Nyong, O., Woolley, R. orcid.org/0000-0001-7268-8658, Blakey, S. et al. (1 more author) (2017) Optimal piston crevice study in a rapid compression machine. In: IOP Conference Series: Materials Science and Engineering. 2nd International Conference on Computational Fluid Dynamics in Research and Industry (CFDRI 2017), 03-04 Aug 2017, Songhkla, Thailand. Institute of Physics
Abstract
Multi-dimensional effects such as vortex generation and heat losses from the gas to the wall of the reactor chamber have been an issue to obtaining a reliable RCM data. This vortex initiates a flow in the relatively cold boundary layer, which may penetrate the core gas. This resulting non-uniformity of the core region could cause serious discrepancies and give unreliable experimental data. To achieve a homogenous temperature field, an optimised piston crevice was designed using CFD modelling (Ansys fluent). A 2-Dimensional computational moving mesh is assuming an axisymmetric symmetry. The model adopted for this calculation is the laminar flow model and the fluid used was nitrogen. To get the appropriate crevice volume suitable for the present design, an optimisation of the five different crevice volume was modelled which resulted to about 2-10% of the entire chamber volume. The use of creviced piston has shown to reduce the final compressed gas temperature and pressure in the reactor chamber. All the crevice volumes between 2-10% of the chamber volume adequately contained the roll up vortexes, but the crevice volume of 282 mm 3 was chosen to be the best in addition to minimising the end gas pressure and temperature drop. The final pressure trace from experiment shows a reasonable agreement with the CFD model at compression and post compression stage.
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Item Type: | Proceedings Paper |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence (https://creativecommons.org/licenses/by/3.0/). Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Mechanical Engineering (Sheffield) The University of Sheffield > Faculty of Engineering (Sheffield) > Multidisciplinary Engineering Education (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 20 Dec 2017 12:14 |
Last Modified: | 20 Dec 2017 12:14 |
Published Version: | https://doi.org/10.1088/1757-899X/243/1/012018 |
Status: | Published |
Publisher: | Institute of Physics |
Refereed: | Yes |
Identification Number: | 10.1088/1757-899X/243/1/012018 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:125373 |
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