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Designing Automotive Rear Air Handling System for Low Flow Induced Noise using Broadband Noise Source and Ffowcs-Williams & Hawkings Models
Technical Paper
2009-01-0537
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
To increase the comfort level of a vehicle cabin, vehicles today are equipped with rear cooling unit in addition to the primary heating ventilation and air conditioning (HVAC) system that supplies conditioned air into the cabin through the instrument panel (IP) duct and console or foot duct. Ducting for the rear unit is generally provided through C or D pillar and the roof of the vehicle. Owing to packaging and styling constraints, flow induced noise in roof duct has become a key parameter in design and development of the rear cooling unit.
This paper, broadly discusses:
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Two Broadband Noise Source (BNS) Models namely (i) Proudman’s model for quadrupole source and (ii) Curle’s boundary layer model for dipole source and
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Ffowcs-Williams & Hawkings (FW-H) model for noise level information at receiver location.
BNS model available in commercial Computational Fluid Dynamics (CFD) code Fluent™ has been used as a design tool for identifying the critical zones of high noise level for further redesigning of the ducts for acceptable noise level. The performance of the complete rear air handling system (AHS) at cabin level along with the noise level at different receiver locations is then predicted by using FW-H model.
The comparative study of CFD analysis and real time experimental results confirm that rear AHS can be designed for low noise level using CFD approach with BNS model as a design tool and performance can be checked by FW-H model at receiver location, thereby reducing system development cost and time drastically.
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Citation
Patidar, A., "Designing Automotive Rear Air Handling System for Low Flow Induced Noise using Broadband Noise Source and Ffowcs-Williams & Hawkings Models," SAE Technical Paper 2009-01-0537, 2009, https://doi.org/10.4271/2009-01-0537.Also In
References
- Humbad, N. Automotive HVAC Flow Noise Prediction Models presented at SAE World Congress, 2001-01-1498 2001
- Ayar, A. Ambs, R. Capellmann, C. Schillemeit, B. Matthes, M. Prediction of Flow-Induced Noise in Automotive HVAC Systems Using a Combined CFD/CA Approach presented at SAE World Congress, 2005-01-0509 2005
- Khondge, A.D Sovani, S.D. Kim, S. Guzy, S.C. Farag, A.A. On Predicting Aeroacoustic Performance of Ducts with Broadband Noise Source Models presented at SAE World Congress, 2005-01-2495 2005
- Mohamud, O.M. Johnson, P. Broadband Noise Source Models as Aeroacoustic Tools in Designing Low NVH HVAC Ducts presented at SAE World Congress, 2006-01-1192 2006
- Sandboge, R. Caro S. Ploumhans, P. Ambs, R. Schillemeit, B. Washburn, K.B. Shakib, F. Validation of a CAA formulation based on Lighthill’s Analogy using AcuSolve and Actran/LA on an Idealized Automotive HVAC Blower and on an axial fan presented at AIAA, 2006–2992 2006
- Caro, S. Ploumhans, P. Gallez, X. Implementation of Lighthill’s Acoustic Analogy in a Finite/Infinite Elements Framework presented at AIAA, 2004–2891 2004
- Lighthill, M.J. On the Sound Generated Aerodynamically: Part I – General Theory Proc. Roy. Soc. A211 1952 564 587
- Fluent Inc. Users Guide, Fluent 6.3 2006
- Proudman, I. The Generation of Noise by Isotropic Turbulence Pro. Roy. Soc. A214 1952 119
- Curle, N. The Influence of Solid Boundaries upon Aerodynamic Sound Proc. Roy. Soc. A231 1955 505 514
- Lilley, G.M. The Radiated Noise From Isotropic Turbulence Revisited NASA Langley Research Center Hampton, VA 24681 1993
- Sarkar, S. Hussaini, M.Y. Computation of the Sound Generated by Isotropic Turbulence NASA Langley Research Center Hampton VA 24681 1993
- Williams, J.E. Hawkings, D.L. Sound Generation by Turbulence and Surfaces in Arbitrary Motion Proc. Roy. Soc. A264 1969 321 342