作中采用的测量方法包括分别使用平面激光诱导荧光（PLIF）和粒子图像测速（PIV）进行二维温度和速度场测量。在四分之一波长驻波声谐振器中并排放置的一对模拟热交换器的翅片周围进行了研究，以模拟热声系统的工作条件。翅片分别通过电阻加热和水冷却保持恒温。获得了声循环20个阶段的速度场和温度场分布。讨论了惯性、粘性和热效应对随时间变化的局部温度和速度分布的影响。还显示了两个领域之间的相互影响。概述了在振荡条件下获得有用的传热相关性的未来工作。
This work aims to develop reliable laser-based measurement techniques to enable fundamental heat transfer and fluid flow studies in thermoacoustic systems. The challenge is to better understand the modes of energy transfer between the key components, such as stacks (or regenerators) and the hot and cold heat exchangers (located on two sides of the stack/regenerator structure), under the oscillatory flow conditions imposed by the acoustic field. The measurement methodologies adopted in this work include combined two-dimensional temperature and velocity field measurements using Planar Laser-Induced Fluorescence (PLIF) and Particle Image Velocimetry (PIV), respectively. These are investigated around the fins of a pair of mock-up heat exchangers placed side by side in a quarter-wavelength standing-wave acoustic resonator, to mimic the working conditions of a thermoacoustic system. The fins are kept at constant temperatures by means of resistive heating and water cooling, respectively. The velocity and temperature field distributions for 20 phases in the acoustic cycle have been obtained. The impact of the inertial, viscous and thermal effects on the time-dependent local temperature and velocity distributions is discussed. Mutual interaction between both fields is also shown. Future work towards obtaining useful heat transfer correlations in oscillatory conditions is outlined.