LES Study of the Effects of Oscillations in the Main Flow on Film Cooling

S. Baek, Joon Ahn
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引用次数: 1

Abstract

The effects of sinusoidal oscillations in the main flow on film cooling in the gas turbine were investigated by Large Eddy Simulation (LES). The film cooling flow fields for the sinusoidal oscillation of 32 Hz in the mainstream from a cylindrical hole inclined by 35° to a flat plate at average blowing ratio of M = 0.5 were numerically simulated. The LES results were compared to the experimental data from Seo, Lee and Ligrani (1998), Jung, Lee and Ligrani (2001) and Reynolds-Averaged Navier-Stokes (RANS) results. The experimental results showed that if the oscillation frequency in the main flow was increased, the adiabatic film cooling effectiveness was decreased. The credibility of the LES results relative to the experimental data was demonstrated by the comparison of time-averaged adiabatic film cooling effectiveness, time and phase-averaged temperature contours, contours of Q-criterion, time-averaged velocity profiles, and time and phase-averaged Urms profiles with the RANS results. The adiabatic film cooling effectiveness by LES model showed a good match to the experimental data, while RANS results highly over-predict the centerline effectiveness. Also, the LES results showed more consistent with the experimental data for the time-averaged and phase-averaged temperature contours, time-averaged velocity profiles and time and phase-averaged Urms profiles than the RANS results. RANS did not predict the peak generated by the jet penetration exactly and Urms profiles obtained by RANS approach was much smaller compared to the experimental results. Paper will discuss these results in detail.
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主流振荡对气膜冷却影响的LES研究
采用大涡模拟方法研究了主流正弦振荡对燃气轮机气膜冷却的影响。数值模拟了平均吹气比M = 0.5时,主流从倾斜35°的圆柱孔向平板正弦振荡32 Hz时的气膜冷却流场。将LES结果与Seo, Lee和Ligrani (1998), Jung, Lee和Ligrani(2001)的实验数据以及reynolds - average Navier-Stokes (RANS)结果进行了比较。实验结果表明,随着主流振荡频率的增加,绝热膜冷却效果降低。通过时间平均绝热膜冷却效率、时间和相位平均温度曲线、q准则曲线、时间平均速度曲线、时间和相位平均Urms曲线与RANS结果的比较,证明了LES结果相对于实验数据的可信度。采用LES模型计算的绝热膜冷却效率与实验数据吻合较好,而采用RANS模型计算的结果严重高估了中心线冷却效率。在时间平均和相位平均温度曲线、时间平均速度曲线和时间平均和相位平均Urms曲线上,LES结果比RANS结果更符合实验数据。RANS方法不能准确预测射流侵彻产生的峰值,得到的Urms曲线与实验结果相比要小得多。本文将详细讨论这些结果。
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