TY - JOUR
T1 - Unravelling tumble and swirl in a unique water-analogue engine model
AU - Kalpakli Vester, Athanasia
AU - Nishio, Yu
AU - Alfredsson, P. Henrik
N1 - Funding Information:
This study has been part of the Fordonsstrategisk Forskning och Innovation (FFI) project entitled ?Experimental Investigation of the In-Cylinder Flow During the Intake Stroke? supported by the Swedish Energy Agency. This project is a cooperation between KTH, Scania CV AB and Volvo GTT. Dr. Bj?rn Lindgren from Scania CV AB is particularly thanked for providing the cylinder head. The authors are thankful to Dr. N. Tillmark for playing a key role in the design of the setup. The authors would also like to thank the Odqvist laboratory for experimental mechanics at KTH for providing the SPIV system. The second author would like to thank Graduate School of Engineering, Tohoku University for the financial support during his stay at KTH.
Publisher Copyright:
© 2018, The Author(s).
PY - 2018/8/1
Y1 - 2018/8/1
N2 - Abstract: The in-cylinder flow prior to combustion is considered to be one of the most important aspects controlling the combustion process in an engine. More specifically, the large-scale structures present in the cylinder, so-called tumble and swirl, before compression are believed to play a major role into the mixing and combustion processes. Their development during the intake stroke and their final strength depend mainly (but not only) on the inlet port design. In the present study, the turbulent large-scale structures during the intake stroke are investigated in a unique water-analogue engine where inlet ports and valve timings can easily be configured and tested. The flow field in the cylinder volume is reconstructed through multi-planar stereoscopic particle image velocimetry measurements which reveal a wealth of vortical structures during the stroke’s various phases. The aim of the present paper is to present and show results from a unique setup which can serve as a test bench for optimisation of inlet port designs to obtain a desired vortical pattern in the cylinder after the intake stroke is finished. This setup can simulate the intake stroke in a much more realistic way as compared to a through-flow setup with a fixed valve lift. Graphical Abstract: [Figure not available: see fulltext.].
AB - Abstract: The in-cylinder flow prior to combustion is considered to be one of the most important aspects controlling the combustion process in an engine. More specifically, the large-scale structures present in the cylinder, so-called tumble and swirl, before compression are believed to play a major role into the mixing and combustion processes. Their development during the intake stroke and their final strength depend mainly (but not only) on the inlet port design. In the present study, the turbulent large-scale structures during the intake stroke are investigated in a unique water-analogue engine where inlet ports and valve timings can easily be configured and tested. The flow field in the cylinder volume is reconstructed through multi-planar stereoscopic particle image velocimetry measurements which reveal a wealth of vortical structures during the stroke’s various phases. The aim of the present paper is to present and show results from a unique setup which can serve as a test bench for optimisation of inlet port designs to obtain a desired vortical pattern in the cylinder after the intake stroke is finished. This setup can simulate the intake stroke in a much more realistic way as compared to a through-flow setup with a fixed valve lift. Graphical Abstract: [Figure not available: see fulltext.].
KW - In-cylinder flow
KW - Stereoscopic particle image velocimetry
KW - Swirl
KW - Tumble
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U2 - 10.1007/s12650-018-0485-3
DO - 10.1007/s12650-018-0485-3
M3 - Article
AN - SCOPUS:85043715388
VL - 21
SP - 557
EP - 568
JO - Journal of Visualization
JF - Journal of Visualization
SN - 1343-8875
IS - 4
ER -