Non-linear phenomena occurring during the start-up process of a travelling-wave looped-tube thermoacoustic engine

Abdulrahman S. Abduljalil, Zhibin Yu, Artur J. Jaworski

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6 Citations (Scopus)

Abstract

This article reports the investigation of non-linear start-up processes in a looped-tube thermoacoustic engine. The engine utilises air as working gas, and has the fundamental frequency of around 111 Hz. It is observed that the mean pressure and the input heat power are the two key parameters controlling the start-up behaviour of the engine. When these are varied, a range of non-linear transient phenomena are observed, which include the 'on-off' effect, 'fishbonelike' oscillations (i.e. the quasi-periodic pressure amplitude bursts followed by a quasi steady state), and the normal smooth start-up process. The experiments show that the 'fishbone-like' bursts are a new mode of pressure amplitude growth. A series of experiments have been conducted to investigate in detail the influence of mean pressure, input heat power and regenerator type on the occurrence of such quasi-periodic amplitude bursts. It is observed that the duration of the pressure amplitude bursts depends on the combination of the heating power and the mean pressure. The observations suggest that there are strong interactions between the acoustic and temperature fields within the regenerator. It is thought that these can lead to the reported quasi-periodic unsteady behaviour of the engine.

Original languageEnglish
Pages (from-to)822-836
Number of pages15
JournalProceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy
Volume226
Issue number7
DOIs
Publication statusPublished - 1 Nov 2012
Externally publishedYes

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Thermoacoustic engines
Traveling wave tubes
Regenerators
Air engines
Engines
Acoustic fields
Temperature distribution
Experiments
Heating
Gases

Cite this

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title = "Non-linear phenomena occurring during the start-up process of a travelling-wave looped-tube thermoacoustic engine",
abstract = "This article reports the investigation of non-linear start-up processes in a looped-tube thermoacoustic engine. The engine utilises air as working gas, and has the fundamental frequency of around 111 Hz. It is observed that the mean pressure and the input heat power are the two key parameters controlling the start-up behaviour of the engine. When these are varied, a range of non-linear transient phenomena are observed, which include the 'on-off' effect, 'fishbonelike' oscillations (i.e. the quasi-periodic pressure amplitude bursts followed by a quasi steady state), and the normal smooth start-up process. The experiments show that the 'fishbone-like' bursts are a new mode of pressure amplitude growth. A series of experiments have been conducted to investigate in detail the influence of mean pressure, input heat power and regenerator type on the occurrence of such quasi-periodic amplitude bursts. It is observed that the duration of the pressure amplitude bursts depends on the combination of the heating power and the mean pressure. The observations suggest that there are strong interactions between the acoustic and temperature fields within the regenerator. It is thought that these can lead to the reported quasi-periodic unsteady behaviour of the engine.",
keywords = "Non-linear processes, Thermoacoustic engine start-up, Thermoacoustics, Travelling wave",
author = "Abduljalil, {Abdulrahman S.} and Zhibin Yu and Jaworski, {Artur J.}",
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T1 - Non-linear phenomena occurring during the start-up process of a travelling-wave looped-tube thermoacoustic engine

AU - Abduljalil, Abdulrahman S.

AU - Yu, Zhibin

AU - Jaworski, Artur J.

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N2 - This article reports the investigation of non-linear start-up processes in a looped-tube thermoacoustic engine. The engine utilises air as working gas, and has the fundamental frequency of around 111 Hz. It is observed that the mean pressure and the input heat power are the two key parameters controlling the start-up behaviour of the engine. When these are varied, a range of non-linear transient phenomena are observed, which include the 'on-off' effect, 'fishbonelike' oscillations (i.e. the quasi-periodic pressure amplitude bursts followed by a quasi steady state), and the normal smooth start-up process. The experiments show that the 'fishbone-like' bursts are a new mode of pressure amplitude growth. A series of experiments have been conducted to investigate in detail the influence of mean pressure, input heat power and regenerator type on the occurrence of such quasi-periodic amplitude bursts. It is observed that the duration of the pressure amplitude bursts depends on the combination of the heating power and the mean pressure. The observations suggest that there are strong interactions between the acoustic and temperature fields within the regenerator. It is thought that these can lead to the reported quasi-periodic unsteady behaviour of the engine.

AB - This article reports the investigation of non-linear start-up processes in a looped-tube thermoacoustic engine. The engine utilises air as working gas, and has the fundamental frequency of around 111 Hz. It is observed that the mean pressure and the input heat power are the two key parameters controlling the start-up behaviour of the engine. When these are varied, a range of non-linear transient phenomena are observed, which include the 'on-off' effect, 'fishbonelike' oscillations (i.e. the quasi-periodic pressure amplitude bursts followed by a quasi steady state), and the normal smooth start-up process. The experiments show that the 'fishbone-like' bursts are a new mode of pressure amplitude growth. A series of experiments have been conducted to investigate in detail the influence of mean pressure, input heat power and regenerator type on the occurrence of such quasi-periodic amplitude bursts. It is observed that the duration of the pressure amplitude bursts depends on the combination of the heating power and the mean pressure. The observations suggest that there are strong interactions between the acoustic and temperature fields within the regenerator. It is thought that these can lead to the reported quasi-periodic unsteady behaviour of the engine.

KW - Non-linear processes

KW - Thermoacoustic engine start-up

KW - Thermoacoustics

KW - Travelling wave

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