Streamwise and Radial Decomposition of a Turbulent Axisymmetric Jet
Planar PIV was used to acquired 10, 000 independent samples of the far field of a free, turbulent round air jet flow of exit Reynolds number 20,000. The objective was to test the two-point similarity theory of Ewing et al. . After applying the similarity mapping, two-point velocity correlation analysis showed independence of streamwise origin, confirming the hypothesized streamwise homogeneity in two-point similarity coordinates. The velocity data was subsequently spatially decomposed by applying Fourier transformation in the ‘homogenized’ streamwise direction and POD to obtain orthogonal basis functions in the radial direction.
KeywordsParticle Image Velocimetry Centerline Velocity Downstream Position Virtual Origin Orthogonal Basis Function
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- 2.Wänström, M.: Spatial Decompositions of a Fully Developed Turbulent Jet Sampled with Particle Image Velocimetry. Ph.D. diss., Chalmers U. of Tech., Gothenburg, Sweden (2009), http://www.turbulence-online.com