Effects of Variable Valve Lift on In-Cylinder Air Motion
| Autor: | Gangde Wang, Daming Liu, Bingqian Tan, Tianyou Wang, Zhijun Peng |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
in-cylinder air motion
swirl flow tumble flow variable valve lift (VVL) particle image velocimetry (PIV) Control and Optimization Materials science Flow (psychology) Energy Engineering and Power Technology lcsh:Technology law.invention Cylinder (engine) Piston Valve seat law Electrical and Electronic Engineering Engineering (miscellaneous) Simulation Renewable Energy Sustainability and the Environment lcsh:T Mechanics Compression (physics) Dead centre Particle image velocimetry Flow velocity Energy (miscellaneous) |
| Zdroj: | Energies, Vol 8, Iss 12, Pp 13778-13795 (2015) Energies Volume 8 Issue 12 Pages 13778-13795 Energies; Volume 8; Issue 12; Pages: 13778-13795 |
| ISSN: | 1996-1073 |
| Popis: | An investigation into in-cylinder swirl and tumble flow characteristics with reduced maximum valve lifts (MVL) is presented. The experimental work was conducted in the modified four-valve optical spark-ignition (SI) test engine with three different MVL. Particle image velocimetry (PIV) was employed for measuring in-cylinder air motion and measurement results were analyzed for examining flow field, swirl and tumble ratio variation and fluctuating kinetic energy distribution. Results of ensemble-averaged flow fields show that reduced MVL could produce strong swirl flow velocity, then resulted in very regular swirl motion in the late stage of the intake process. The strong swirl flow can maintain very well until the late compression stage. The reduction of MVL can also increase both high-frequency and low-frequency swirl flow fluctuating kinetic energy remarkably. Regarding tumble flow, results demonstrate that lower MVLs result in more horizontal intake flow velocity vectors which can be easily detected under the valve seat area. Although the result of lower MVLs show a higher tumble ratio when the piston is close to the bottom dead centre (BDC), higher MVLs substantially produce higher tumble ratios which can be confirmed when most cylinder area lies in the measuring range. |
| Databáze: | OpenAIRE |
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