Inlet recirculation in automotive turbocharger centrifugal compressors

P. X. L. Harley, S. W. T. Spence, J. Early, D. Filsinger, M. Dietrich

Research output: Chapter in Book/Report/Conference proceedingConference contribution

18 Citations (Scopus)


As the designers of modern automotive turbochargers strive to increase map width and lower the mass flow rate at which compressor surge occurs, the recirculating flows at the impeller inlet are becoming a much more relevant aerodynamic feature. Compressors with relatively large map widths tend to have very large recirculating regions at the inlet when operating close to surge; these regions greatly affect the expected performance of the compressor.

This study analyses the inlet recirculation region numerically using several modern automotive turbocharger centrifugal compressors. Using 3D Computational Fluid Dynamics (CFD) and a single passage model, the point at which the recirculating flow begins to develop and the rate at which it grows are investigated. All numerical modelling has been validated using measurements taken from hot gas stand tests for all compressor stages. The paper improves upon an existing correlation between the rate of development of the recirculating region and the compressor stage, which is supported by results from the numerical analysis.
Original languageEnglish
Title of host publicationProceedings of the 11th International Conference on Turbochargers and Turbocharging
PublisherWoodhead Publishing
Number of pages12
ISBN (Print)978-0-08-100033-5
Publication statusPublished - 23 Sept 2014
Event11th International Conference on Turbochargers and Turbocharging - London, United Kingdom
Duration: 13 May 201414 May 2014


Conference11th International Conference on Turbochargers and Turbocharging
Country/TerritoryUnited Kingdom


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