Investigation of flow-acoustic interaction in automotive turbocharger
2014 (English)In: Proceedings of ISMA 2014 - International Conference on Noise and Vibration Engineering and USD 2014 - International Conference on Uncertainty in Structural Dynamics, KU Leuven , 2014, 1327-1331 p.Conference paper (Refereed)
In IC engine design, the surge condition of a turbocharger is a well-recognized phenomena. As the resulting global fluctuation of mass flux in the intake system is hazardous, the implemented safety margins are large. In order to, reduce such safety margins and employ turbochargers more efficiently, it is of interest to investigate acoustic fields as a possible surge triggering mechanism. Regardless the increasing relevance of this topic today, only few publications exist addressing the acoustics of turbochargers from the perspective of surge prediction and triggering. In the present paper acoustical properties of an automotive turbocharger are experimentally studied at the limit of stable operation as well as under normal operating conditions in the unique CCGEx test rig at KTH. The full two-port data including passive and active parts is determined and utilized to investigate the possible coupling effects between unstable flow and acoustic fields. The local flow instabilities, occurring at the limit of globally stable operation, can interact with the acoustic field and amplify incident sound waves which eventually can lead to an unstable situation and surge. This effect can be studied from the passive two-port data. In addition the active data can be used to find the occurrence of compact correlated sources in the compressor such as rotating stall a pre-cursor of surge.
Place, publisher, year, edition, pages
KU Leuven , 2014. 1327-1331 p.
Internal combustion engines, Machine design, Safety engineering, Structural dynamics, Superchargers, Turbomachinery, Acoustical properties, Automotive turbochargers, Correlated sources, Flow-acoustic interaction, Incident sound waves, Normal operating conditions, Stable operation, Triggering mechanism
IdentifiersURN: urn:nbn:se:kth:diva-157948ISI: 000352201001045ScopusID: 2-s2.0-84913568850ISBN: 978-907380291-9OAI: oai:DiVA.org:kth-157948DiVA: diva2:773688
26th International Conference on Noise and Vibration Engineering, ISMA 2014, Including the 5th International Conference on Uncertainty in Structural Dynamics, USD 2014, 15 September 2014 through 17 September 2014,Leuven, Belgium
QC 201505122014-12-192014-12-182015-05-12Bibliographically approved