Dissertation/Thesis Abstract

Parametric combustion modeling for ethanol-gasoline fuelled spark ignition engines
by Yeliana, Ph.D., Michigan Technological University, 2010, 217; 3439138
Abstract (Summary)

Ethanol-gasoline fuel blends are increasingly being used in spark ignition (SI) engines due to continued growth in renewable fuels as part of a growing renewable portfolio standard (RPS) [1]. This leads to the need for a simple and accurate ethanol-gasoline blends combustion model that is applicable to one-dimensional engine simulation.

A parametric combustion model has been developed, integrated into an engine simulation tool, and validated using SI engine experimental data. The parametric combustion model was built inside a user compound in GT-Power. In this model, selected burn durations were computed using correlations as functions of physically based non-dimensional groups that have been developed using the experimental engine database over a wide range of ethanol-gasoline blends, engine geometries, and operating conditions. A coefficient of variance (COV) of gross indicated mean effective pressure (IMEP) correlation was also added to the parametric combustion model. This correlation enables the cycle combustion variation modeling as a function of engine geometry and operating conditions. The computed burn durations were then used to fit single and double Wiebe functions. The single-Wiebe parametric combustion compound used the least squares method to compute the single-Wiebe parameters, while the double-Wiebe parametric combustion compound used an analytical solution to compute the double-Wiebe parameters. These compounds were then integrated into the engine model in GT-Power through the multi-Wiebe combustion template in which the values of Wiebe parameters (single-Wiebe or double-Wiebe) were sensed via RLT-dependence.

The parametric combustion models were validated by overlaying the simulated pressure trace from GT-Power on to experimentally measured pressure traces. A thermodynamic engine model was also developed to study the effect of fuel blends, engine geometries and operating conditions on both the burn durations and COV of gross IMEP simulation results.

Indexing (document details)
Advisor: Naber, Jeffrey D.
Commitee: Lee, Seong-Young, Michalek, Donna, Tanner, Franz
School: Michigan Technological University
Department: Mechanical Engineering-Engineering Mechanics
School Location: United States -- Michigan
Source: DAI-B 72/03, Dissertation Abstracts International
Subjects: Automotive engineering, Mechanical engineering
Keywords: Combustion, Cycle combution variation, Ethanol blends, Spark ignition engines, Thermodynamic engine model, Wiebe function
Publication Number: 3439138
ISBN: 978-1-124-43809-2
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