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

• 来源期刊: 热科学学报（英文版）
• 学科: 物理学
• 年，卷（期）: 2005,（2）
• 页码范围: 108-113
• 页数: 6页
• 分类号: O357.5+4
• 语种: 英文

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.