Interpretation of Experimental In-Cylinder Flow Structures SAE Paper Final Lboro.pdf (5.62 MB)
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Experimental Interpretation of Compression Ignition In-Cylinder Flow Structures

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conference contribution
posted on 24.09.2020, 10:42 by Tristan Knight, Edward LongEdward Long, Ruoyang Yuan, Colin Garner, Graham Hargrave
© 2020 Loughborough University. Understanding and predicting in-cylinder flow structures that occur within compression-ignition engines is vital if further optimisation of combustion systems is to be achieved. To enable this prediction, fully validated computational models of the complex turbulent flow-fields generated during the intake and compression process are needed. However, generating, analysing and interpreting experimental data to achieve this validation remains a complex challenge due to the variability that occurs from cycle to cycle. The flow-velocity data gathered in this study, obtained from a single-cylinder CI engine with optical access using high-speed PIV, demonstrates that significantly different structures are generated over different cycles, resulting in the mean flow failing to adequately reflect the typical flow produced in-cylinder. Additionally, this high level of variability is shown by the work to impact the assessment of turbulence throughout the cycle, influencing the values often used to validate mathematical models. The original work in this paper analyses experimental PIV data from the single cylinder engine, to characterise the differences between individual cycles' bulk flow structures and the resultant turbulent fields. The analysis approach presented uses proper orthogonal decomposition (POD) and spatial filtering to interpret the progression of the flow structures and energy throughout compression, giving an understanding of the actual flow structures that are most likely to be produced in the engine. This analysis of the data provides a meaningful understanding of the nature of the bulk flow variations and how the turbulent field develops over a given cycle, from the intake stroke to the end of compression.

Funding

Advanced Propulsion Centre UK in the framework of the APC3 Project 113059 – ASCENT (Advanced Systems for Carbon Emission reduction through New Technology).

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

SAE Technical Papers

Pages

2020-01-0791

Source

WCX SAE World Congress Experience

Publisher

SAE

Version

AM (Accepted Manuscript)

Rights holder

© Loughborough University

Publisher statement

This paper was accepted for publication in the SAE Technical Papers and the definitive published version is available at https://doi.org/10.4271/2020-01-0791

Publication date

2020-04-14

Copyright date

2020

ISSN

0148-7191

eISSN

2688-3627

Language

en

Location

Detroit, USA

Event dates

April 13-15th 2021

Depositor

Mr Tristan Knight Deposit date: 21 September 2020

Article number

2020-01-0791

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