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<p>Variable geometry turbines have excellent adaptability to variable operating conditions and are widely used in aerospace and marine engineering fields. However, the leakage flow leads to degradation of the variable geometry turbine performance. In this article, the aerodynamic performance of a variable geometry turbine with guide vane and rotor simultaneously installed winglets is calculated using computational fluid dynamics methods, and the turbine performance under different forms of winglet installation is compared and analyzed. The effects of the guide vane installation angle, the winglet width and thickness, and the filleting at the winglet-blade connection on turbine aerodynamic losses were investigated. The results show that the tip winglet weakens the leakage loss at the tip clearance, but also increases the flow loss in the middle of the channel. The winglet tip can improve the 1-stage isentropic efficiency by a maximum of 0.73% and the 1.5-stage isentropic efficiency by a maximum of 0.66%. Adding a&#xa0;fillet at the connection will reduce efficiency by about 0.10%. The width of the winglet is positively correlated with the turbine efficiency, while the thickness is negatively correlated.</p>

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Aerodynamic Performance Study of Variable Geometry Turbine with Winglet Tips

  • 期刊论文

  • 发表日期：

    2025年6月8日

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  • Hui Liu,
  • Minglin Xu,
  • Bo Zhou,
  • Guiyong Zhang,
  • Dezhi Ning

摘要

Variable geometry turbines have excellent adaptability to variable operating conditions and are widely used in aerospace and marine engineering fields. However, the leakage flow leads to degradation of the variable geometry turbine performance. In this article, the aerodynamic performance of a variable geometry turbine with guide vane and rotor simultaneously installed winglets is calculated using computational fluid dynamics methods, and the turbine performance under different forms of winglet installation is compared and analyzed. The effects of the guide vane installation angle, the winglet width and thickness, and the filleting at the winglet-blade connection on turbine aerodynamic losses were investigated. The results show that the tip winglet weakens the leakage loss at the tip clearance, but also increases the flow loss in the middle of the channel. The winglet tip can improve the 1-stage isentropic efficiency by a maximum of 0.73% and the 1.5-stage isentropic efficiency by a maximum of 0.66%. Adding a fillet at the connection will reduce efficiency by about 0.10%. The width of the winglet is positively correlated with the turbine efficiency, while the thickness is negatively correlated.