A numerical method of predicting aeroacoustic performance of HVAC ducts is presented here. The method comprises of two steps. First, the steady state flow structure inside a duct is simulated using computational fluid dynamics (CFD). A k-epsilon based turbulence model is used. In the second step broadband noise source models are used to estimate the sound power generation within the duct. In particular, models estimating dipole and quadrupole sound source strengths are studied.A baseline generic duct geometry was studied with 3 additional design variations. The loudness rankings of these three designs were determined numerically. Simultaneously, the sound generated by these three designs was measured on a flow bench with a microphone kept downstream of the duct outlet. The numerically predicted loudness rankings were compared with experimentally determined rankings and the two are found to be in agreement, thus validating the numerical method.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    On Predicting Aeroacoustic Performance of Ducts with Broadband Noise Source Models


    Additional title:

    Sae Technical Papers


    Contributors:

    Conference:

    SAE 2005 Noise and Vibration Conference and Exhibition ; 2005



    Publication date :

    2005-05-16




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Broadband Noise Source Models as Aeroacoustic Tools in Designing Low NVH HVAC Ducts

    Mohamud, Omar M. / Johnson, Perry | SAE Technical Papers | 2006


    Broadband noise source models as aeroacoustic tools in designing low NVH HVAC ducts

    Mohamud,O.M. / Johnson,P. / Visteon,US | Automotive engineering | 2006




    Aeroacoustic Noise Source Mechanisms in Simple Expansion Chambers

    Rubio, Gustavo / De Roeck, Wim / Meyers, J. et al. | AIAA | 2006