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3D CFD MODELING AND VALIDATION OF ION CURRENT SENSOR IN A GEN-SET DIESEL ENGINE USING CHEMICAL KINETIC MECHANISM

[+] Author and Article Information
Tamer Badawy

ASME Member Wayne State University 5050 Anthony Wayne Dr. Suite 2100 Detroit, MI, USA 48202
eng.tam@gmail.com

Naeim Henein

Wayne State University 5050 Anthony Wayne Dr. Suite 2100 Detroit, MI, USA 48202
henein@eng.wayne.edu

1Corresponding author.

ASME doi:10.1115/1.4036494 History: Received November 20, 2016; Revised March 14, 2017

Abstract

Ion current sensing is a low-cost technology that can provide a real-time feedback for the in-cylinder combustion process. The ion current signal depends on several design parameters of the sensing probe in addition to the operating conditions of the engine. To experimentally determine the effect of each of these parameters on the ion current signal, it requires modifications in the engine which would be costly and time consuming. A 3D computational fluid dynamics (CFD) model, coupled with a chemical kinetic solver, was developed to calculate the mole fraction of the ionized species formed in different zones in the fuel spray. A new approach of defining a number of virtual ion sensing probes was introduced to the model to determine the influence of sensor design and location relative to the spray axis on the signal characteristics. The contribution of the premixed and the mixing-diffusion controlled combustion was investigated. In addition, the crank angle resolved evolution of key ionization species produced during the combustion process was also compared at different engine operating conditions.

Copyright (c) 2017 by ASME
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