Shock tube studies of kinetics of conventional and alternative engine fuels
Abstract/Contents
- Abstract
- Experiments were performed using shock tube and laser absorption methods to investigate the oxidation and pyrolysis systems of conventional and alternative fuels, and fuel components, under engine-relevant conditions. Ignition delays were measured during fuel oxidation and several stable intermediates were measured during fuel pyrolysis. Ignition delay times were measured in the gas-phase for several engine fuels in various oxidizers behind reflected shock waves in a heated high-pressure shock tube. Initial reflected shock conditions were as follows: temperatures of 1000 - 1500 K, pressures of 2 - 60 atm, equivalence ratios of 0.2 - 2, and oxygen concentrations of 4% and 21% with argon and 21% in synthetic air. Ignition delay times were measured using sidewall pressure, OH* emission at 306 nm as well as 3.39 µm mid-infrared He-Ne laser absorbance. The new experimental results were modeled using several kinetic mechanisms with the most current jet fuel surrogate mixtures as well as with a new hybrid model currently in development at Stanford. Measurements of stable decomposition products of engine fuel pyrolysis were performed behind reflected shock waves at temperatures from 1100 to 1600 K and pressure of 12 atm for all engine fuels tested. Species time-history measurements of ethylene and methane were made in pyrolysis experiments using laser absorption. Similar product yields were found for conventional fuels but not for alternative fuels at current conditions. These data provide needed input for the development and validation of a new compact hybrid kinetic model under development at Stanford. A traditional jet fuel chemical kinetics model using surrogate fuel compounds and combined detailed mechanisms of these surrogates was also discussed and compared with the hybrid model. The performance of the hybrid model appears better than that of the surrogate model, but still needs improvement. Finally, we applied a new driven-gas loading method that constrains the volume of reactive gases, thereby producing near-constant-pressure test conditions for reflected shock measurements. The near-constant-pressure ignition delay times provide a new database for low-temperature 1-butanol mechanism development independent of non-idealities caused by either shock attenuation or pre-ignition perturbations. Comparisons of these near-constant-pressure measurements with predictions using several reaction mechanisms available in the literature were performed. All current studies of kinetics of conventional engine fuels, engine fuel component (decalin), alternative engine fuels, and alternative fuel component (butanol) provide useful kinetic targets for the development, validation, and refinement of combustion kinetics models, and provide valuable insights on the pre-ignition phenomenon typically observed in shock tube ignition delay experiments.
Description
| Type of resource | text |
|---|---|
| Form | electronic; electronic resource; remote |
| Extent | 1 online resource. |
| Publication date | 2016 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Associated with | Zhu, Yangye |
|---|---|
| Associated with | Stanford University, Department of Mechanical Engineering. |
| Primary advisor | Hanson, Ronald |
| Thesis advisor | Hanson, Ronald |
| Thesis advisor | Bowman, Craig T. (Craig Thomas), 1939- |
| Thesis advisor | Wang, Hai, 1962- |
| Advisor | Bowman, Craig T. (Craig Thomas), 1939- |
| Advisor | Wang, Hai, 1962- |
Subjects
| Genre | Theses |
|---|
Bibliographic information
| Statement of responsibility | Yangye Zhu. |
|---|---|
| Note | Submitted to the Department of Mechanical Engineering. |
| Thesis | Thesis (Ph.D.)--Stanford University, 2016. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2016 by Yangye Zhu
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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