Experimental verification of a two-sensor acoustic intensity measurement in lossy ducts.

Two-sensor method proposed by Fusco et al. ["Two-sensor power measurements in lossy ducts," J. Acoust. Soc. Am. 91, 2229-2235 (1992)] is a novel technique that determines acoustic intensity of a gas column in a wide duct from measurements of pressure based on the boundary layer approximation. For further development of this method, its validity is experimentally tested through comparison with the direct method measuring the pressure and the velocity simultaneously, and its formulation is modified to include the narrow duct range where the duct radius is smaller than the viscous boundary layer thickness of the gas. It is shown that the modified two-sensor method enables quick and accurate evaluation of the acoustic intensity seamlessly from narrow to wide duct ranges.

[1]  Scott Backhaus,et al.  Acoustic recovery of lost power in pulse tube refrigerators , 1999 .

[2]  W. P. Arnott,et al.  Thermoacoustic engines , 1991, IEEE 1991 Ultrasonics Symposium,.

[3]  L. Wilen,et al.  Traveling-wave amplification in a variable standing wave ratio device , 2002 .

[4]  Akira Tominaga,et al.  Thermodynamic aspects of thermoacoustic theory , 1995 .

[5]  H. Tijdeman.  On the propagation of sound waves in cylindrical tubes , 1974 .

[6]  Yuki Ueda,et al.  Experimental studies of a thermoacoustic Stirling prime mover and its application to a cooler , 2004 .

[7]  W. T. Chu.  Extension of the two‐microphone transfer function method for impedance tube measurements , 1986 .

[8]  Tetsushi Biwa,et al.  A pistonless Stirling cooler , 2002 .

[9]  G. Swift,et al.  A cascade thermoacoustic engine. , 2003, The Journal of the Acoustical Society of America.

[10]  Taichi Yazaki,et al.  Measurements of sound propagation in narrow tubes , 2007, Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences.

[11]  D. A. Blaser,et al.  Transfer function method of measuring in-duct acoustic properties. I - Theory. II - Experiment , 1980 .

[12]  Tetsushi Biwa,et al.  Work flow measurements in a thermoacoustic engine , 2001 .

[13]  F. Saybert,et al.  Experimental determination of acoustic properties using a two-microphone random-excitation technique * , 2004 .

[14]  T. Yazaki,et al.  TRAVELING WAVE THERMOACOUSTIC ENGINE IN A LOOPED TUBE , 1998 .

[15]  Mats Åbom,et al.  Influence of errors on the two‐microphone method for measuring acoustic properties in ducts , 1986 .

[16]  H. Nomura,et al.  Acoustic intensity measurement in a narrow duct by a two-sensor method. , 2007, The Review of scientific instruments.

[17]  Taichi Yazaki,et al.  Measurement of sound generation in thermoacoustic oscillations , 1998, Proceedings of the Royal Society of London. Series A: Mathematical, Physical and Engineering Sciences.

[18]  H. Nomura,et al.  Measurement of the Q value of an acoustic resonator. , 2005, Physical review. E, Statistical, nonlinear, and soft matter physics.

[19]  T. Biwa,et al.  Acoustic field in a thermoacoustic Stirling engine having a looped tube and resonator , 2002 .

[20]  Michel Bruneau,et al.  Acoustic power flow measurement in a thermoacoustic resonator by means of laser Doppler anemometry (L.D.A.) and microphonic measurement , 2000 .

[21]  G. Swift,et al.  Two-sensor power measurements in lossy ducts. , 1992, The Journal of the Acoustical Society of America.

[22]  Tetsushi Biwa,et al.  Experimental demonstration of thermoacoustic energy conversion in a resonator. , 2004, Physical review. E, Statistical, nonlinear, and soft matter physics.