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The Impact of Volute Aspect Ratio on the Performance of a Mixed Flow Turbine

Lee, Samuel, Barrans, Simon, Jupp, Martyn and Nickson, Ambrose (2017) The Impact of Volute Aspect Ratio on the Performance of a Mixed Flow Turbine. Aerospace, 4 (4). p. 56. ISSN 2226-4310

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Current trends in the automotive industry towards engine downsizing mean turbocharging now plays a vital role in engine performance. A turbocharger increases charge air density using a turbine to extract waste energy from the exhaust gas to drive a compressor. Most turbocharger applications employ a radial inflow turbine. However, mixed flow turbines can offer non-zero blade angles, reducing leading edge (LE) separation at low velocity ratios. The current paper investigates the performance of a mixed flow turbine with three different volute aspect ratio (AR) designs (AR = 0.5, 1 and 2). With constant A/r (ratio of volute area to centroid radius), the AR = 0.5 volute design produced a 4.3% increase in cycle averaged mass flow parameter (MFP) compared to the AR = 2 design. For the purpose of performance comparison, it was necessary to manipulate the volute A/r’s to ensure constant MFP for aerodynamic similarity. With the volute A/r’s manipulated to ensure constant MFP for aerodynamic similarity, the maximum variation of cycle averaged normalized efficiency measured between the designs was 1.47%. Purely in the rotor region, the variation in normalized cycle averaged efficiency was 1%. The smallest tested volute aspect ratio showed a significant increase in volute loss while the ARs of 1 and 2 showed similar levels of loss. The smallest AR volute showed significant secondary flow development in the volute. The resulting variation in LE incidence was found to vary as a result

Item Type: Article
Subjects: T Technology > T Technology (General)
Schools: School of Computing and Engineering
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Depositing User: Sharon Beastall
Date Deposited: 14 Dec 2017 14:22
Last Modified: 28 Aug 2021 15:22


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