A study on the effects of intake port eccentricity and a partition between the two intake ports on the in-cylinder swirl characteristics in a valve diesel engine

Title & Authors
A study on the effects of intake port eccentricity and a partition between the two intake ports on the in-cylinder swirl characteristics in a valve diesel engine
Lee, Ji-Geun; Gang, Sin-Jae; No, Byeong-Jun;

Abstract
The effects of intake port eccentricity and a partition between the two intake ports on the incylinder swirl characteristics in a 4 valve diesel engine having the two intake ports, one is a helical intake port and the other is a tangential intake port, were investigated by using the impulse swirl meter(ISM) in a steady flow test rig. Mean flow coefficient ( $\small{C_{f(mean)}}$, swirl ratio ( $\small{R_{s}}$) and the mass flowrate through the two intake ports with and without intake port partition were measured. The results showed that the characteristics of in-cylinder swirl ratio formed by a 4-valve cylinder head were largely affected by valve eccentricity ratio ( $\small{N_{y}}$) and the existence of an intake port partition between the two intake ports. Mean flow coefficient ( $\small{C_{f(mean)}}$) increases and swirl ratio ( $\small{R_{s}}$) decreases in case of being the partition between the two intake ports. And also the mass flowrate through the tangential intake port is 19.0% and 7.7% more than that of the helical intake port in case of the two intake ports with and without partition respectively.ively.
Keywords
4-Valve Desel Engine;Valve Eccentricity Ratio;Intake Port Partition;Mean Flow Coefficient;Ricardo Swirl Ratio;ISM;Ny; $\small{C_{}}$ f(mean)/; $\small{R_{}}$ s/;Impulse Swirl meter;
Language
Korean
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