通过数值模拟对压缩机定子叶片上的自驱动脉冲射流进行概念验证研究

Weiyu Lu, Qiulin Deng, Yanmei Jiao
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引用次数: 0

摘要

本研究提出了在压缩机定子叶片上进行自驱动脉冲喷流控制的新概念。这种被动式非稳态流量控制方法的优点是不需要外部流量或电源。本研究通过数值模拟对低速压缩机定子叶片进行了初步概念验证研究。当脉冲喷射频率为 100 Hz 时,控制性能和控制效率达到最佳,总压力损失系数降低了 8.9%。随着阀门转速的增加,脉冲射流的动量系数逐渐减小。自驱动脉冲射流的非稳态特性分析表明,射流速度接近于周期性方波信号,典型的射流速度降低值约为 0.15 至 0.8。此外,阀门上的时均驱动扭矩取决于转速,与这种被动流量控制方法的自启动和自驱动特性有关。在不同的轴承阻力矩下,自驱动阀门在三种情况下表现不同,即可以自启动和自驱动、不能自启动但可以自驱动、不能自启动也不能自驱动。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Proof of concept study on a self-driven pulsed jet on a compressor stator blade by numerical simulation
This study presents a new concept of self-driven pulsed jet flow control on a compressor stator blade. This passive unsteady flow control method has the advantage that neither external flow nor electrical source is needed. This study’s preliminary proof-of-concept study on a low-speed compressor stator blade is performed using numerical simulation. When the pulsed jet frequency is 100 Hz, the optimum control performance and control efficiency are reached, and the total pressure loss coefficient is reduced by 8.9%. As the valve’s rotational speed increases, the pulsed jet’s momentum coefficient decreases gradually. The analysis of the unsteady characteristics of the self-driven pulsed jet shows that the jet velocity is close to a periodic square wave signal, and the typical reduced jet velocity ranges from approximately 0.15 to 0.8. Moreover, the time-averaged driving torque on the valve depends on the rotational speed and is relevant to the self-starting and self-driven characteristics of this passive flow control method. Under different bearing resistance torque, the self-driven valve behaves differently in three cases that can self-start and be self-driven, cannot self-start but can be self-driven, and cannot self-start nor be self-driven.
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