Publications
Adaptive quarter wavelength tube tuned by varying air temperature
Kieran Doherty, Francesco Larizza, Matthew Tripodi, Carl Q. Howard (2014)
Proceedings of Internoise 2014, Melbourne, Victoria, Australia, 16-19 November, paper 124Abstract:
An Adaptive Quarter-Wavelength Tube (AQWT) that can be tuned by varying the air temperature was simulated with both a 90 degree notched and bell-mouth t-piece using Computational Fluid Dynamics (CFD) and Finite Element Analysis (FEA). The QWT was tested experimentally to determine the noise reduction that could be achieved at the fundamental firing frequency of an internal combustion engine (ICE). Electrical air heaters injected hot air into the QWT that varied the speed of sound of air and therefore varied the tuned length of the tube. Results showed that the fundamental firing frequency could be attenuated by approximately 5 dB over a 65-75 Hz range by varying the air temperature within the QWT.
This material is now only available to staff and students of the University of
Adelaide.
Should you wish to receive a copy, please contact the
AVC Group webmaster.
Note that if this article is under review, then it cannot be released and email requests will not be answered.
Published Document - NOT available for public access
Manuscript - available for public access
