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TECHNICAL PAPERS: Internal Combustion Engines

Injection Pressure Fluctuations Model Applied to a Multidimensional Code for Diesel Engines Simulation

[+] Author and Article Information
Stefano Ubertini

 University of Rome “Tor Vergata,” Via del Politecnico, 1, 00133 Roma, Italyubertini@mail.mec.uniroma2.it

J. Eng. Gas Turbines Power 128(3), 694-701 (Sep 23, 2005) (8 pages) doi:10.1115/1.2135813 History: Received November 24, 2004; Revised September 23, 2005

This paper deals with the pressure supply fluctuations that occur in the fuel rail and in the injector on the immediate upstream side of the atomizer. It has been experimentally demonstrated that this has a considerable effect on the instantaneous mass flow and spray velocity thus affecting the spray hard-core structure and the atomization process. Moreover, considering the oscillatory nature of the phenomenon, the effects on a given spray can change from one injection to the other (in modern multijet systems) and from one engine cycle to the next. The needed computing time and the uncertainty related to a detailed simulation of the injection system fluid dynamics would be unacceptable in a multidimensional computational code. Therefore a simplified model able to predict fuel pressure supply fluctuations on the upstream side of the injector has been developed and is described in this paper. The model is validated and calibrated by comparing numerical results with available experimental data. Some numerical results on a fuel spray injected into a vessel at constant pressure are finally presented, in order to quantify the impact of a given level of pressure fluctuations on fuel spray characteristics.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

Simplified geometrical scheme of the high-pressure circuit of the injection system

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Figure 2

Comparison between numerical results and injection pressure measurements

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Figure 3

Injection pressure fluctuations with different values of kw

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Figure 4

Injection pressure fluctuations with different values of ka

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Figure 5

Injection pressure fluctuations with different values of kb

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Figure 6

Injection pressure fluctuations with different injection duration

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Figure 7

Supply pressure fluctuations effect on fuel spray penetration

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Figure 8

Supply pressure fluctuations effect on injected mass

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Figure 9

Supply pressure fluctuations effects on fuel spray penetration with a five-strike strategy

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Figure 10

Supply pressure fluctuations effects on injected mass with a five-strike strategy

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Figure 11

Supply pressure fluctuations effects on the fuel spray structure with a five-strike strategy

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