TY - JOUR
T1 - A study on the effects of the intake port configurations on the swirl flow generated in a small D.I. diesel engine
AU - Kim, Yungjin
AU - Han, Yongtaek
AU - Lee, Kihyung
N1 - Funding Information:
This work was supported by the research fund of Hanyang University(HY-2012-P)
PY - 2014/6
Y1 - 2014/6
N2 - This paper investigates the effect of intake port configuration on the swirl that is generated within a direct injection (D.I.) diesel engine. The in-cylinder flow characteristics are known to have significant effects on fuel-air mixing, combustion, and emissions. To clarify how to intensify the swirl flow, a swirl control valve (SCV) and a bypass were selected as design parameters for enhancing the swirl flow. The optimal intake port shape was also chosen as a parameter needed to efficiently generate a high swirl ratio. The results revealed that a key factor in generating a high swirl ratio was to control the intake airflow direction passing through the intake valve seat. Further, the swirl intensity was influenced by changing the distance between the helical and tangential ports, and the swirl flow was changed by the presence of a bypass near the intake valve seat. Additionally, the effect of intake port geometry on the in-cylinder flow field was investigated by using a laser sheet visualization method. The experimental results showed a correlation of swirl ratio and mass flow rate. In addition, we found that employing the bypass was an effective method to increase swirl ratio without sacrificing mass flow rate.
AB - This paper investigates the effect of intake port configuration on the swirl that is generated within a direct injection (D.I.) diesel engine. The in-cylinder flow characteristics are known to have significant effects on fuel-air mixing, combustion, and emissions. To clarify how to intensify the swirl flow, a swirl control valve (SCV) and a bypass were selected as design parameters for enhancing the swirl flow. The optimal intake port shape was also chosen as a parameter needed to efficiently generate a high swirl ratio. The results revealed that a key factor in generating a high swirl ratio was to control the intake airflow direction passing through the intake valve seat. Further, the swirl intensity was influenced by changing the distance between the helical and tangential ports, and the swirl flow was changed by the presence of a bypass near the intake valve seat. Additionally, the effect of intake port geometry on the in-cylinder flow field was investigated by using a laser sheet visualization method. The experimental results showed a correlation of swirl ratio and mass flow rate. In addition, we found that employing the bypass was an effective method to increase swirl ratio without sacrificing mass flow rate.
KW - HSDI(high speed direct injection)
KW - ISM(impulse swirl meter)
KW - PIV(particle image velocimetry)
KW - helical intake port
KW - intake flow rate
KW - swirl ratio
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U2 - 10.1007/s11630-014-0710-x
DO - 10.1007/s11630-014-0710-x
M3 - Article
AN - SCOPUS:84901192459
SN - 1003-2169
VL - 23
SP - 297
EP - 306
JO - Journal of Thermal Science
JF - Journal of Thermal Science
IS - 3
ER -