by Naval Postgraduate School, Available from the National Technical Information Service in Monterey, Calif, Springfield, Va .
Written in English
|Contributions||Atchley, Anthony Armstrong, 1957-|
|The Physical Object|
|Pagination||56 p. ;|
|Number of Pages||56|
Investigation of a heat driven thermoacoustic prime mover above onset of self-oscillation. By Earl Clayton Bowers. Download PDF (3 MB) Abstract. Approved for public release; distribution is unlimitedThe goal of this thesis is to investigate the work output of a heat riven thermoacoustic prime mover above onset of self-oscillation. Author: Earl Clayton Bowers. Investigation of a Heat Driven Thermoacoustic Prime Mover above Onset of Self-Oscillation by Earl Clayton Bowers Lieutenant, United States Navy B.S., United States Naval Academy, Submitted in partial fulfillment of the requirements for the degrees of MASTER OF SCIENCE IN APPLIED SCIENCE, and MASTER OF SCIENCE IN ENGINEERING ACOUSTICS from theCited by: 2. The onset temperature difference of a thermoacoustic Stirling prime mover deeply depends on the length and porosity of the regenerator, the working gas, the frequency and the pressure, this. The model in the present work simulates the free oscillation in the thermoacoustic engine driven by the heat above onset temperature. The working fluid is the helium of 2 MPa.
The thermoacoustic heat engines was proposed as a solution to the heat transfer problem in microcircuits, pumping heat or producing spot cooling of specific circuit elements, i.e., a thermoacoustic prime mover converts heat to acoustic energy, or a thermoacoustic cooler or heat pump uses sound to pump heat upon a temperature gradient, as shown. The frequency response of a thermoacoustic prime mover has been measured as a function of the mean gas pressure and temperature gradient across the prime mover stack. The quality factor Q and resonance frequency can be determined from the response. As the temperature gradient is increased, the Q increases, indicating a decrease in attenuation across the stack. The heat energy of heater converts to acoustic power accompany with the heater temperature decreases and the cooler temperature increases when the prime mover onset. It can be seen from Fig. 7 that the temperature rise of 90° tilted angle is more obvious than that of 0° tilted angle when the prime mover onset. This is due to the onset. Fig. 1 shows the physical model and simulation domain for the thermoacoustic prime mover with half wavelength, which is composed of the prime mover and a resonant tube. The part of prime mover includes a parallel-plate stack, a hot-end heat exchanger and a cold-end heat exchanger. In this system, the stacks contain many identical parallel plates and it is ratio of the gap width and tube.
Book Search tips Selecting this option will search all publications across the Scitation platform Selecting this option will search all publications for the Publisher/Society in context. “ A thermoacoustic Stirling heat engine,” Nature “ Analysis of a thermoacoustic prime mover above onset of self-oscillation,” J. Acoust. Soc. Am. Earl C. Bowers, "Investigation of a heat driven thermoacoustic prime mover above the onset of self-oscillation," Master's Thesis, Naval Postgraduate School, September H. T. Lin, "Investigation of a Heat Driven Thermoacoustic Prime Mover," Master's Thesis, Naval Postgraduate School, December Arnott computed the onset temperature and the resonance frequency for a standing wave thermoacoustic prime mover and demonstrated that the self-oscillation took place when the acoustic power produced in the stack was greater than the viscous and thermal losses in the system. All of the above researchers assumed that the onset point coincided. Standing wave analysis of a thermoacoustic prime mover belo w onset of self- oscillation. Journal of the Acoustical Society of America, 92(5)–,