Modeling and simulation of non-ideal combustion
Abstract/Contents
- Abstract
- Non-ideal combustion can yield destructive processes such as thermoacoustic coupling and engine knock. These processes can be quite prevalent and pernicious in certain regimes and can depreciate the measurements of nominally ideal combustors such as shock tubes and rapid compression machines. These experimental devices are designed to isolate chemical kinetic phenomena from other complex processes that occur within the combustion chamber during engine operation such as spray breakup, fuel evaporation, and mixing. However, shock tube and rapid compression machine experiments can be susceptible non-ideal interaction of the gas dynamics with the ignition chemistry; for example, under certain test conditions in a shock tube experiment, a bifurcation structure may appear leading to the contamination of the test gas and a non-ideal ignition modality. Additionally, residual turbulence in a rapid compression machine may yield a deflagrative ignition event. These alternative ignition modalities obfuscate reaction-kinetic experiments and are best avoided. Hence, this dissertation will focus on studying the non-ideal combustion inherent in these configurations using an array of approaches: detailed simulation, low order modeling, and a data-driven methodology. It is found through detailed simulation that the chemical model sensitivities can yield a pronounced difference in the prediction of non-ideal combustion in shock tubes; furthermore, the effect of shock-boundary-layer interaction on ignition in shock tubes is found to be principally determined by the relative magnitude of the chemical and gas dynamic time scales. In rapid compression machines, it is argued through scaling analysis that temperature gradients produced during the compression stroke can significantly alter the character of the combustion. Finally, a data-driven analysis of irregular combustion in shock tubes, rapid compression machines, and detonations shows that disparate induction and heat release time scales strongly correlate to irregular combustion.
Description
| Type of resource | text |
|---|---|
| Form | electronic; electronic resource; remote |
| Extent | 1 online resource. |
| Publication date | 2017 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Associated with | Grogan, Kevin |
|---|---|
| Associated with | Stanford University, Department of Mechanical Engineering. |
| Primary advisor | Ihme, Matthias |
| Thesis advisor | Ihme, Matthias |
| Thesis advisor | Goldsborough, Scott |
| Thesis advisor | Lele, Sanjiva K. (Sanjiva Keshava), 1958- |
| Advisor | Goldsborough, Scott |
| Advisor | Lele, Sanjiva K. (Sanjiva Keshava), 1958- |
Subjects
| Genre | Theses |
|---|
Bibliographic information
| Statement of responsibility | Kevin Grogan. |
|---|---|
| Note | Submitted to the Department of Mechanical Engineering. |
| Thesis | Thesis (Ph.D.)--Stanford University, 2017. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2017 by Kevin Patrick Grogan
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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