热声振荡流中的振动诱导流和流动

Azman Hafiidz Aji, Fatimah Al Zahrah Mohd Saat, Fadhilah Shikh Anuar, Patcharin Saechan
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引用次数: 0

摘要

热声系统中的诱导声流是由声波振动引起的,会导致系统中的平均流量发生变化。这种现象会产生净流体流动的趋势,从而导致系统内部某些区域的能量变化。然而,人们尚未完全了解整个系统的振动对流动流的影响,但这对更有效的运行非常重要。本研究在流动频率为 23.6 Hz 的驻波热声试验台中对振动导致的流动流进行了实验研究。实验值显示并说明了理论公式中未计算在内的振动导致的流动流的存在。结果表明,驱动比(DR)振幅与流动振荡速度之间存在相关性。在对理论和实际证据进行研究后,我们可以清楚地看到,由于谐振器壁的振动,在烟囱的进气口和出气口区域测量到的主气流以外的方向存在着边际流速。这种边际流速会随着气流驱动比的增大而增大,这可能是测量到的气流振幅与理论值之间存在差异的潜在原因。
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Vibration-Induced Flow and Streaming in Oscillatory Flow of Thermoacoustics
Induced acoustic streaming flow in thermoacoustic systems occurs due to acoustic vibrations, causing changes to the mean flow in the systems. This phenomenon creates a tendency to generate net fluid flow that can cause energy change within certain areas inside the system. However, the effects of the entire system’s vibrations on the flow streaming are not yet fully understood, yet it is important for a more effective operation. This study experimentally investigated the flow streaming resulting from vibration in a standing-wave thermoacoustic test rig with a flow frequency of 23.6 Hz. The existence of flow streaming due to vibration which was not counted in the theoretical formula is shown and indicated by experimental values. The result shows that there is a correlation between the amplitude of the drive ratio (DR) and the velocity of the oscillation of the flow. Upon examining both the theoretical and the practical evidence, it becomes clear that there exists a marginal flow velocity in directions other than the main flow due to the vibration of resonator’s wall as measured at the intake and outflow areas of the stack. This marginal flow velocity amplifies as the drive ratio of flow increases and it may potentially explain the observed difference between measured flow amplitude and the theoretical value.
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来源期刊
Journal of Advanced Research in Fluid Mechanics and Thermal Sciences
Journal of Advanced Research in Fluid Mechanics and Thermal Sciences Chemical Engineering-Fluid Flow and Transfer Processes
CiteScore
2.40
自引率
0.00%
发文量
176
期刊介绍: This journal welcomes high-quality original contributions on experimental, computational, and physical aspects of fluid mechanics and thermal sciences relevant to engineering or the environment, multiphase and microscale flows, microscale electronic and mechanical systems; medical and biological systems; and thermal and flow control in both the internal and external environment.
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