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Highly Resolved Large Eddy Simulation Study of Gap Size Effect on Low-Pressure Turbine Stage

唤醒 机械 湍流动能 定子 转子(电动) 材料科学 大涡模拟 涡轮机 前沿 边界层 物理 动能 湍流 经典力学 热力学 量子力学
作者
Richard Pichler,Vittorio Michelassi,Richard D. Sandberg,Jonathan Ong
出处
期刊:Journal of turbomachinery [ASM International]
卷期号:140 (2) 被引量:20
标识
DOI:10.1115/1.4038178
摘要

Blade-to-blade interactions in a low-pressure turbine (LPT) were investigated using highly resolved compressible large eddy simulations (LESs). For a realistic setup, a stator and rotor configuration with profiles typical of LPTs was used. Simulations were conducted with an in-house solver varying the gap size between stator and rotor from 21.5% to 43% rotor chord. To investigate the effect of the gap size on the prevailing loss mechanisms, a loss breakdown was conducted. It was found that in the large gap (LG) size case, the turbulence kinetic energy (TKE) levels of the stator wake close to the rotor leading edge were only one third of those in the small gap (SG) case, due to the longer distance of constant area mixing. The small time-averaged suction side separation on the blade, found in the LG case, disappeared in the SG calculations, confirming how stronger wakes can keep the boundary layer attached. The higher intensity wake impinging on the blade, however, did not affect the time-averaged losses calculated using the control volume approach of Denton. On the other hand, losses computed by taking cross sections upstream and downstream of the blade revealed a greater distortion loss generated by the stator wakes in the SG case. Despite the suction side separation suppression, the SG case gave higher losses overall due to the incoming wake turbulent kinetic energy amplification along the blade passage.
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