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Phase Invariant Proper Orthogonal Decomposition for the Study of a Compressed Vortex

Phase Invariant Proper Orthogonal Decomposition for the Study of a Compressed Vortex
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摘要 We propose here an experimental investigation of a vortex submitted to a radial perturbation while being compressed. This experiment reproduces a model situation of the complex flows that take place in a real engine cylinder. An isolated tumbling flow is first submitted to an injection of fluid and then compressed and measurements are realised by Particle Image Velocimetry (PIV). The Proper Orthogonal Decomposition is known to be an unbiased method to identify the coherent structures of turbulent flows. It is possible to make this decomposition for a given phase or to create a set of basis functions with the whole set of compression stroke velocity fields.First, the experimental set-up will be presented, then the second part provides the POD principle. Results of phased POD decomposition of the compression of the unperturbated vortex will be presented. Finally results from the time invariant POD will be discussed to study the influence of the jet perturbation in the compression of a vortex.
出处 《Journal of Thermal Science》 SCIE EI CAS CSCD 2005年第2期108-113,共6页 热科学学报(英文版)
关键词 TURBULENCE POD PIV cycle to cycle fluctuations. 循环波动 涡流 射流摄动 发动机气缸 PIV
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参考文献8

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