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首页> 外文会议>ASME turbo expo: turbine technical conference and exposition >METHODS FOR THE EXTRACTION AND ANALYSIS OF THE GLOBAL MODE IN SWIRLING JETS UNDERGOING VORTEX BREAKDOWN
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METHODS FOR THE EXTRACTION AND ANALYSIS OF THE GLOBAL MODE IN SWIRLING JETS UNDERGOING VORTEX BREAKDOWN

机译：涡旋破坏下旋涡飞机整体模式的提取与分析方法

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摘要

Swirling jets undergoing vortex breakdown are widely used in combustion applications, due to their ability to provide aerodynamic flame stabilization. It is well known that vortex breakdown is accompanied by a dominant coherent structure, the so called precessing vortex core (PVC). Reports on the impact of the PVC on the combustion process range from beneficial to detrimental. In any event, efficient methods for the analysis of the PVC help to increase the benefit or reduce the penalty resulting from it. This study uses Particle Image Velocimetry (PIV) measurements of a generic non-isothermal swirling jet to demonstrate the use of advanced data analysis techniques. In particular, the Finite Time Lyapunov Exponent (FTLE) and local linear stability analysis (LSA) are shown to reveal deep insight into the physical mechanisms that drive the PVC. Particularly, it is demonstrated that the PVC amplitude is strongly reduced, if heating is applied at the wavemaker of the flow. These techniques are complemented by the traditionally used Proper Orthogonal Decomposition (POD) and spatial correlation techniques. It is demonstrated how these methods complement each other and lead to a comprehensive understanding of the PVC that lays out the path to efficient control strategies.
机译：遭受涡流破坏的旋流射流由于其提供空气动力学火焰稳定的能力而被广泛用于燃烧应用中。众所周知，涡旋破裂伴随着主导的相干结构，即所谓的旋进涡旋核（PVC）。关于聚氯乙烯对燃烧过程的影响的报道从有益到有害。无论如何，有效的PVC分析方法有助于增加收益或减少由此带来的损失。这项研究使用普通非等温旋流喷嘴的粒子图像测速（PIV）测量来证明先进数据分析技术的使用。特别是，有限时间李雅普诺夫指数（FTLE）和局部线性稳定性分析（LSA）可以揭示出驱动PVC的物理机理的深刻见解。特别地，证明了如果在流的波发生器处施加加热，则PVC振幅被大大降低。这些技术得到了传统使用的正确正交分解（POD）和空间相关技术的补充。演示了这些方法如何相互补充，并导致对PVC的全面理解，从而为有效的控制策略铺平了道路。

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