Hole Geometrical Effect on Internal Flow, Fuel Atomization and Spray Evaporation of Multi-Hole Nozzle for Diesel Engine

2017 ◽  
Author(s):  
PengBo Dong ◽  
Jun Yamauchi ◽  
Keiya Nishida ◽  
Youichi Ogata
Keyword(s):  
Diesel Engine ◽  
Internal Flow ◽  
Fuel Atomization ◽  
Geometrical Effect

scholarly journals Effect of Fuel Mass Flow at the End of Injection on Cavitation and Gas Ingestion in the Nozzle

2020 ◽  
Vol 11 (1) ◽  
pp. 258
Author(s):  
Hua Wen ◽  
Yulong Jiang ◽  
Jinglong Ma
Keyword(s):  
Diesel Engine ◽  
High Speed ◽  
Internal Flow ◽  
Two Phase ◽  
Fuel Mass ◽  
Experimental Platform ◽  
Fuel Atomization ◽  
Fuel Flow ◽  
Mass Flows ◽  
Framing Camera

The fuel flow in the diesel engine nozzle has a vital impact on the fuel atomization and spray, and the fuel mass flux affects the internal flow of the nozzle. The visual experimental platform for a transparent nozzle was built to obtain the image of fuel flow in a nozzle with a small sac combining the back-light imaging technology and a high-speed framing camera. A two-phase three-component numerical model, based on the OpenFOAM solver, was calculated to quantitatively analyze gas ingestion and cavitation in the nozzle. The results indicate that at the end of injection (EOI), fuel cavitation and external air backflow (gas ingestion) occur successively in the nozzle, and both phenomena first appear in the orifice and then transition to the sac. Cavitation collapse is the major factor of gas ingestion, and the total amount of gas ingestion and cavitation mainly depends on the sac. The outflow of fuel largely depends on the total amount of cavitation and the inertial outflow of fuel at the EOI. The type of cavitation in the nozzle mainly presents annular and bulk cavitation, the former primarily exists in the sac, while the latter is established within the orifice. Therefore, larger mass flows will contribute to stronger cavitation and gas ingestion.

Effect of Hardness of Needle-Sealing Surface of Pintle Nozzle on Cavitation Erosion

2011 ◽  
Vol 130-134 ◽  
pp. 946-949
Author(s):  
Heng Zhou Wo ◽  
Ya Fang Zhang ◽  
Xian Guo Hu ◽  
Yu Fu Xu
Keyword(s):  
Diesel Engine ◽  
Cavitation Erosion ◽  
Surface Hardness ◽  
Lower Surface ◽  
Important Influence ◽  
The Other ◽  
Power Performance ◽  
Fuel Atomization ◽  
Heat Treated

Nozzle is one of key parts in the diesel engine. The cavitation erosion of needle-sealing surface in the pintle nozzle has important influence on the fuel atomization, combustion and power performance of diesel engine. In order to investigate the effect of hardness of needle-sealing surface on cavitation erosion, two kinds of nozzles were selected and operated in S195 diesel engine for 10 hours. One nozzle is heat-treated one which has lower surface hardness; the other with higher surface hardness is real commercial nozzle. The surface appearances of original and operated nozzle-sealing surface were observed by SEM. It was found that the cavitation erosion on the seal surface of nozzle with lower hardness was severer than that of nozzle with higher hardness. However, their wear ways and formations are similar.

1305 Internal Flow of Nozzles for Large Marine Diesel Engine and Spray Characteristics on Individual Holes

2016 ◽  
Vol 2016.54 (0) ◽  
pp. _1305-1_-_1305-2_
Author(s):  
Kousuke NAKAMURA ◽  
Kouki ISHIDA ◽  
Syuhei SUGATA ◽  
Daiki IUCHI ◽  
Sumito YOKOBE ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Internal Flow ◽  
Marine Diesel Engine ◽  
Spray Characteristics ◽  
Marine Diesel

NUMERICAL ANALYSIS OF THE INFLUENCE OF DIESEL NOZZLE DESIGN ON INTERNAL FLOW CHARACTERISTICS FOR 2-VALVE DIESEL ENGINE APPLICATION

2013 ◽  
Vol 23 (2) ◽  
pp. 97-118 ◽  
Author(s):  
Joaquin De la Morena ◽  
Kshitij Neroorkar ◽  
Alejandro H. Plazas ◽  
Richard C. Peterson ◽  
David P. Schmidt
Keyword(s):  
Diesel Engine ◽  
Numerical Analysis ◽  
Flow Characteristics ◽  
Internal Flow ◽  
Nozzle Design ◽  
Diesel Nozzle

Numerical Simulation on Effect of Nozzle-Hole Layout on Spray Characteristics and Combustion in a DI Diesel Engine

2012 ◽  
Vol 476-478 ◽  
pp. 448-452
Author(s):  
Jun Zhang ◽  
Chang Pu Zhao ◽  
Nai Zhuan Chen ◽  
Da Lu Dong ◽  
Bo Zhong
Keyword(s):  
Numerical Simulation ◽  
Diesel Engine ◽  
Direct Injection ◽  
Combustion Process ◽  
Three Dimensional ◽  
Three Dimensional Model ◽  
Spray Characteristics ◽  
Fuel Atomization ◽  
Di Diesel Engine ◽  
Nozzle Hole

Diesel spray characteristics are closely related to the combustion of the engine where the spray tip penetration and the fuel atomization play a key role especially for direct injection (DI) diesel engine. With different nozzles, the fuel atomization and evaporation will be different thereby affecting the combustion and emission characteristics. A three-dimensional model is built based on the parameters of a DI diesel engine, and its validation is also validated. Three nozzle-hole layouts are designed in this research, including the conventional hole, multi-hole, and group-hole. The spray characteristics and combustion process are studied with three different nozzle-hole layouts by the way of numerical simulation. Further more, the effect of inter-hole spacing of group-hole nozzle on the evaporation rate and combustion process is researched here.

scholarly journals Fractal diagnostics of the degree of fuel atomization by diesel engine injectors

2017 ◽  
Vol 6 (8 (90)) ◽  
pp. 40-46 ◽  
Author(s):  
Serhii Pustiulha ◽  
Viktor Samostian ◽  
Nataliya Tolstushko ◽  
Serhiy Korobka ◽  
Mykhailo Babych
Keyword(s):  
Diesel Engine ◽  
Fuel Atomization
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