Numerical study of aero- acoustic characteristics in an automotive air-intake system

Jahani, K ; Sharif University of Technology | 2013

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  1. Type of Document: Article
  2. Publisher: OAL-Osterreichischer Arbeitsring fur Larmbekampfung , 2013
  3. Abstract:
  4. Compartment noise has gained significant importance to meet customer expectation. One of the dominant sources of noise from whole engine as a system is the one which is induced from fresh air intake. Geometrical features in air induction systems (AIS) airflow path are often responsible for unusual noise due to the complex air flow structure and its interaction with the internal acoustic field. To reduce air intake noise basically resonator and expansion chamber are used on automotive vehicles. Resonators are widely used for noise reduction of air induction systems. Although, airflow bench tests are faster to evaluate various alternate design geometries, understanding the mechanism of such noise generation and silencing devices is necessary for developing an effective design. In this study, a 3D computational fluid dynamics (CFD) simulation was performed on baseline geometry (fresh air intake along with resonator), in order to predict the distinct acoustic characteristic. The associated results are extracted and the acoustic behavior of the air intake is studied in order to identify the probable problematic area. Further investigation has been conducted on a modified geometry, with the aim of minimizing the noise produced by air charge drawn into the AIS according to the base case. The computational analysis should be able to predict the flow field with high accuracy so that the pressure fluctuations, which are actually the source of longitudinal waves (sound), can be first monitored and later analyzed to obtain the required results. These pressure fluctuations are caused by the turbulent behavior of the fluid
  5. Keywords:
  6. Air- intake system ; Computational aero- Acoustic ; Detached eddy simulation ; Acoustic fields ; Acoustic variables control ; Aeroacoustics ; Air intakes ; Computational fluid dynamics ; Geometry ; Noise abatement ; Resonators ; Acoustic characteristic ; Air induction systems ; Computational analysis ; Computational fluid dynamics simulations ; Customer expectation ; Detached eddy simulations ; Geometrical features ; Pressure fluctuation ; Acoustic noise
  7. Source: 42nd International Congress and Exposition on Noise Control Engineering 2013, INTER-NOISE 2013: Noise Control for Quality of Life ; Volume 7 , 2013 , Pages 5990-5999 ; 9781632662675 (ISBN)
  8. URL: http://www.acoustics.asn.au/conference_proceedings/ICSVS-1997/pdf/scan/sv970332.pdf