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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2022, Vol. 43 ›› Issue (7): 125427-125427.doi: 10.7527/S1000-6893.2021.25427

• Fluid Mechanics and Flight Mechanics • Previous Articles     Next Articles

Uncertainty impact of Reynolds number on flow losses of high-lift low-pressure turbine cascade

LUO Jiaqi1, FU Wenhao1, ZENG Xian1, XIA Zhiheng2   

  1. 1. School of Aeronautics and Astronautics, Zhejiang University, Hangzhou 310027, China;
    2. China Aerodynamics Research and Development Center, Mianyang 621000, China
  • Received:2021-03-01 Revised:2021-03-30 Published:2021-03-26
  • Supported by:
    National Nature Science Foundation of China (51676003, 51976183); National Science and Technology Major Project (J2019-II-0012-0032); Natural Science Foundation of Zhejiang Province (LXR22E060001)

Abstract: The Reynolds number of the high-lift Low-Pressure Turbine(LPT) is small when the aircraft is cruising at a high altitude. Under the effect of the adverse pressure gradient, laminar flow separation and transition tend to occur on the suction side, deteriorating the aerodynamic performance of LPTs. The uncertainty impact of Reynolds number variations on the flow losses of high-lift LPTs is investigated in this study. The flow of a high-lift LPT cascade is first numerically simulated by solving the γ-Reθt transition model equations. The computed flow losses are then analyzed, and compared with the experimental results to evaluate the reliability of the numerical results. Then the effects of the Reynolds number on the Kinetic Energy Loss Coefficient(KELC) are studied with different turbulent intensities. An adaptive surrogate model with a high response accuracy is constructed, which is applied to the calculation of the statistical mean and variance of KELC, and the study of the uncertainty impact of the Reynolds number on KELC. Statistical analysis of flow solutions by Monte Carlo simulation is finally presented. The investigation into the influence of Reynolds number variations on flow separation and transition demonstrates the mechanisms of uncertainty impact on the flow losses of high-lift LPTs.

Key words: uncertainty, low-pressure turbines, Reynolds number, flow losses, boundary-layer separation transitionhttp

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