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Energies 2019, 12(6), 1021; https://doi.org/10.3390/en12061021

Analysis of Different POD Processing Methods for SPIV-Measurements in Compressor Cascade Tip Leakage Flow

1
School of Energy and Power Engineering, Beihang University, Beijing 100191, China
2
Midea Corporate Research Center, Foshan 528300, China
*
Author to whom correspondence should be addressed.
Received: 15 January 2019 / Revised: 23 February 2019 / Accepted: 11 March 2019 / Published: 15 March 2019
(This article belongs to the Special Issue Fluid Flow and Heat Transfer)
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Abstract

Though the proper orthogonal decomposition (POD) method has been widely adopted in flow analysis, few publications have systematically studied the influence of different POD processing methods on the POD results. This paper investigates the effects of different decomposition regions and decomposition dimensionalities on POD decomposition and reconstruction concerning the tip flow in the compressor cascade. Stereoscopic particle image velocimetry (SPIV) measurements in the blade channel are addressed to obtain the original flow field. Through vortex core identification, development of the tip leakage vortex along the chord is described. Afterwards, each plane is energetically decomposed by POD. Using the identified vortex core center as the geometric center, the effects of different decomposition regions with respect to the vortex core are analyzed. Furthermore, the effects of different single velocity-components as well as their combination are compared. The effect of different decomposition regions on the mode 1 energy fraction mainly impacts the streamwise velocity component. Though the addition of W velocity component in the decomposition does change the spatial structures of high-order modes, it does not change the dynamic results of reconstruction using a finite number of POD modes. UV global analysis is better for capturing the kinetic physics of the tip leakage vortex (TLV) wandering. View Full-Text
Keywords: POD; tip leakage flow; decomposition region; decomposition dimensionalities; vortex identification; SPIV POD; tip leakage flow; decomposition region; decomposition dimensionalities; vortex identification; SPIV
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Shi, L.; Ma, H.; Wang, L. Analysis of Different POD Processing Methods for SPIV-Measurements in Compressor Cascade Tip Leakage Flow. Energies 2019, 12, 1021.

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