Abstract This paper presents an investigation on the cooling performance in a ribbed channel with the pulsating inlet flow. The flow structures and heat transfer characteristics are simulated by solving the three-dimensional Unsteady Reynolds-Averaged Navier-Stokes equations (U-RANS) and the Shear Stress Transport (SST) turbulence model coupled with the γ-Reθ transition. The influence of pulsating parameters in terms of pulsating amplitudes and frequencies on the cooling performance are evaluated at the Reynold number of 10000. The results obtained show that the coolant velocity variation corresponds to the inlet velocity variation, almost the sinusoidal curve shape. The heat transfer performance influenced by the turbulence intensity is also the sinusoidal curve shape and increases with increasing pulsating amplitudes and frequencies. The pressure loss penalty related to the flow characteristics is also the sinusoidal curve shape while the thermal performance indexes at four time frames (1T/4, 2T/4, 3T/4 and 4T/4) show the 90-degree phase difference with the sinusoidal curve. Additionally, the thermal performance increases with increasing pulsating amplitudes and frequencies.

中文翻译：

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脉动参数对进气脉动下燃气轮机叶片肋状通道内流动和传热特性时空变化的影响

摘要 本文研究了带有脉动入口流的带肋通道的冷却性能。通过求解三维非定常雷诺-平均纳维-斯托克斯方程 (U-RANS) 和剪切应力传递 (SST) 湍流模型以及 γ-Reθ 过渡来模拟流动结构和传热特性。在雷诺数为 10000 时评估了脉动参数在脉动幅度和频率方面对冷却性能的影响。获得的结果表明，冷却剂速度变化对应于入口速度变化，几乎是正弦曲线形状。受湍流强度影响的传热性能也是正弦曲线形状，并随着脉动幅度和频率的增加而增加。与流动特性相关的压力损失惩罚也是正弦曲线形状，而四个时间帧（1T/4、2T/4、3T/4和4T/4）的热性能指标显示出90度相位差。正弦曲线。此外，热性能随着脉动幅度和频率的增加而增加。