Investigation of n-heptane ignition in shock tubes by endwall imaging, speciation, and temperature measurements
Abstract/Contents
- Abstract
- With the aim of increased energy efficiency and reduced pollutant emissions from internal combustion engines which burn petroleum and other liquid fuels, several modern alternative engine concepts, termed low-temperature combustion (LTC) engines, have recently been proposed. These engines have shown promising results with regard to increasing energy efficiency and reducing pollutant emissions, but have encountered challenges in controlling the timing of ignition and the rate of heat release. These difficulties have stemmed from an inherent reliance on the global chemical reaction rate of the fuel to determine the timing of these parameters in LTC engines. Current work to better understand the reaction rates of petroleum fuels at low temperatures is critical to the development of LTC engines. Some previous experimental work measuring the global reaction rates of petroleum fuels at low temperatures relevant to LTC engines exists in the literature. However, inconsistent or scattered results are often observed in the measured ignition delay times due to complications from impurities and non-ideal effects in the experimental reactors used. In the current work, a shock tube reactor was used to measure the rate of reaction of the primary reference fuel, \norm-heptane, at low temperatures. These measurements were largely free of the influence of particle impurities that have been found to influence the low-temperature combustion behavior of \norm-heptane. High-speed imaging and laser diagnostic measurements were performed to characterize under which conditions particle impurities were problematic, and to show when experiments were free of particle effects. Following the removal of particle impurity effects, species time-histories, ignition delay times, and temperature time-histories were measured during \norm-heptane combustion. Chemical reaction models which attempt to predict the global reaction rates for LTC fuels, often disagree with experimental measurements made at low temperatures and low pressures. These chemical models are under continuous development and require additional experimental measurements as validation targets for further improvement. The data provided here may serve as validation targets for future mechanism optimizations, and may lead to an improved ability to model LTC combustion, thereby aiding in the creation of LTC engines that are better able to control their ignition timing and heat release rate.
Description
| Type of resource | text |
|---|---|
| Form | electronic resource; remote; computer; online resource |
| Extent | 1 online resource. |
| Place | California |
| Place | [Stanford, California] |
| Publisher | [Stanford University] |
| Copyright date | 2018; ©2018 |
| Publication date | 2018; 2018 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Tulgestke, Andrew Michael |
|---|---|
| Degree supervisor | Hanson, Ronald |
| Thesis advisor | Hanson, Ronald |
| Thesis advisor | Bowman, Craig T. (Craig Thomas), 1939- |
| Thesis advisor | Davidson, David F. (David Francis), 1923- |
| Degree committee member | Bowman, Craig T. (Craig Thomas), 1939- |
| Degree committee member | Davidson, David F. (David Francis), 1923- |
| Associated with | Stanford University, Department of Mechanical Engineering. |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Andrew Michael Tulgestke. |
|---|---|
| Note | Submitted to the Department of Mechanical Engineering. |
| Thesis | Thesis Ph.D. Stanford University 2018. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2018 by Andrew Michael Tulgestke
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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