Effects of Variable Valve Lift on In-Cylinder Air Motion

Energies

Tianyou Wang²  Daming Liu¹  Gangde Wang²  Bingqian Tan²  Zhijun Peng² 

[1] School of Automotive and Transportation, Tianjin University of Technology and Education, Tianjin 300222, China;Stake Key Lab of Engines, Tianjin University, Tianjin 300072, China;

关键词: in-cylinder air motion;    swirl flow;    tumble flow;    variable valve lift (VVL);    particle image velocimetry (PIV);   

DOI  :  10.3390/en81212397

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.