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The Effect of Non-Circular Nozzle Holes on Combustion and Emission Formation in a Heavy Duty Diesel Engine
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 21, 2002 by SAE International in United States
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Non-circular holes are believed to have a potential in reducing the smoke emissions from a diesel engine by entraining more air into the spray due to the larger surface area exposed between fuel and air. The idea is based on results from investigations of gas jets, where the air entrainment for elliptical jets was increased substantially compared to circular jets. Non-circular nozzle holes were tested in a 2 liter single cylinder heavy duty diesel engine and compared with standard circular nozzle holes. The non-circular holes, which were made with aspect ratios of close to 2:1 and 4:1, have a similar flow rate as the conventional circular holes. Two different angles of the major axis orientation to the injector centerline were used. The engine tests were done at constant speed with both high and low load conditions and were repeated several times. Emissions, fuel consumption and cylinder pressure were measured and are presented together with calculated rate of heat release curves. The results show that the non-circular nozzle holes have a tendency to extend combustion, and the tendency is stronger for the higher aspect ratio. For the aspect ratio of 2:1, the differences in emissions and fuel consumption are small compared with the standard circular shaped nozzle. In the rate of heat release curves for aspect ratio 2:1 it is seen that the delayed combustion is likely caused by spray wall interactions. It is concluded that the hole shape, like those used with the aspect ratio 2:1 nozzles, has a minor impact on the diesel combustion at the tested conditions. The combustion from the aspect ratio 4:1 nozzles which is delayed even further is believed to be caused by spray-wall interactions, but trade off curves for emissions and fuel consumption are similar to those off standard circular nozzles.
CitationMatsson, A. and Andersson, S., "The Effect of Non-Circular Nozzle Holes on Combustion and Emission Formation in a Heavy Duty Diesel Engine," SAE Technical Paper 2002-01-2671, 2002, https://doi.org/10.4271/2002-01-2671.
SAE 2002 Transactions Journal of Fuels and Lubricants
Number: V111-4; Published: 2003-09-15
Number: V111-4; Published: 2003-09-15
- Ho, C. Gutmark, E. “Vortex induction and mass entrainment in a small-aspect-ratio elliptic jet” J.Fluid Mech. 208 382 405 1987
- Hussain, F. Husain, H.S. “Elliptic jets. Part 1, Characteristics of unexcited and excited jets” Fluid Mech. 208 257 320 1989
- Xi, D.G. Yang, Y.X. Zhang, J.B. Shi, S.X. “Experimental study on spray from nozzles of elliptic orifice” AMD-Vol.151/PVP-Vol.247, Symposium on Flow-Induced Vibration and Noise ASME 7 1992
- Yamamoto, H. Niimura, K. “Characteristics of Fuel Sprays from Specially Shaped and Impinging Flow Nozzels” SAE Paper 950082
- Gong, Y. Changwen, L. Yezhou, H. Zhijun, P. “An Experimental Study on Droplet Size Characteristics and Air Entrainment of Elliptic Sprays” SAE Paper 982546
- Jacobsson, L. Chomiak J. “Injection Orifice Shape: Effects on Combustion and Emission Formation in Diesel Engines” Transactions of the SAE 106 1479 1496 SAE Paper 972964 1997
- Jacobsson, L. Winklhofer, E. Chomiak J. “Injection Orifice Shape: Effects on Spray Characteristics and Heat-Release Rate in a Large-Size Single-Cylinder Diesel Engine” SAE Paper 1999-01-34
- Matsson, A. Jacobsson, L. Andersson, S. “The Effect of Elliptical Nozzle Holes on Combustion and Emission Formation in a Heavy Duty Diesel Engine” SAE paper 2000-01-1251 2000
- Matsson, A. “The effect of nozzle inlet conditions on fuel consumption and emissions of a heavy duty diesel engine” JSAE paper 20015345