### Abstract

Mixed flow turbines represent a potential solution to the increasing requirement for high pressure, low velocity ratio operation in turbocharger applications. While literature exists for the use of these turbines at such operating conditions, there is a lack of detailed design guidance for defining the basic geometry of the turbine, in particular, the cone angle – the angle at which the inlet of the mixed flow turbine is inclined to the axis. This investigates the effect and interaction of such mixed flow turbine design parameters.

Computational Fluids Dynamics was initially used to investigate the performance of a modern radial turbine to create a baseline for subsequent mixed flow designs. Existing experimental data was used to validate this model.

Using the CFD model, a number of mixed flow turbine designs were investigated. These included studies varying the cone angle and the associated inlet blade angle.

The results of this analysis provide insight into the performance of a mixed flow turbine with respect to cone and inlet blade angle.

Computational Fluids Dynamics was initially used to investigate the performance of a modern radial turbine to create a baseline for subsequent mixed flow designs. Existing experimental data was used to validate this model.

Using the CFD model, a number of mixed flow turbine designs were investigated. These included studies varying the cone angle and the associated inlet blade angle.

The results of this analysis provide insight into the performance of a mixed flow turbine with respect to cone and inlet blade angle.

Original language | English |
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Title of host publication | Proceedings of The 6th International Conference on Pumps and Fans with Compressors and Wind Turbines |

Subtitle of host publication | IOP Conference Series: Materials Science and Engineering |

Publisher | Institute of Physics |

Pages | 649-657 |

Number of pages | 9 |

Volume | 52 |

ISBN (Electronic) | 978-1-63439-863-3 |

Publication status | Published - Sep 2013 |

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## Cite this

Leonard, T., Spence, S., & Filsinger, D. (2013). A numerical study of automotive turbocharger mixed flow turbine inlet geometry for off design performance. In

*Proceedings of The 6th International Conference on Pumps and Fans with Compressors and Wind Turbines: IOP Conference Series: Materials Science and Engineering*(Vol. 52, pp. 649-657). Institute of Physics.