Exploring the pathway to high-efficiency, high-power IC engines through exergy analysis and stoichiometric direct injection
Abstract/Contents
- Abstract
- New technologies are needed to improve engine efficiencies in road-freight applications, without sacrificing power output. Heat transfer losses are one of the largest sources of inefficiency in these internal-combustion engines. Mitigating these losses creates the opportunity for substantial efficiency gains. Additionally, reduced heat transfer can allow for high-temperature combustion, which enables the use of low-cetane fuels—as well as non-petroleum-based alternative fuels—in direct-injected operation. Using these fuels can simplify the exhaust aftertreatment system. First, modeling is used to explore possible strategies for reducing heat transfer. Engine insulation, along with mechanical regeneration that utilizes increased exhaust exergy, can increase engine exergy efficiency beyond 50%. Next, experiments are performed to determine the feasibility of using alcohol direct injection to phase and control combustion in an insulated engine. Even at stoichiometric operation, engine-out soot emissions are below the 2010 EPA standard without aftertreatment. More experiments are conducted to evaluate the performance of an insulated, direct-injected, mechanically-regenerated engine. Turbocharging increases LHV efficiency to nearly 43%, and load to almost 30 bar IMEP. Turbo-compounding is shown to make modest additional gains. Finally, exhaust retention is used to reduce load by 50%—while remaining stoichiometric—at little loss of efficiency.
Description
| Type of resource | text |
|---|---|
| Form | electronic; electronic resource; remote |
| Extent | 1 online resource. |
| Publication date | 2015 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Associated with | Johnson, Bernard Henry IV |
|---|---|
| Associated with | Stanford University, Department of Mechanical Engineering. |
| Primary advisor | Edwards, C. F. (Christopher Francis) |
| Thesis advisor | Edwards, C. F. (Christopher Francis) |
| Thesis advisor | Bowman, Craig T. (Craig Thomas), 1939- |
| Thesis advisor | Mitchell, Reginald |
| Advisor | Bowman, Craig T. (Craig Thomas), 1939- |
| Advisor | Mitchell, Reginald |
Subjects
| Genre | Theses |
|---|
Bibliographic information
| Statement of responsibility | Bernard Henry Johnson IV. |
|---|---|
| Note | Submitted to the Department of Mechanical Engineering. |
| Thesis | Thesis (Ph.D.)--Stanford University, 2015. |
| Location | electronic resource |
Access conditions
- Copyright
- © 2015 by Bernard Henry Johnson
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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