TY - JOUR
T1 - Hole number effect on spray dynamics of multi-hole diesel nozzles
T2 - An observation from three- to nine-hole nozzles
AU - Huang, Weidi
AU - Moon, Seoksu
AU - Gao, Ya
AU - Wang, Jin
AU - Ozawa, Daisuke
AU - Matsumoto, Atsushi
N1 - Publisher Copyright:
© 2018 Elsevier Inc.
PY - 2019/4
Y1 - 2019/4
N2 - For the simplicity of optical diagnostics, studies on fuel spray and combustion characteristics of modern diesel engines have been conducted using the investigation nozzles having the reduced number of holes (two- or three-hole nozzles) compared to the production nozzles. However, the similarity of spray dynamics between the investigation nozzles and production nozzles has not been confirmed yet. Also, the hole-number effect on spray dynamics has been investigated only in a limited range of hole number making it difficult to derive the clear trend and understandings of the hole number effect. In this study, the hole-number effect on spray dynamics of multi-hole diesel nozzles has been investigated in a wide range of hole number with sufficient data points (three, five, six, eight, nine-hole) by using the X-ray Phase-Contrast Imaging technique. The non-linear trend in the spray structure, as well as the dynamics results, was observed as increasing the hole number regardless of injection pressure. Discussions were made accordingly to understand the observed result trend. The study suggests that great attention is needed when deciding the number of nozzle holes for the optimized engine combustion.
AB - For the simplicity of optical diagnostics, studies on fuel spray and combustion characteristics of modern diesel engines have been conducted using the investigation nozzles having the reduced number of holes (two- or three-hole nozzles) compared to the production nozzles. However, the similarity of spray dynamics between the investigation nozzles and production nozzles has not been confirmed yet. Also, the hole-number effect on spray dynamics has been investigated only in a limited range of hole number making it difficult to derive the clear trend and understandings of the hole number effect. In this study, the hole-number effect on spray dynamics of multi-hole diesel nozzles has been investigated in a wide range of hole number with sufficient data points (three, five, six, eight, nine-hole) by using the X-ray Phase-Contrast Imaging technique. The non-linear trend in the spray structure, as well as the dynamics results, was observed as increasing the hole number regardless of injection pressure. Discussions were made accordingly to understand the observed result trend. The study suggests that great attention is needed when deciding the number of nozzle holes for the optimized engine combustion.
KW - Multi-hole diesel nozzle
KW - Nozzle hole number
KW - Spray dynamics
KW - Spray spreading angle
KW - X-ray phase contrast imaging
UR - https://www.scopus.com/pages/publications/85058617663
U2 - 10.1016/j.expthermflusci.2018.12.022
DO - 10.1016/j.expthermflusci.2018.12.022
M3 - Article
AN - SCOPUS:85058617663
SN - 0894-1777
VL - 102
SP - 387
EP - 396
JO - Experimental Thermal and Fluid Science
JF - Experimental Thermal and Fluid Science
ER -