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Tumble Flow Measurements Using Three Different Methods and its Effects on Fuel Economy and Emissions
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 16, 2006 by SAE International in United States
Annotation ability available
In-cylinder flows such as tumble and swirl have an important role on the engine combustion efficiencies and emission formations. In particular, the tumble flow which is dominant in current high performance gasoline engines has an important effect on the fuel consumptions and exhaust emissions under part load conditions. Therefore, it is important to understand the effect of the tumble ratio on the part load performance and optimize the tumble ratio for better fuel economy and exhaust emissions. First step in optimizing a tumble flow is to measure a tumble ratio accurately. In this research the tumble ratio was measured, compared, and correlated using three different measurement methods: steady flow rig, 2-Dimensional PIV (Particle Image Velocimetry), and 3-Dimensional PTV (Particle Tracking Velocimetry). Engine dynamometer test was also conducted to find out the effect of the tumble ratio on the part load performance. Dynamometer test results of high tumble ratio engine showed faster combustion speed, retarded MBT timing, higher exhaust emissions, and a better lean burn sustainability. Lean limit of the baseline engine was expanded from A/F=18:1 to A/F=21:1 by increasing a tumble ratio using MTV (Manifold Throttle Valve).
CitationKim, M., Lee, S., and Kim, W., "Tumble Flow Measurements Using Three Different Methods and its Effects on Fuel Economy and Emissions," SAE Technical Paper 2006-01-3345, 2006, https://doi.org/10.4271/2006-01-3345.
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