An investigation into in-cylinder tumble flow characteristics with variable valve lift in a gasoline engine
Issue Date
2014-10-31Subjects
Particle image velocimetry (PIV)Variable valve lift (VVL)
gasoline engine
tumble flow
in-cylinder air motion
Subject Categories::H150 Engineering Design
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In this paper, the investigation into in-cylinder tumble flow characteristics with reduced Maximum Valve Lifts (MVL) is presented. The experimental work was conducted in a modified four-valve Spark-Ignition (SI) test engine, with optical accesses for measuring in-cylinder air motion in the vertical direction. Three different MVL of 6.8 mm, 4.0 mm and 1.7 mm were tested and Particle Image Velocimetry (PIV) was employed for those measurements. Measurement results were analysed by examining the tumble flow field, the tumble ratio variation and the fluctuating kinetic energy distribution. Meanwhile, a numerical analysis method for detecting the vortex centre was developed. From results of the vortex centre distribution, the cyclic variation of the in-cylinder flow was explored. The phase-averaged flow fields show that higher MVLs could produce stronger vertical flows which turn more toward to the piston top and finally are possible to form big scale tumble flow structure. Although lower MVLs create a higher tumble ratio when the piston is close to the Bottom Dead Centre (BDC), higher MVLs substantially produce higher tumble ratios when the piston is moving close to the Top Dead Centre (TDC). In terms of kinetic energy, lower MVLs result in higher values including higher total kinetic energy and higher fluctuating energy. Finally, the vortex centres results demonstrate lower MVLs could enhance cycle-to-cycle variation due to the weakened tumble vortex.Citation
Wang T, Liu D, Tan B, Wang G, Peng Z (2015) 'An investigation into in-cylinder tumble flow characteristics with variable valve lift in a gasoline engine', Flow, Turbulence and Combustion, 94 (2), pp.285-304.Publisher
Kluwer Academic PublishersJournal
Flow, Turbulence and CombustionAdditional Links
https://link.springer.com/article/10.1007/s10494-014-9562-4Type
ArticleLanguage
enISSN
1386-6184ae974a485f413a2113503eed53cd6c53
10.1007/s10494-014-9562-4
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