Thermally Stratified Compression Ignition: A new advanced low temperature combustion mode with load flexibility
Abstract
We introduce a new advanced combustion mode, called Thermally Stratified Compression Ignition (TSCI), which uses direct water injection to control both the average temperature and the temperature distribution prior to ignition, thereby providing cycle-to-cycle control over the start and rate of heat release in Low Temperature Combustion (LTC). Experiments were conducted to fundamentally understand the effects of water injection on heat release in LTC. Our results show that water injection retards the start of combustion due to the latent heat of vaporization of the injected water. Furthermore, for start of water injection timings between 20 and 70 degrees before top dead center, combustion is significantly elongated compared to without water injection. The 10–90% burn duration with 6.6 and 9.0 mg of water per cycle was 77% and 146% longer than without water injection, respectively. Forced thermal stratification result from a direct water injection which reduces the heat release rate by local evaporative cooling. Finally, the load limits with and without water injection were determined experimentally. Without water injection, the load range was 2.3–3.6 bar gross IMEP. By using water injection to control heat release, the load range in TSCI was 2.3–8.4 bar gross IMEP, which is a range expansion ofmore »
- Authors:
-
- Stony Brook Univ., NY (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Fuels, Engines and Emissions Research Center (FEERC); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). National Transportation Research Center (NTRC)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1342679
- Alternate Identifier(s):
- OSTI ID: 1413332
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Applied Energy
- Additional Journal Information:
- Journal Volume: 189; Journal Issue: C; Journal ID: ISSN 0306-2619
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; 42 ENGINEERING; 20 FOSSIL-FUELED POWER PLANTS; Low temperature combustion; Advanced combustion; HCCI; Heat release; Thermal stratification
Citation Formats
Lawler, Benjamin, Splitter, Derek, Szybist, James, and Kaul, Brian. Thermally Stratified Compression Ignition: A new advanced low temperature combustion mode with load flexibility. United States: N. p., 2017.
Web. doi:10.1016/j.apenergy.2016.11.034.
Lawler, Benjamin, Splitter, Derek, Szybist, James, & Kaul, Brian. Thermally Stratified Compression Ignition: A new advanced low temperature combustion mode with load flexibility. United States. https://doi.org/10.1016/j.apenergy.2016.11.034
Lawler, Benjamin, Splitter, Derek, Szybist, James, and Kaul, Brian. Wed .
"Thermally Stratified Compression Ignition: A new advanced low temperature combustion mode with load flexibility". United States. https://doi.org/10.1016/j.apenergy.2016.11.034. https://www.osti.gov/servlets/purl/1342679.
@article{osti_1342679,
title = {Thermally Stratified Compression Ignition: A new advanced low temperature combustion mode with load flexibility},
author = {Lawler, Benjamin and Splitter, Derek and Szybist, James and Kaul, Brian},
abstractNote = {We introduce a new advanced combustion mode, called Thermally Stratified Compression Ignition (TSCI), which uses direct water injection to control both the average temperature and the temperature distribution prior to ignition, thereby providing cycle-to-cycle control over the start and rate of heat release in Low Temperature Combustion (LTC). Experiments were conducted to fundamentally understand the effects of water injection on heat release in LTC. Our results show that water injection retards the start of combustion due to the latent heat of vaporization of the injected water. Furthermore, for start of water injection timings between 20 and 70 degrees before top dead center, combustion is significantly elongated compared to without water injection. The 10–90% burn duration with 6.6 and 9.0 mg of water per cycle was 77% and 146% longer than without water injection, respectively. Forced thermal stratification result from a direct water injection which reduces the heat release rate by local evaporative cooling. Finally, the load limits with and without water injection were determined experimentally. Without water injection, the load range was 2.3–3.6 bar gross IMEP. By using water injection to control heat release, the load range in TSCI was 2.3–8.4 bar gross IMEP, which is a range expansion of over 350%. These results demonstrate that direct water injection can provide significant improvements to both controllability and the range of operability of LTC, thereby resolving the major challenges associated with HCCI.},
doi = {10.1016/j.apenergy.2016.11.034},
journal = {Applied Energy},
number = C,
volume = 189,
place = {United States},
year = {Wed Mar 01 00:00:00 EST 2017},
month = {Wed Mar 01 00:00:00 EST 2017}
}
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