Abstract Flow separation control using unsteady pulsed suction through endwall bleeding holes in a highly loaded compressor cascade
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Flow separation control using unsteady pulsed suction through endwall bleeding holes in a highly loaded compressor cascade

机译：通过高负载压缩机叶栅端壁放气孔的不稳定脉冲抽吸进行流分离控制

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AbstractUnsteady pulsed suction (UPS) as a novel unsteady flow control (UFC) technique is applied in a certain highly loaded compressor cascade for the control of flow separations. Some related aerodynamic parameters such as excitation frequency and time-averaged suction flow rate are studied in detail. UPS and steady constant suction (SCS) are investigated to analysis comparatively the control effects of flow separations with the same time-averaged suction flow rate. The results show that UPS can provide appreciable improvement of cascade performance in a wide range of excitation frequencies. There are different optimum frequencies under different time-averaged suction flow rates, but the optimum frequencies are both an integer multiple of the natural frequency of vortex shedding. Based on the optimum frequency, the total pressure loss coefficients under the time-averaged suction flow ratesms=0.4%andms=0.53%are reduced by 9.4% and 14.2%, respectively. The time-averaged suction flow rate plays a more crucial role than the excitation frequency. Simultaneously, UPS can provide a better flow control effect than SCS with the same time-averaged suction flow rate in the control of flow separation. The time-averaged suction flow rate range that can obtain positive effects for UPS is wider than that for SCS. Additionally, the potentials of UPS at off-design points are also validated.
机译： 摘要 非定常脉冲吸力（UPS）作为一种新颖的非定常流量控制（UFC）技术被应用于某些高负荷的压缩机级联中，以控制流动分离。详细研究了一些相关的空气动力学参数，例如激励频率和时间平均吸力流速。研究了UPS和恒定恒压吸入（SCS），以比较分析相同时间平均吸入流量下的分流控制效果。结果表明，UPS可以在宽范围的激励频率下显着改善级联性能。在不同的时间平均吸入流量下，存在不同的最佳频率，但是最佳频率均为涡旋脱落自然频率的整数倍。基于最佳频率，时间平均抽吸流量下的总压力损失系数 m s = 0.4 ％< / mml：mtext> 和 m s = 0.53 ％

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