Abstract
The high intensity tumble motion has a significant effect on the combustion system and the thermal efficiency of gasoline engine. The tumble ratio and discharge coefficient of high tumble ratio intake ports with masking were simulated by CFD three-dimensional simulation. The influence of masking on the intake process was emphatically discussed. The width, height, radius fillet and circumferential range of masking were changed and then simulated. The results shown that, the tumble intensity at the low valve lift was greatly affected by the masking. The smaller width, higher height, smaller radius fillet and larger circumferential range are favorable for the higher tumble intensity in low valve lift and also higher in average tumble ratio. Among these parameters, masking height has much more effect on mean tumble ratio and mean discharge coefficient. When the valve lift exceed masking height, the difference of tumble ratio and discharge coefficient between intake ports decreased.
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