This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Investigation of the Applicability of Numerical Noise Prediction of an Axial Vehicle Cooling Fan
Technical Paper
2014-01-0002
ISSN: 0148-7191, e-ISSN: 2688-3627
Annotation ability available
Sector:
Language:
English
Abstract
This paper focuses on the applicability of numerical prediction of sound radiation caused by an axial vehicle cooling fan. To investigate the applicability of numerical methods, a hybrid approach is chosen where first a CFD simulation is performed and the sound radiation is calculated in a second step. For the acoustic simulation an integral method described by Ffowcs-Williams-Hawkings is used to predict the sound propagation in the far-field. The simulation results are validated with experiments. The corresponding setup in experiments and simulation represents an overall system which includes the cooler, the cooling fan and a combustion engine dummy. To optimize the economical applicability in terms of simulation setup and run time, different approaches are investigated. This includes the simulation of only one blade using a periodic boundary condition as compared to the whole fan geometry. In the CFD simulation an SAS-turbulence-model is applied. The results show that this is a very useful approach considering the challenges in prediction of numerical sound. On the one hand, the turbulence model has to solve small scales which cause sound in high frequency ranges which leads to a small time increment and a high grid resolution. On the other hand, a long simulation time for predicting sound in low frequency ranges is needed. Additional to the sound propagation in the far-field, it is a benefit to be able to localize the acoustic sources with regards to geometrical optimization. For this, the divergence of the Lighthill Tensor is calculated on the CFD grid.
Recommended Content
| Technical Paper | Rotor Stator Interactions in Engine Cooling Fan Systems |
| Technical Paper | Continued Study of the Error and Consistency of Fan CFD MRF Models |
Topic
Citation
Becher, M. and Becker, S., "Investigation of the Applicability of Numerical Noise Prediction of an Axial Vehicle Cooling Fan," SAE Technical Paper 2014-01-0002, 2014, https://doi.org/10.4271/2014-01-0002.Also In
References
- Pérot , F. Direct Aeroacoustics Prediction of a Low Speed Axial Fan 16 th AIAA/CEAS Aeroacoustics Conference, AIAA-2010-3887 2010
- Moreau , S. , Henner , M. , Casalino , D. , Gullbrand et al. Toward the prediction of low-speed fan noise Center for Turbulence Research, Proceedings of the Summer Program 2006 2006
- Zayani , M. Caglar S. , GabiI M. Aeroacoustical investigations on axial fans for automotive cooling systems FAN 2012 2012
- Menter , F. Two-Equation Eddy-Viscosity Turbulence Models for Engineering Applications AIAA Journal Vol. 32 8 pp. 1598 1605 1994
- Scheit , C. Implementation of a Ffowcs Williams and Hawkings (FW-H) method for aeroacoustic prediction Master of Science thesis University of Erlangen-Nuremberg 2007
- Scheit , C. , Karic , B. and Becker , S. Effect of blade wrap angle on efficiency and noise of small radial fan impellers - A computational and experimental study Journal of Sound and Vibration No. 331 5 pp. 996 1010 2011 doi: 10.1016/j.jsv.2011.10.014
- Heinemann , T. Implementation of a Ffowcs Williams and Hawkings (FW-H) formulation for moving surfaces Diploma thesis University of Erlangen-Nuremberg 2011
- Ehrenfried , K. Strömungsakustik (Aeroacoustics) Mensch & Buch Verlag pp. 145 159 2004
- Lighthill , J. M. On Sound Generated Aerodynamically I. General Theory Proceedings of the Royal Society Vol. 211 No. 1107 pp. 564 587 1952
- Lighthill , J. M. On Sound Generated Aerodynamically II. Turbulence as a Source of Sound Proceedings of the Royal Society pp. 1 32 1954