An Annular Thermoacoustic Prime Mover

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An Annular Thermoacoustic Prime Mover

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Author : Hsiao-Tseng Lin
language : en
Publisher:
Release Date : 1997-09-01

An Annular Thermoacoustic Prime Mover written by Hsiao-Tseng Lin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997-09-01 with categories.

The dissertation constitutes the first detailed theoretical and experimental investigation of a thermoacoustic prime mover with periodic boundary conditions. There are five significant aspects to this research: (1) using DeltaE to analyze an annular prime mover, (2) developing an entirely new analysis program using MATLAB, (3) designing, building, and experimentally investigating a single stack, annular prime mover, (4) experimentally investigating a constricted, single stack annular prime mover, (5) predicting the performance of a two stack annular prime mover. The major conclusions are: (1) A single stack annular prime mover will not reach onset because the eigenmodes of the system do not support thermoacoustic growth. (2) A constricted annular prime mover will reach onset because the constriction forces dominating boundary conditions that alter the eigenmodes. (3) A two stack prime mover is predicted to reach onset because one of the eigenmodes of the symmetric system does support thermoacoustics.

Design Fabrication And Performance Test Of A Thermoacoustic Prime Mover

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Author :
language : en
Publisher:
Release Date : 2014

Design Fabrication And Performance Test Of A Thermoacoustic Prime Mover written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Heat categories.

Investigation Of A Constricted Annular Acoustic Resonator

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Author : Seok Yun Choe
language : en
Publisher:
Release Date : 1997-06-01

Investigation Of A Constricted Annular Acoustic Resonator written by Seok Yun Choe and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997-06-01 with categories.

One topic of current interest in thermoacoustic research is an annular prime mover Lin et al., J. Acoust. Soc. Am, 100, 2846 (1996). The staring point for this research is an investigation of a constricted annular resonator. A literature search of the field resulted in surprisingly few references. The results of analytic, numerical, and experimental investigations are presented. Introducing a constriction into an annular resonator splits each longitudinal duct mode into two modes, one of a higher frequency with a pressure antinode at the constriction and one at a lower frequency with a velocity antinode near the constriction. The lower mode is more sensitive to changes in the length and porosity of the constriction than the higher mode. Overall agreement between measured and predicted mode shapes and resonance frequencies is very good. It was found that it is necessary to include end corrections at the constriction to get accurate agreement between measured and predicted results.

Experimental Study On A Standing Wave Thermoacoustic Prime Mover With Air Working Gas At Various Pressures

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Author :
language : en
Publisher:
Release Date : 2016

Experimental Study On A Standing Wave Thermoacoustic Prime Mover With Air Working Gas At Various Pressures written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.

Investigation Of A Heat Driven Thermoacoustic Prime Mover

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Author : Hsiao-Tseng Lin
language : en
Publisher:
Release Date : 1989

Investigation Of A Heat Driven Thermoacoustic Prime Mover written by Hsiao-Tseng Lin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with categories.

The goal of this thesis is to investigate the work output of a heat driven thermoacoustic prime mover. The experimental approach was to measure the frequency response of both a simple resonant tube and a prime mover for a variety of values of mean gas pressure and applied temperature different across the prime mover stack. A least squares fit to the frequency response yields the quality factor which can be compared to predictions based on a short stack, boundary layer approximation theory. The results are reported of measurements made on the lowest three modes of the prime mover in helium for mean gas pressures between approximately 170 kPa and 500 kPa and the applied temperature differences between zero and onset. The signal waveforms of the sound generated by the prime mover above onset at a mean gas pressure of 308 kPa are also reported. Results for the resonant tube have at most 3% difference with theory. For the prime mover, the measurements generally agree with predictions for the fundamental mode except close to onset. This agreement between measured and predicted results worsens with decreasing mean gas pressure. Agreement is poor for the second and third modes for all pressures used. Finally, the sound generated by the prime mover above onset is highly distorted, and the distortion becomes more serve as the temperature difference increases. The peak positive pressure amplitude of this signal at temperature difference of 325 C, 368 C and 453 C are 1.1%, 4.4% and 7.9% of mean gas pressure, respectively. Keywords: Acoustics, Thermoacoustics, Thermoacoustic heat transports. (JHD).

Investigation Of An Argon Filled Thermoacoustic Prime Mover

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Author : John Dietrick Lamade
language : en
Publisher:
Release Date : 1991

Investigation Of An Argon Filled Thermoacoustic Prime Mover written by John Dietrick Lamade and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with categories.

Investigation Of A Heat Driven Thermoacoustic Prime Mover Above Onset Of Self Oscillation

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Author :
language : en
Publisher:
Release Date : 1991

Investigation Of A Heat Driven Thermoacoustic Prime Mover Above Onset Of Self Oscillation written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with categories.

The goal of this thesis is to investigate the work output of a heat driven thermoacoustic prime mover above onset of self-oscillation. The exponentially growing sound wave, generated when a prime mover is initially 'turned on, ' was digitally sampled for a helium filled prime mover at pressures ranging from 238 kPa to 500 kPa and at temperature differences ranging from onset to 400 K. This data was then digitally filtered by a 100 Hz band pass filter centered on the prime mover's fundamental frequency. A least mean squares fit was applied to the envelope of the filter's output in order to determine the temporal absorption coefficient beta. From beta, the quality factor was computed. These quality factors were then compared to thermoacoustic theory. The agreement between the theoretical predictions and the measured results is extremely good at high mean gas pressures. As the mean gas pressure decreases, however, the agreement between the theoretical value of onset and the predicted slope of the data, increasingly deviate.

Design Of A Toroidal Thermoacoustic Prime Mover

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Author : Szu-Wei Yang
language : en
Publisher:
Release Date : 1995

Design Of A Toroidal Thermoacoustic Prime Mover written by Szu-Wei Yang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with categories.

The topic of this thesis is the design of a toroidal prime mover. The primary design tool is a MATLAB program based on a standing wave analysis of thermoacoustics. A conventional prime mover that has been well studied, was used for validating the program. DeltaE, a program developed at Los Alamos National Laboratory for designing thermoacoustic engines, was also used as an auxiliary tool for validation test purposes. The validation suggested that the MATLAB program models the onset conditions of a conventional prime mover with fair accuracy. The program was then applied to a toroidal prime mover. A series of analyses were conducted on a toroidal prime mover to determine the influence of prime mover circumference, stack length, and duct radius. The final design calls for a 150 cm circumference, 2.54 cm duct radius, and 1.9 cm stack length. The contributions of this thesis are: (1) to develop and validate the MATLAB simulation program; (2) to provide a draft design for a toroidal prime mover for future research.

Design Of A Toroidal Thermoacoustic Prime Mover

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Author : Szu-Wei Yang
language : en
Publisher:
Release Date : 1995

Design Of A Toroidal Thermoacoustic Prime Mover written by Szu-Wei Yang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with categories.

The topic of this thesis is the design of a toroidal prime mover. The primary design tool is a MATLAB program based on a standing wave analysis of thermoacoustics. A conventional prime mover that has been well studied, was used for validating the program. DeltaE, a program developed at Los Alamos National Laboratory for designing thermoacoustic engines, was also used as an auxiliary tool for validation test purposes. The validation suggested that the MATLAB program models the onset conditions of a conventional prime mover with fair accuracy. The program was then applied to a toroidal prime mover. A series of analyses were conducted on a toroidal prime mover to determine the influence of prime mover circumference, stack length, and duct radius. The final design calls for a 150 cm circumference, 2.54 cm duct radius, and 1.9 cm stack length. The contributions of this thesis are: (1) to develop and validate the MATLAB simulation program; (2) to provide a draft design for a toroidal prime mover for future research.

Investigation Of An Argon Filled Thermoacoustic Prime Mover

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Author :
language : en
Publisher:
Release Date : 1991

Investigation Of An Argon Filled Thermoacoustic Prime Mover written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with categories.

The goal of this thesis is to investigate the behavior of a thermoacoustic prime mover filled with argon. Data was collected for three different operating conditions: (1) prior to the onset of acoustic oscillation, (2) immediately after onset and (3) after the prime mover had reached steady state, at mean gas pressures of approximately 80 kPa, 205 kPa and 305 kPa. Measured values of 1/Q are compared to predictions of a theory based on Swift's work. After onset, Q is determined from measurement of the rise time of the oscillations. The data set collected is the first to span onset and results show good agreement with theory. It is concluded that the theory can be used to provide reasonable input for a model to predict the steady state waveforms.