This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Investigation of Nozzle Clearance Effects on a Radial Turbine: Aerodynamic Performance and Forced Response
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 08, 2013 by SAE International in United States
Annotation ability available
Variable nozzle turbine (VNT) technology has become a popular technology for diesel engine application. To pivot the nozzle vane and adjust the turbine operating condition, nozzle clearances are inevitable on both the hub and shroud side of turbine housing. Leakage flow formed inside the nozzle clearance leads to extra flow loss and makes the nozzle exit flow less uniform, thus further affects downstream aerodynamic performance of the rotor. As the leakage mixing with nozzle wake flow, the process is highly unsteady, which increases the fluctuation amplitude of transient load on the rotating turbine wheels.
In present paper, firstly steady CFD analysis of a turbocharger turbine was performed at different nozzle openings. Then unsteady simulation of the turbine was carried out to investigate the interaction between the leakage flow through nozzle clearance and the main flow. Nozzle clearance's effect on turbine performance was investigated. It was found that the leakage flow not only leads to pressure loss in nozzle vane passages, but also creates mixing loss as nozzle leakage flow merging with main flow in turbine wheels. With nozzle clearance, flow unsteadiness inside turbine wheels has been increased. A finite element model of the turbine wheel was built and turbine forced response to the transient loading was simulated with harmonic analysis. Due to the increased flow unsteadiness, nozzle clearance also leads to significant increase of turbine vibration stresses.
- Liangjun Hu - ESI Mindware Inc
- Ben Zhao - Beijing Institute of Technology
- Ce Yang - Beijing Institute of Technology
- Xin Shi - Beijing Institute of Technology
- Shangtao Liu - Beijing Institute of Technology
- Harold Sun - Ford Motor Co
- Jianwen Yi - Ford Motor Co
- Eric W. Curtis - Ford Motor Co
- Anthony Morelli - Ford Motor Co
- Jizhong Zhang - National Key Lab of Turbocharger
CitationHu, L., Sun, H., Yi, J., Curtis, E. et al., "Investigation of Nozzle Clearance Effects on a Radial Turbine: Aerodynamic Performance and Forced Response," SAE Technical Paper 2013-01-0918, 2013, https://doi.org/10.4271/2013-01-0918.
- Watson , N. , and Janota , M. S. Turbocharging the Internal Combustion Engine Wiley Interscience New York 1982
- Baines , N. C. Radial and Mixed flow turbines options for high boost turbocharger 7th Int. Conference on Turbocharger and Turbocharging 2002
- Rogo , C. , Hajek , T. , and Roelke , R. Aerodynamic Effects of Moveable Sidewall Nozzle Geometry and Rotor Exit Restriction on the Perfomance of a Radial Turbine SAE Technical Paper 831517 1983 10.4271/831517
- Arnold , S. Schwitzer Variable Geometry Turbo and microprocessor Control Design and Evaluation SAE Technical Paper 870296 1987 10.4271/870296
- Franklin , P. Performance Development of the Holset Variable Geometry Turbocharger SAE Technical Paper 890646 1989 10.4271/890646
- Kawaguchi , J. , Adachi , K. , Kono , S. , and Kawakami , T. Development of VFT (Variable Flow Turbocharger) SAE Technical Paper 1999-01-1242 1999 10.4271/1999-01-1242
- Spence , S. W. ; Neill , J. W. ; Cunningham , G. An investigation of the flow field through a variable geometry turbine stator with vane endwall clearance Proceedings of the Institution of Mechanical Engineers Part A: Journal of Power and Energy 2006 220 899 910
- Tamaki , H. ; Goto , S. ; Unno , M. The effect of clearance flow of variable nozzle on radial turbine performance ASME paper, GT2008-50461
- Matsunmoto , K. ; Jinnai , Y. et al. Development of variable geometry turbocharger for diesel passenger car, C554/005/98 ImechE 329 346
- Okazaki , Y. ; Matsudaira , N. et al. A case of variable geometry turbocharger development. C111/86 IMechE 191 195
- Hua Chen Turbine Wheel design for Garrett advanced variable geometry turbines for commercial vehicle applications 8 th international conference on turbochargers and turbocharging Institution of Mechanical Engineers 2006 London UK
- Tomoki Kawakubo Unsteady rotor-stator interaction of a radial-inflow turbine with variable nozzle vanes ASME paper, GT2010-23677
- Kulkarni A. Turbinewheel high cycle fatigue reliability prediction 9 th international conference on turbochargers and turbocharging Institution of Mechanical Engineers 2010 London UK
- Tom Heuer , Marc Gugau , and Achim Klein An analytical approach to support high cycle fatigue validation for turbocharger turbine stages ASME paper, GT2008-50764
- Daxin Zhu 1992 Turbocharging and turbochargers Beijing China Machine Press