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Research Papers: Internal Combustion Engines

# Impact of Orifice Angle Configurations on the Droplet Atomization Enhancement of Diesel Fuel in a Group-Hole Nozzle

[+] Author and Article Information
Hyun Kyu Suh

Department of Mechanical Engineering, University of Connecticut, Storrs, CT 06269hksuh@engr.uconn.edu

Chang Sik Lee1

School of Mechanical Engineering, Hanyang Univeristy, 17 Haengdang-dong, Sungdong-gu, Seoul 133-791, Koreacslee@hanyang.ac.kr

1

Corresponding author.

J. Eng. Gas Turbines Power 133(11), 112802 (May 19, 2011) (7 pages) doi:10.1115/1.4002888 History: Received June 04, 2010; Revised September 18, 2010; Published May 19, 2011; Online May 19, 2011

## Abstract

This paper presents the effect of orifice configuration on the droplet atomization characteristics of diesel fuel injected through different types of group-hole nozzle angles, which are converged $(θ=−3 deg)$, parallel $(θ=0 deg)$, and diverged $(θ=+3 deg)$ orifices in atmospheric pressure and room temperature condition (0.1 MPa, 293 K). It was revealed that the parallel hole nozzle has the largest Sauter mean diameter (SMD) value and both sprays from diverged and converged hole nozzles show better atomization. A comparison of spray tip penetration illustrates that as the orifice angle is converged, spray tip penetration becomes longer, and it must be the reason for the fast spray velocity. These results can confirm the relationship among time, distance, and velocity. Therefore, it can be concluded that the droplet atomization enhancement can be expected in the converged nozzle spray rather than in the parallel and diverged nozzle sprays based on the results of smaller SMD, faster velocity, better air utilization, and higher percentage of small size of droplets in the measuring area.

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## Figures

Figure 1

Configurations of test nozzle orifice geometries

Figure 2

Effect of nozzle orifice angle on the local SMD distributions

Figure 3

Effect of nozzle orifice angle on the overall SMD and velocity droplet characteristics

Figure 4

Effect of orifice angle on the spray tip penetration

Figure 5

Effect of orifice angle on the spray arrival time and local mean velocity to the radial direction

Figure 6

Effect of nozzle orifice angle on the droplet velocity field

Figure 7

Effect of nozzle orifice angle on the droplet diameter (SMD) distributions

Figure 8

Variation percentage of droplet size and velocity distribution according to the nozzle orifice angle

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