Accession Number : ADA319250

Title :   Fundamental Studies of Radial Wave Thermoacoustic Engines.

Descriptive Note : Final rept. 1 Oct 93-14 Sep 96,

Corporate Author : NEVADA UNIV SYSTEM RENO ATMOSPHERIC SCIENCES CENTER

Personal Author(s) : Arnott, W. P.

PDF Url : ADA319250

Report Date : SEP 1996

Pagination or Media Count : 19

Abstract : Our goal was to evaluate the influence of resonator geometry on thermoacoustic engine performance. Resonator geometry affects thermoacoustic heat transport and acoustic power generation, energy dissipation, and stack volume. Thermoacoustic engines placed in the first radial mode of a cylindrical resonator were studied in detail, and were compared with the more-developed plane wave resonator counterparts. A radial wave prime mover was constructed from use of our numerical model. Experimental results are that nonlinear generation of harmonics is considerably suppressed by the anharmonic radial wave resonator in comparison with a similar plane wave prime mover, and that the observed onset temperature for oscillation was in substantial agreement with model results. Short-stack-approximation results for radial and plane wave acoustic refrigerators indicate the plane wave geometry produces slightly better overall refrigerators when maximizing the coefficient of performance and cooling capacity together, though one radial geometry produces greater cooling capacity when coefficient of performance is not of central importance. The numerical model was used to evaluate a plane wave heat-driven sound source on a radial wave acoustic refrigerator. The optimized hybrid had an overall efficiency of 20%, and the refrigerator coefficient of performance was 25% Carnot.

Descriptors :   *HEAT TRANSFER, *ACOUSTICS, MATHEMATICAL MODELS, VOLUME, OPTIMIZATION, MODELS, CAPACITY(QUANTITY), PERFORMANCE(ENGINEERING), THERMODYNAMICS, ENERGY, HARMONICS, DISSIPATION, COOLING, NONLINEAR SYSTEMS, CYLINDRICAL BODIES, COEFFICIENTS, ACOUSTIC ARRAYS, ENGINES, GEOMETRY, ELECTRIC POWER PRODUCTION, HYBRID SYSTEMS, RESONATORS, OSCILLATION, PLANE WAVES, STACKING, WAVES, REFRIGERATION SYSTEMS, PLANE GEOMETRY.

Subject Categories : Acoustics
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE