Dynamics and control of high-reynolds-number flow over open cavities
Dynamics and control of high-reynolds-number flow over open cavities
复制标题
DOI：
10.1146/annurev.fluid.38.050304.092057
复制
发表时间：
2006
影响因子：
27.7
通讯作者：
C. Rowley;David R. Williams
中科院分区：
文献类型：
--
作者：
C. Rowley;David R. Williams
我们回顾了最近的进展，在理解，建模和控制振荡的流动过去的空腔。空腔流动振荡的基本机制已经知道了至少40年，但以可靠和鲁棒的方式抑制这些振荡仍然是今天的挑战。空泡流动的控制是航空航天领域的一个重要研究课题，但同时空泡流动也是一个典型的流动控制问题。重点是最近的进展，这些流动建模，并在控制它们，使用开环和闭环技术。一个相对较新的观点是，空腔振荡可能并不总是自我维持的，但在某些流动条件下，可能是轻微阻尼共振，由外部扰动（如边界层湍流）维持。我们的理解是不完整的，值得进一步研究的领域，进行了讨论，特别是高频开环强迫的影响，反馈控制的基本限制，为一个给定的配置传感器和执行器，和发展的反馈设计方法，尊重有限的范围内的有效性可用的动态模型。
We review recent advances in understanding, modeling, and controlling oscillations in the flow past a cavity. The fundamental mechanisms underlying cavity flow oscillations have been known for at least 40 years, but suppressing these oscillations in a reliable and robust way is still a challenge today. Interest in controlling the flow past a cavity is motivated by aerospace applications, but in addition, cavity flows provide an attractive canonical problem for exploring general flow control techniques. The focus is on recent advances in modeling these flows, and in controlling them, using both open-loop and closed-loop techniques. A relatively new perspective is that cavity oscillations may not always be self-sustained, but under some flow conditions may be lightly damped resonances, sustained by external disturbances such as boundary layer turbulence. Areas in which our understanding is incomplete, and which deserve further study, are discussed, in particular the effects of high-frequency open-loop forcing, fundamental limitations of feedback control for a given configuration of sensors and actuators, and the development of a feedback design methodology that respects the limited range of validity of the available dynamical models.