Research Papers: Internal Combustion Engines

Validating the Phenomenological Smoke Model at Different Operating Conditions of DI Diesel Engines

[+] Author and Article Information
Y. V. Aghav, A. D. Dani

 Kirloskar Oil Engines Limited, Pune, 411 003 India

P. A. Lakshminarayanan, Azeem Uddin

 Ashok Leyland Ltd., Hosur, Tamilnadu, 635 126 India

M. K. Babu

 Indian Institute of Technology, Delhi, 110 016 India

J. Eng. Gas Turbines Power 130(1), 012803 (Jan 09, 2008) (8 pages) doi:10.1115/1.2771239 History: Received June 04, 2006; Revised April 28, 2007; Published January 09, 2008

A new phenomenological model that was published in Aghav (2005, “Phenomenology of Smoke From Direct Injection Diesel Engines,  ” Proceedings of ICEF2005, ASME Paper No. 1350) encompasses the spray and the wall interaction by a simple geometrical consideration. The current study extends this earlier work with investigations made on 16 different engines from six-engine families of widely varying features, applied to off-highway as well as on-road duty. A dimensionless factor was introduced to take care of the nozzle hole manufactured by hydroerosion, as well as the conical shape of the nozzle hole (k factor) in the case of valve-closed-orifice type of nozzles. The smoke emitted from the wall spray formed after wall impingement is the major contributor to the total smoke at higher loads. As the fuel spray impinges upon the walls of the combustion chamber, its velocity decreases. This low-velocity jet contributes to the higher rate of the smoke production. Therefore, the combustion bowl geometry along with injection parameters play a significant role in the smoke emissions. The new model is one dimensional and based on the recent phenomenological description of spray combustion in a direct injection diesel engine. The satisfactory comparison of the predicted and observed smoke over the wide range of engine operation demonstrated applicability of the model in simulation study of combustion occurring in direct injection (DI) diesel engines.

Copyright © 2008 by American Society of Mechanical Engineers
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Figure 2

Free jet fuel spray and subsequent wall jet under engine conditions

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Figure 3

Experimental set up and instrumentation

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Figure 4

Combustion chambers

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Figure 5

Experimentally observed smoke along full throttle for different engines

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Figure 6

Experimentally observed smoke along part loads at different speeds for engine L

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Figure 7

Degree of impingement and observed smoke

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Figure 8

Predicted and observed smoke, full throttle of engines I, J, and F

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Figure 9

Predicted and observed smoke, full throttle of engines L, M, N, and O

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Figure 10

Comparison of predicted and observed smoke at full load of engines I, J, F, L, M, N, and O

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Figure 12

Comparison of predicted and observed smoke for various engines at part loads at rated speed

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Figure 13

Predicted observed smoke for all engines in Table 1

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Figure 14

Comparison of present model with AVL BOOST model texperimental data

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Figure 15

Explanation of KF and HE nozzles

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Figure 1

Conceptual cross section of turbulent flame indicating the soot path

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Figure 11

Predicted and observed smoke, part loads of engines C, E, D, and K at constant speed



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