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Study on the Interaction of Clearance Flow and Shock Wave in a Turbine Nozzle
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 28, 2017 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
Radial flow Variable Nozzle Turbine (VNT) enables better matching between the turbocharger and engine. At partial loading or low-end engine operating points, the nozzle vane opening of the VNT is decreased to achieve higher turbine efficiency and transient response, which is a benefit for engine fuel consumption and emission. However, under certain small nozzle opening conditions (such as nozzle brake and low-end operating points), strong shock waves and strong nozzle clearance flow are generated. Consequently, strong rotor-stator interaction between turbine nozzle and impeller is the key factor of the impeller high cycle fatigue and failure. In present paper, flow visualization experiment is carried out on a linear turbine nozzle. The turbine nozzle is designed to have single-sided clearance, and the Schlieren visualization method is used to describe the formation and development process of clearance flow and shock wave under different clearance and expansion ratio configurations. Numerical simulations are also performed to investigate the flow structure and the interaction behavior between shock wave and clearance flow in details. Results indicate that for the investigated turbine nozzle, the shock wave is squeezed and bent in the opposite direction of the main flow in the interaction region. In the location close to the end-wall, the shock wave is truncated by the clearance flow and mixed downstream-wise with a distorted shock wave structure. Furthermore, increasing the clearance size causes the distortion of the shock wave structure near the end-wall, while the shock wave intensity near mid-span is increased. Meanwhile, the clearance leakage flow and shock wave can cause the static pressure of the nozzle vane exit to fluctuate violently.
CitationLei, X., Qi, M., Sun, H., Shi, X. et al., "Study on the Interaction of Clearance Flow and Shock Wave in a Turbine Nozzle," SAE Technical Paper 2017-01-1039, 2017, https://doi.org/10.4271/2017-01-1039.
Data Sets - Support Documents
|[Unnamed Dataset 1]|
- Ma Chaochen, Zhu Qing Yang, . A study on variable geometry turbocharger with sliding shutter structure [J]. Transactions of CSICE, 1997, 15(2):253-257.
- Dale A P, Watson N. Vaneless radial turbine performance[C]. IMechE, Conf Turbocharging and Turbochargers, 1998, Paper C110/86.
- Spence S W T, O’ neill J W, Cunningham G. An investigation of the flowfield through a variable geometry turbine stator with Vane end-wall clearance [J]. Proc. IMechE Part A: J.Power and Energy, 2006(220): 899-910.
- Hideaki T, Shinya G, Masaru U, . The effect of clearance flow of variable areanozzles on radial turbine performance[C]. ASME, GT2008-50461.
- Hideaki T, Masaru U, Akira I, . Study on flow fields in variable area nozzles for radial turbines [J]. IHI Engineering Review, 2007, 40(2): 89-97.
- Hayami H, Senoo Y, Hyun Y I. Effects of tip clearance of nozzle vanes on performance of radial turbine rotor [J]. Transactions of the ASME, 1990(112): 58-63.
- Hu, L., Sun, H., Yi, J., Curtis, E. , "Investigation of Nozzle Clearance Effects on a Radial Turbine: Aerodynamic Performance and Forced Response," SAE Technical Paper 2013-01-0918, 2013, 10.4271/2013-01-0918.
- Booth T C, Dodge P R, Hepworth H K. Rotor-tip leakage： part1-basic methodology [J]. ASME Journal of Engineering for Gas Turbines and Power, 1982, 104(1): 154-161.
- Bindon J P. The Measurement and formation of tip clearance loss [J]. ASME Journal of Turbomachinery, 1989, 111(3): 257-263.
- Chen H. Turbine wheel design for Garrett advanced variable geometry turbines for commercial vehicle applications[C]. Proc. 8th international conference of turbochargers and turbocharging, 2006, 317-327.
- YANG Ce, LIU Shang-tao, . Shock Wave Induced High Cycle Fatigue of Variable Guide Vanes Radial Turbine Blade [J]. Transactions of CSICE, 2013, 31(3): 261-267.
- YANG Ce, LIU Shang-Tao, . Variable Guide Vanes Radial Turbine Blade Surface Pressure Fluctuation Excitation Mechanism [J]. JOURNAL OF ENGINEERING THERMOPHYSICS, 2014, 35(1): 38-41.
- Kawakubo T. Unsteady Rotor-Stator Interaction of a radial-inflow turbine with variable nozzle vanes[C]. ASME Paper GT2010-23677, 2010.
- LI Hua, YANG Zang-jian, . Selection of object plane and arrangement of knife edge for a Schlieren system [J]. Journal of Experiments in Fluid Mechanics, 2011, 25(3):91-95.