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  • Acoustical Society of America (ASA)  (6)
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  • Acoustical Society of America (ASA)  (6)
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  • 1
    Online Resource
    Online Resource
    Thermoacoustic oscillation around a plate in a nonlinear standing wave field
    Acoustical Society of America (ASA) ; 2000
    In:  The Journal of the Acoustical Society of America Vol. 108, No. 5_Supplement ( 2000-11-01), p. 2555-2555
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 108, No. 5_Supplement ( 2000-11-01), p. 2555-2555
    Abstract: A stack of plates is a most basic and important component of thermoacoustic engines and thermoacoustic refrigerators. Analysis of thermoacoustic oscillation around a plate is a basis of analysis of the mechanism of these machines, but only the works in a linear standing wave field were published. On the other hand, it is shown from some experiments that the thermoacoustic efficiencies of these machines will be increased in the nonlinear standing wave field, but any quantitative result has not been found yet. In this paper a numerical simulation of thermoacoustic oscillation around a plate in a standing wave tube where the sound-pressure level of the sources is from 90 to 170 dB has been presented in order to discuss the nonlinear effects quantitatively. Two conclusions have been obtained: (1) thermoacoustic efficiencies are increased with the increase of the source slowly below 150 dB, moderately from 150 to 160 dB, and rapidly above 160 dB. (2) There exists a rule of multiplying growth of high-order harmonics of oscillation temperature level, which is very similar to the rule of multiplying growth of high-order harmonics of oscillation sound-pressure level in a nonlinear standing wave tube.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4743487
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2000
    detail.hit.zdb_id: 1461063-2
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  • 2
    Online Resource
    Online Resource
    Numerical prediction of vortex shedding noise radiated by a centrifugal impeller
    Acoustical Society of America (ASA) ; 2006
    In:  The Journal of the Acoustical Society of America Vol. 119, No. 5_Supplement ( 2006-05-01), p. 3412-3412
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 119, No. 5_Supplement ( 2006-05-01), p. 3412-3412
    Abstract: Numerical prediction of fan noise is very difficult work because of the restriction of the computer technology. The fluctuating blade force caused by the vortex shedding from a centrifugal impeller is a main noise source but no paper has been published so far to predict this kind of noise. Vortex flow models to predict low-pressure axial flow fans were developed by several researchers since 1964. In this paper a study of numerical prediction of vortex shedding noise radiated by a commercial centrifugal impeller is reported, which is based on a vortex flow model developed by Lee in 1993. Three main research works are carried out by the authors. First, using FLUENT software a numerical simulation of 3D turbulent flow field of the impeller in order to predict the aerodynamic performance is completed and well validated by the experiment. Then, the velocity profile near the wall at the trailing edge of the blade is analyzed in detail to determine the boundary layer thickness both on the pressure and suction sides. Finally, the total SPL of the noise is predicted and the results agree with the experimental data within 3 dB near the design operation.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4786800
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2006
    detail.hit.zdb_id: 1461063-2
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  • 3
    Online Resource
    Online Resource
    Numerical simulation with experimental validation for nonlinear standing wave phenomena
    Acoustical Society of America (ASA) ; 1998
    In:  The Journal of the Acoustical Society of America Vol. 103, No. 5_Supplement ( 1998-05-01), p. 3014-3015
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 103, No. 5_Supplement ( 1998-05-01), p. 3014-3015
    Abstract: The study of nonlinear standing waves is of great significance to nonlinear acoustics. The strong nonlinear standing wave phenomena are constantly encountered in the experimental studies of acoustics, such as multiplying growth of higher harmonics, saturation of harmonics, bifurcation, and chaos. The experimental study of strong nonlinear standing waves is highly restricted by the sound source, which is very difficult to build up when its sound power becomes very strong. Therefore, in this paper, a numerical approach to the problem was adopted. By the use of Euler equations and MacCormack fourth-order difference method, the multiplying growth and saturation of higher harmonics in a nonlinear standing wave have been numerically simulated. By increasing the sound-pressure level of the excited source from 125 to 190 dB, the entire development process of the nonlinear standing wave was clearly illustrated. Some new interesting results were obtained from the simulation. For example, the sound-pressure level at zero frequency enlarges quickly with increasing the intensity of the excited source. A detailed comparison between numerical simulation and the relevant experimental results shows that the numerical investigation is successful. [Work supported by NSFC.]  
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.422493
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1998
    detail.hit.zdb_id: 1461063-2
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  • 4
    Online Resource
    Online Resource
    Prediction of cutoff noise in centrifugal fans
    Acoustical Society of America (ASA) ; 1999
    In:  The Journal of the Acoustical Society of America Vol. 106, No. 4_Supplement ( 1999-10-01), p. 2172-2172
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 106, No. 4_Supplement ( 1999-10-01), p. 2172-2172
    Abstract: The most important noise in centrifugal fans is aerodynamic noise, in which cutoff noise is the most main component. Cutoff noise is mainly caused by the fluctuating pressure on the cutoff in the volute impacted by the nonuniform flow from the exit of the rotating impeller. A numerical method is presented for prediction of cutoff noise in centrifugal fans. The contents of the method are mainly the following. (1) The fluctuating pressure serving as the source of cutoff noise is given out by using the existing computation software of 3D viscous flow in centrifugal fans and the time-frozen hypothesis. (2) The sound field in the volute of a centrifugal fan and the sound power levels of cutoff noise are computed by using the forth-order MacCormack scheme and making some important numerical measures. The sound field in the volute and the sound power levels of cutoff noise for three practical volutes with different cutoff clearance have been computed and the acoustic pressure distribution in space and change with time are discussed. Finally, the sound power levels of cutoff noise have been measured. The errors between the predicted and the tested sound power levels of cutoff noise are less than 3 dB. [Work supported by NSF.]
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.428139
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1999
    detail.hit.zdb_id: 1461063-2
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  • 5
    Online Resource
    Online Resource
    Numerical prediction of aerodynamic noise radiated from a cross-flow fan
    Acoustical Society of America (ASA) ; 2006
    In:  The Journal of the Acoustical Society of America Vol. 119, No. 5_Supplement ( 2006-05-01), p. 3411-3411
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 119, No. 5_Supplement ( 2006-05-01), p. 3411-3411
    Abstract: The surface pressure fluctuations of blades, vortex wall, and the rear wall of a cross-flow fan are commonly considered as the aerodynamic noise sources of an air conditioning unit. In order to predict the noise, these pressure fluctuations were at first obtained by solving the 2D unsteady Reynolds-averaged Navier-Stokes (RANS) equations using a computational fluid dynamics software. It was validated by the fan performance experiments that the prediction of static pressure in the channel agreed well with the test data. It means the results of the pressure fluctuations obtained from the numerical simulation are correct. Then, the Ffowcs Williams-Hawkings (FW-H) equation was used to predict the far-field noise caused by these sources. The errors of the prediction of the sound-pressure levels of the blade passing frequency (BPF) and total noise are within 4 and 3 dB, respectively, comparing with the corresponding measured data. It is shown from the numerical prediction that only the surface pressure fluctuations of the rear wall and the vortex wall are main sources, and that the method of numerical prediction of aerodynamic noise radiated from a cross-flow fan is successful.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4786794
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2006
    detail.hit.zdb_id: 1461063-2
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  • 6
    Online Resource
    Online Resource
    Numerical study of sound field radiated from a circular duct with an open end
    Acoustical Society of America (ASA) ; 1998
    In:  The Journal of the Acoustical Society of America Vol. 103, No. 5_Supplement ( 1998-05-01), p. 2839-2839
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 103, No. 5_Supplement ( 1998-05-01), p. 2839-2839
    Abstract: A dispersion-relation-preserving (DRP) scheme for computational acoustics has been developed in recent years. This scheme is of high accuracy and can preserve the original dispersion relations of governing equations so that a good global acoustic solution can be ensured. However, the scheme is usually not only very complex but also problem dependent. In this paper, a unified DRP scheme for both internal and boundary points is developed for solving the sound field radiated from a circular duct with an open end. This unified DRP scheme is further applied to obtain the sound fields numerically in three different cases, namely, without flow and flange, without flow but with flange, and with flow and flange. In addition, relevant reflection efficiencies are also predicted at various Helmholtz numbers. Satisfactory comparisons of the predicted reflection efficiencies with data from other studies are illustrated. It is also shown that the numerical method with the DRP scheme presented in the paper is successful.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.421483
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 1998
    detail.hit.zdb_id: 1461063-2
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