A 1-D radial vaneless diffuser model accounting for the effects of aerodynamic blockage

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

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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 aerodynamic blockage in radial vaneless diffusers, and how the extent of the blocked region 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
Number of pages12
Publication statusPublished - 24 Sep 2015
EventInternational Turbocharging Seminar 2015 - Tianjin, China
Duration: 23 Sep 201524 Sep 2015


ConferenceInternational Turbocharging Seminar 2015


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