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Research Papers: Gas Turbines: Combustion, Fuels, and Emissions

Thermodynamics-Based Mean Value Model for Diesel Combustion

[+] Author and Article Information
Byungchan Lee

e-mail: garam@umd.umich.edu

Dohoy Jung

e-mail: dohoy@umd.umich.edu
Department of Mechanical Engineering,
University of Michigan-Dearborn,
Dearborn, MI 48128

Yong-Wha Kim

e-mail: ykim9@ford.com

Michiel van Nieuwstadt

e-mail: Mvannie1@ford.com
Powertrain Controls R&A,
Ford Motor Company,
Dearborn, MI 48121

Contributed by the Combustion and Fuels Committee of ASME for publication in the Journal of Engineering for Gas Turbines and Power. Manuscript received April 1, 2013; final manuscript received May 15, 2013; published online July 31, 2013. Editor: David Wisler.

J. Eng. Gas Turbines Power 135(9), 091504 (Jul 31, 2013) (9 pages) Paper No: GTP-13-1092; doi: 10.1115/1.4024757 History: Received April 01, 2013; Revised May 15, 2013

A thermodynamics-based computationally efficient mean value engine model that computes ignition delay, combustion phases, exhaust temperature, and indicated mean effective pressure has been developed for the use of control strategy development. The model is derived from the thermodynamic principles of ideal gas standard limited pressure cycle. In order to improve the fidelity of the model, assumptions that are typically used to idealize the cycle are modified or replaced with ones that more realistically replicate the physical process such as exhaust valve timing, in-cylinder heat transfer, and the combustion characteristics that change under varying engine operating conditions. The model is calibrated and validated with the test data from a Ford 6.7 liter diesel engine. The mean value model developed in this study is a flexible simulation tool that provides excellent computational efficiency without sacrificing critical details of the underlying physics of the diesel combustion process.

Copyright © 2013 by ASME
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Figures

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Fig. 1

Rate of heat release and fuel injection

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Fig. 2

The p-V and T-S diagrams of the ideal gas standard limited pressure cycle

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Fig. 3

The p-V diagram of the ideal gas standard limited pressure cycle

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Fig. 4

Method used to measure xcv from the test data

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Fig. 5

The α, β, Te, and imepig as functions of xcv

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Fig. 6

Ignition delay correlation

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Fig. 7

Exhaust valve opening before BDC

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Fig. 8

The p-V diagram of the ideal gas standard limited pressure cycle with intake and exhaust processes

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Fig. 9

Measured exhaust mass flow rate and gas temperature inside the cylinder and at the exhaust port, compared with the gas temperature in the cylinder computed by the ideal cycle model

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Fig. 10

Engine operating conditions for the test data

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Fig. 12

Constant volume burn ratio

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Fig. 13

Indicated mean effective pressure

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Fig. 14

Engine operating conditions for the model validation

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Fig. 15

Indicated mean effective pressure

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Fig. 16

Exhaust gas temperature

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Fig. 17

Peak cylinder pressure

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