Volume 40 Issue 1
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XU Minglin, ZHANG Binbin, LIU Zhengyuan, et al. Influences of different design parameters on aerodynamic performance of variable geometry turbine[J]. Journal of Aerospace Power, 2025, 40（1）：20230192 doi: 10.13224/j.cnki.jasp.20230192
Citation: XU Minglin, ZHANG Binbin, LIU Zhengyuan, et al. Influences of different design parameters on aerodynamic performance of variable geometry turbine[J]. Journal of Aerospace Power, 2025, 40（1）：20230192 doi: 10.13224/j.cnki.jasp.20230192
shu

Influences of different design parameters on aerodynamic performance of variable geometry turbine

doi: 10.13224/j.cnki.jasp.20230192
  • 1.

    State Key Laboratory of Structural Analysis for Industrial Equipment，School of Naval Architecture and Ocean Engineering，Dalian University of Technology，Dalian Liaoning 116024，China

  • 2.

    Technical Center，COSCO Shipping Heavy Industry Company Limitd，Dalian Liaoning 116113，China

  • Received Date: 2023-03-28
    Available Online: 2024-03-27
    Abstract

  • To explore the possibility of improving the efficiency of variable geometry turbines, the effects of the pivot diameter coefficient, pivot cross-sectional shape, end clearance, and spacing between stator and rotor on turbine aerodynamic performance were investigated by numerical simulation at rotor speed of 2700 r/min and guide vane rotation angles of −5.0°, −2.5°, 0°, +2.5°, and +5.0°. And the sensitivity of isentropic efficiency to the above design parameters and the field mechanism were analyzed. The results showed that the isentropic efficiency could be improved by 0.064% for each 1.0% increase in the diameter coefficient D/L. The rhombic section had the best improvement in turbine efficiency, and the isentropic efficiency improvement was above 0.8% at different guide vane rotation angles. The end clearance was the most sensitive parameter to the turbine efficiency. When the end clearance increased from 0.5% to 1.0% span, the isentropic efficiency decreased by a minimum of 2.08% and a maximum of 4.54%. Increasing the spacing between the stator and rotor could improve the turbine performance to some extent, and decreasing the spacing was detrimental to turbine efficiency. Suitable design parameters can effectively improve the efficiency of variable geometry turbines at low speeds.

     

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