Influence of Different Reynolds Numbers on Aerodynamic Losses in Low Pressure Turbines

Research Area: Volume 10,Issue 3,May, 2021 Year: 2021
Type of Publication: Article Keywords: Reynolds Number, Total Pressure Loss, Channel Vortex, Numerical Simulation
Authors:
  • Yue Long
  • Wang Yun-fei
Journal: IJEIR Volume: 10
Number: 3 Pages: 141-148
Month: May
ISSN: 2277-5668
Abstract:
In order to understand the influence of aerodynamic losses in low-pressure turbines with different Reynolds numbers in more detail, the Reynolds average method (RANS) was adopted to calculate the flow fields in low-pressure turbines with Reynolds numbers of 0.6 × 105, 1.0 × 105, 2.0 × 105 and 3.0 × 105. The results show that the numerical simulation method adopted in this paper can describe the internal flows in low-pressure turbines more accurately. Under the low Reynolds number condition, the flow in the endzone is more complex, and the flow field parameters vary greatly at different blade heights, and the parameters tend to be stable at z/h = 0.5. The larger Reynolds number can reduce the size and strength of the passage vortex, the transverse pressure behind the blade suction surface, the total pressure loss behind the gate, the width of the wake region and the velocity loss, so as to reduce the aerodynamic loss of the whole blade.

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