Wave Motion Analysis of Acoustic standing wave induced in a Closed Pipe for Engineering Application in New Thermo-Fluid Technology.

封闭管道中引起的声驻波的波动分析在新型热流体技术中的工程应用。

• 批准号: 11450070
• 负责人: KAWAHASHI Masaaki
• 金额: $ 4.74万
• 依托单位: SAITAMA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-11450070/
• 关键词: Finite amplitude wave motion; Nonlinear wave motion; Acoustic streaming; Thermo-acoustic effect; Acoustic compressor; 管内定在波; 音響圧縮機

Acoustic standing wave induced in a tube is one of well-known and fundamental physical phenomena. Physical properties, such as pressure and velocity distributions, mode of oscillation, and so on, observed in acoustic standing waves are well evaluated by linear acoustic theory. On the other hand, finite amplitude standing waves induced in a tube accompanying nonlinear phenomena still have unsolved problems. In recent engineering applications of finite amplitude standing waves for new technology in fluid or thermofluid engineerings such as thermacoustic refrigerator and acoustic compressor, realization of large amplitude shockless-standing wave is required to avoid acoustic saturation, which causes the suppression of thermoacoustic effect or increasing ratio of pressure amplitude. It has been reported the finite amplitude shockless standing wave can be realized in a tube with cross-sectional area change along the axis. The acoustic compressor composed by a gas-filled closed tube and a dr … More iving piston will be design with this concept. However, the fundamental characteristics of the finite amplitude standing wave in a gas-filled closed tube driven by a piston with area change has not been analyzed in detail. In this research, the physical properties of the finite amplitude wave motion induced in different shaped tubes have been evaluated by using linear acoustic theory, numerical simulation and experiments. The numerical results on resonant frequency and oscillation modes induced in an exponentially area change tube agree well with the predictions based on linear theory. The limit of area contraction ratio to realize the shockless standing wave and the effect of area contraction to obtain high compression ratio for different shaped tubes are clarified by the numerical calculation. The results in the limited condition are verified by the experiments.As another application, coupling effect of acoustic standing wave to thermal convection has been investigated. The thermal convection generated in a horizontal closed duct, which has rectangular cross-section, at high Rayleigh number is unsteady or turbulent. When the acoustic standing wave is combined with the unsteady thermal convection, the thermal convection is constrained into steady roll type convection characterized with 1/4 wavelength of sound, In this research, the velocity and density field of the coupling convection have been measured by using PIV method and digital laser speckle photography. The results obtained show the acoustic standing wave is playing the role of control of unsteadiness in thermal convection.The above-mentioned results give us useful knowledge for applications of acoustic standing waves to new fluid or thermofluid technology. Less

声驻波是一种常见的基本物理现象。在声驻波中观察到的物理性质，如压力和速度分布，振荡模式等，可以很好地用线性声学理论进行评估。另一方面，有限振幅驻波在管道中引起的非线性现象仍然有未解决的问题。近年来，有限振幅驻波在热声制冷机、声压缩机等流体或热流体发动机新技术中的工程应用，要求实现大振幅的无激波驻波，以避免声饱和，从而抑制热声效应或增大压幅比。已有文献报道，在截面积沿轴向沿着变化的圆管中可以实现有限振幅无激波驻波。介绍了一种由充气封闭管和驱动器组成的声压缩机， ...更多信息 驱动活塞将设计成具有这种概念。然而，在充气封闭管道中，由变截面活塞驱动的有限振幅驻波的基本特性还没有得到详细的分析。本文采用线性声学理论、数值模拟和实验相结合的方法，对不同形状管道中有限振幅波动的物理特性进行了研究。数值计算结果表明，指数变截面管的谐振频率和振荡模式与线性理论的预测结果吻合较好。通过数值计算，阐明了不同形状圆管实现无激波驻波的面积收缩比的极限以及面积收缩对获得高压缩比的影响。实验验证了有限条件下的结果。作为另一个应用，研究了声驻波对热对流的耦合作用。高瑞利数时，矩形截面水平封闭管道内的热对流是非定常的或湍流的。将声驻波与非定常热对流相结合，将热对流约束为具有1/4声波波长特征的定常滚动型对流。本研究采用PIV方法和数字激光散斑照相技术测量了耦合对流的速度场和密度场。结果表明，声驻波在热对流中起着控制非定常性的作用，为声驻波在新的流体或热流体技术中的应用提供了有益的知识。少

项目成果

川橋正昭,Anwar Md Hossain,小塚浩ニ,平原裕行: "断面積が変化する軸対称閉管内の有限振幅定在波"日本機械学会論文集(B編),投稿中(受付番号No.01-0184).

Masaaki Kawahashi、Anwar Md Hossain、Hiroshi Kozuka、Hiroyuki Hirahara：“具有不同横截面积的轴对称封闭管道中的有限振幅驻波”日本机械工程师学会论文集（B 版），目前正在提交（接收号：No） 01-0184）。

Masaaki Kawahashi, Kenji Nishino and Hiroyuki Hirahara: "PIV Measurements of Thermal Convection Currents Transformed by Finite Amplitude Acoustic Standing Wave"Proceedings of 3rd International Workshop out PIV. (1999)

Masaaki Kawahashi、Kenji Nishino 和 Hiroyuki Hirahara：“有限振幅声驻波变换的热对流的 PIV 测量”PIV 第三届国际研讨会论文集。

小塚浩二、川原正昭、平原裕行: "断面積が変化する管内のショックレス有限振幅定在波の解析"日本機械学会講演論文集. 99-19. 195-196 (1999)

Koji Kozuka、Masaaki Kawahara、Hiroyuki Hirahara：“具有不同横截面积的管道中无冲击有限振幅驻波的分析”日本机械工程师学会会议记录 99-196 (1999)。

Masaaki Kawahashi,Kenji Nishino and Hiroyuki Hirahara: "PIV Measurements of Thermal Convection Currents Transformed by Finite Amplitude Acoustic Standing Wave"Proceedings of 3rd International Workshop on PIV. 439-443 (1999)

Masaaki Kawahashi、Kenji Nishino 和 Hiroyuki Hirahara：“有限振幅声驻波变换的热对流的 PIV 测量”第三届 PIV 国际研讨会论文集。

Anwar Md Hossain, Masaaki Kawahashi and Hiroyuki Hirahara: "Finite amplitude standing wave in a closed duct with varying cross section"Proceedings of ASME-FEDSM '01. (FEDSM 2001-18196). 1-6 (2001)

Anwar Md Hossain、Masaaki Kawahashi 和 Hiroyuki Hirahara：“具有不同横截面的封闭管道中的有限振幅驻波”ASME-FEDSM 01 论文集。