On the Application of Proper Orthogonal Decomposition (POD) for In-Cylinder Flow Analysis

Mohammed El-Adawy, Morgan R. Heikal, A. Rashid A. Aziz, Ibrahim Khalil Adam, Mhadi A. Ismael, Mohammed E. Babiker, Masri B. Baharom, Firmansyah and Ezrann Zharif Zainal Abidin
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Mohammed El-Adawy: Centre for Automotive Research and Electric Mobility, Mechanical Engineering Department, Universiti Teknologi PETRONAS 32610, Seri Iskandar, Perak, Malaysia
Morgan R. Heikal: Centre for Automotive Research and Electric Mobility, Mechanical Engineering Department, Universiti Teknologi PETRONAS 32610, Seri Iskandar, Perak, Malaysia
A. Rashid A. Aziz: Centre for Automotive Research and Electric Mobility, Mechanical Engineering Department, Universiti Teknologi PETRONAS 32610, Seri Iskandar, Perak, Malaysia
Ibrahim Khalil Adam: Centre for Automotive Research and Electric Mobility, Mechanical Engineering Department, Universiti Teknologi PETRONAS 32610, Seri Iskandar, Perak, Malaysia
Mhadi A. Ismael: Centre for Automotive Research and Electric Mobility, Mechanical Engineering Department, Universiti Teknologi PETRONAS 32610, Seri Iskandar, Perak, Malaysia
Mohammed E. Babiker: Centre for Automotive Research and Electric Mobility, Mechanical Engineering Department, Universiti Teknologi PETRONAS 32610, Seri Iskandar, Perak, Malaysia
Masri B. Baharom: Centre for Automotive Research and Electric Mobility, Mechanical Engineering Department, Universiti Teknologi PETRONAS 32610, Seri Iskandar, Perak, Malaysia
Firmansyah: Centre for Automotive Research and Electric Mobility, Mechanical Engineering Department, Universiti Teknologi PETRONAS 32610, Seri Iskandar, Perak, Malaysia
Ezrann Zharif Zainal Abidin: Centre for Automotive Research and Electric Mobility, Mechanical Engineering Department, Universiti Teknologi PETRONAS 32610, Seri Iskandar, Perak, Malaysia

Energies, 2018, vol. 11, issue 9, 1-22

Abstract: Proper orthogonal decomposition (POD) is a coherent structure identification technique based on either measured or computed data sets. Recently, POD has been adopted for the analysis of the in-cylinder flows inside internal combustion engines. In this study, stereoscopic particle image velocimetry (Stereo-PIV) measurements were carried out at the central vertical tumble plane inside an engine cylinder to acquire the velocity vector fields for the in-cylinder flow under different experimental conditions. Afterwards, the POD analysis were performed firstly on synthetic velocity vector fields with known characteristics in order to extract some fundamental properties of the POD technique. These data were used to reveal how the physical properties of coherent structures were captured and distributed among the POD modes, in addition to illustrate the difference between subtracting and non-subtracting the ensemble average prior to conducting POD on datasets. Moreover, two case studies for the in-cylinder flow at different valve lifts and different pressure differences across the air intake valves were presented and discussed as the effect of both valve lifts and pressure difference have not been investigated before using phase-invariant POD analysis. The results demonstrated that for repeatable flow pattern, only the first mode was sufficient to reconstruct the physical properties of the flow. Furthermore, POD analysis confirmed the negligible effect of pressure difference and subsequently the effect of engine speed on flow structures.

Keywords: in-cylinder flow; coherent structures; POD; PIV (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (7)

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