Flow visualization in a hybrid thermoacoustic system
An experimental investigation is conducted to understand the flow behavior near a stack in a hybrid thermoacoustic system including resonator and looped-tube. Time-resolved particle image velocimetry measurement is applied to obtain the evolution of the local oscillating flow. Phase-averaged results...
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sg-ntu-dr.10356-1608212022-08-03T05:06:54Z Flow visualization in a hybrid thermoacoustic system Shen, Lu Harikumar, Govind Wang, Kai Duan, Fei School of Mechanical and Aerospace Engineering Energy Research Institute @ NTU (ERI@N) Engineering::Mechanical engineering Thermoacoustic System Proper Orthogonal Decomposition An experimental investigation is conducted to understand the flow behavior near a stack in a hybrid thermoacoustic system including resonator and looped-tube. Time-resolved particle image velocimetry measurement is applied to obtain the evolution of the local oscillating flow. Phase-averaged results show two types of vortices in the flow field due to the stack: the primary vortices attaching at the end of stack, and the corresponding secondary vortices propagating with the base flow. Proper orthogonal decomposition is applied to illustrate small-scale fluctuations from the main flow structure. The temporal coefficients show that vortical flow structures vary from one cycle to another, consistent to the great increment of the phase-averaged turbulence kinetic energy during the period with vortical flow structures. With the same input power, the momentum fluctuation is larger at harmonic frequencies. At the same frequency, the turbulence level is nonmonotonic to the input power although the momentum fluctuation increases with the input power. Ministry of Education (MOE) The authors thank Ministry of Education of Singapore , Tier 1 RG188/17. 2022-08-03T05:06:53Z 2022-08-03T05:06:53Z 2021 Journal Article Shen, L., Harikumar, G., Wang, K. & Duan, F. (2021). Flow visualization in a hybrid thermoacoustic system. Experimental Thermal and Fluid Science, 125, 110374-. https://dx.doi.org/10.1016/j.expthermflusci.2021.110374 0894-1777 https://hdl.handle.net/10356/160821 10.1016/j.expthermflusci.2021.110374 2-s2.0-85101336919 125 110374 en RG188/17 Experimental Thermal and Fluid Science © 2021 Elsevier Inc. All rights reserved. |
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Engineering::Mechanical engineering Thermoacoustic System Proper Orthogonal Decomposition Shen, Lu Harikumar, Govind Wang, Kai Duan, Fei Flow visualization in a hybrid thermoacoustic system |
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An experimental investigation is conducted to understand the flow behavior near a stack in a hybrid thermoacoustic system including resonator and looped-tube. Time-resolved particle image velocimetry measurement is applied to obtain the evolution of the local oscillating flow. Phase-averaged results show two types of vortices in the flow field due to the stack: the primary vortices attaching at the end of stack, and the corresponding secondary vortices propagating with the base flow. Proper orthogonal decomposition is applied to illustrate small-scale fluctuations from the main flow structure. The temporal coefficients show that vortical flow structures vary from one cycle to another, consistent to the great increment of the phase-averaged turbulence kinetic energy during the period with vortical flow structures. With the same input power, the momentum fluctuation is larger at harmonic frequencies. At the same frequency, the turbulence level is nonmonotonic to the input power although the momentum fluctuation increases with the input power. |
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School of Mechanical and Aerospace Engineering |
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School of Mechanical and Aerospace Engineering Shen, Lu Harikumar, Govind Wang, Kai Duan, Fei |
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Article |
author |
Shen, Lu Harikumar, Govind Wang, Kai Duan, Fei |
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Shen, Lu |
title |
Flow visualization in a hybrid thermoacoustic system |
title_short |
Flow visualization in a hybrid thermoacoustic system |
title_full |
Flow visualization in a hybrid thermoacoustic system |
title_fullStr |
Flow visualization in a hybrid thermoacoustic system |
title_full_unstemmed |
Flow visualization in a hybrid thermoacoustic system |
title_sort |
flow visualization in a hybrid thermoacoustic system |
publishDate |
2022 |
url |
https://hdl.handle.net/10356/160821 |
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1743119570392055808 |