A 1-D Vaneless Diffuser Model Accounting for the Effects of Spanwise Flow Stratification

Charles Stuart, Stephen Spence, Sung In Kim, Dietmar Filsinger, Andre Starke

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Abstract

The radial vaneless diffuser, though comparatively simple in terms of geometry, poses a significant challenge in obtaining an accurate 1-D based performance prediction due to the swirling, unsteady and distorted nature of the flow field. Turbocharger compressors specifically, with the ever increasing focus on achieving a wide operating range, have been recognised to operate with significant regions of spanwise separated flow, particularly at off design conditions.
Using a combination of single passage Computational Fluid Dynamics (CFD) simulations and extensive gas stand test data for three geometries, the current study aims to evaluate the onset and impact of spanwise flow stratification in radial vaneless diffusers, and how the extent of the aerodynamic blockage presented to the flow throughout the diffuser varies with both geometry and operating condition. Having analysed the governing performance parameters and flow phenomena, a novel 1-D modelling method is presented and compared to an existing baseline method as well as test data to quantify the improvement in prediction accuracy achieved.
Original languageEnglish
Title of host publicationProceedings of The International Gas Turbine Congress 2015 Tokyo
PublisherGas Turbine Society of Japan
Pages485-494
Number of pages10
ISBN (Print)978-4-89111-008-6
Publication statusPublished - 15 Nov 2015
Event11th International Gas Turbine Congress - Tokyo, Japan
Duration: 15 Nov 201520 Nov 2015

Conference

Conference11th International Gas Turbine Congress
CountryJapan
CityTokyo
Period15/11/201520/11/2015

Bibliographical note

Published in Proceedings
ISBN 978-4-89111-008-6

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  • Cite this

    Stuart, C., Spence, S., Kim, S. I., Filsinger, D., & Starke, A. (2015). A 1-D Vaneless Diffuser Model Accounting for the Effects of Spanwise Flow Stratification. In Proceedings of The International Gas Turbine Congress 2015 Tokyo (pp. 485-494). Gas Turbine Society of Japan. http://www.gtsj.org/english/igtc/IGTC2015/