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Ethanol Autoignition Modeling And Validation At Wide Ranges Of Mixture Temperatures, Pressures, And Equivalence Ratios, Antowan Zyada

Wayne State University Dissertations

A new ethanol detailed kinetic model with 107 species and 1795 reactions was developed by using the reaction mechanism generator (RMG) and a thorough reaction path analysis. The mechanism model was extensively evaluated against measured ignition delay times, laminar flame speeds, and time-resolved species concentrations. The ignition delay experiments were conducted at pressures of 15, 20, and 30 bar, a temperature range of 850 to 1000 K, and equivalence ratios of 0.5, 1.0 and 2.0 using an optically accessible rapid compression machine (RCM). The effect of oxygen concentration on the ignition delay at a fixed equivalence ratio was also measured …

Ionization In Diesel Combustion: Mechanism, New Instrumentation And Engine Applications, Fadi Estefanous

Wayne State University Dissertations

Diesel engines are known for their superior fuel economy and high power density. However they emit undesirable high levels of nitrogen oxide (NOx) and black particulate smoke (Soot). To reduce these emissions, close loop engine control strategies are required. Therefore, there is a need for an in-cylinder combustion sensor. The ion current sensor has been used for combustion sensing in gasoline engines for which ionization mechanisms have been developed. This is not the case in diesel engines.

In this dissertation, a new mechanism for ionization in diesel engines has been developed and experimentally validated. Moreover, a three dimensional model has …