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Title: Prechamber equipped laser ignition for improved performance in natural gas engines

Lean-burn operation of stationary natural gas engines offers lower NO x emissions and improved efficiency. A proven pathway to extend lean-burn operation has been to use laser ignition instead of standard spark ignition. However, under lean conditions, flame speed reduces thereby offsetting any efficiency gains resulting from the higher ratio of specific heats, γ. The reduced flame speeds, in turn, can be compensated with the use of a prechamber to result in volumetric ignition, and thereby lead to faster combustion. In this study, the optimal geometry of PCLI was identified through several tests in a single-cylinder engine as a compromise between autoignition, NO x and soot formation within the prechamber. Subsequently, tests were conducted in a single-cylinder natural gas engine comparing the performance of three ignition systems: standard electrical spark ignition (SI), single-point laser ignition (LI), and prechamber equipped laser ignition (PCLI). Out of the three, the performance of PCLI was far superior compared to the other two. Efficiency gain of 2.1% points could be achieved while complying with EPA regulation (BSNO x < 1.34 kW-hr) and the industry standard for ignition stability (COV_IMEP < 5%). Finally, test results and data analysis are presented identifying the combustion mechanisms leading tomore » the improved performance.« less
Authors:
; ; ; ; ;
Publication Date:
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Journal of Engineering for Gas Turbines and Power
Additional Journal Information:
Journal Volume: 139; Journal Issue: 10; Journal ID: ISSN 0742-4795
Publisher:
ASME
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Advanced Manufacturing Office (EE-5A)
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; Cogeneration; Gas engine; Laser ignition; Natural gas; Unscavenged prechamber
OSTI Identifier:
1371484

Almansour, Bader, Vasu, Subith, Gupta, Sreenath B., Wang, Qing, Van Leeuwen, Robert, and Ghosh, Chuni. Prechamber equipped laser ignition for improved performance in natural gas engines. United States: N. p., Web. doi:10.1115/1.4036291.
Almansour, Bader, Vasu, Subith, Gupta, Sreenath B., Wang, Qing, Van Leeuwen, Robert, & Ghosh, Chuni. Prechamber equipped laser ignition for improved performance in natural gas engines. United States. doi:10.1115/1.4036291.
Almansour, Bader, Vasu, Subith, Gupta, Sreenath B., Wang, Qing, Van Leeuwen, Robert, and Ghosh, Chuni. 2017. "Prechamber equipped laser ignition for improved performance in natural gas engines". United States. doi:10.1115/1.4036291. https://www.osti.gov/servlets/purl/1371484.
@article{osti_1371484,
title = {Prechamber equipped laser ignition for improved performance in natural gas engines},
author = {Almansour, Bader and Vasu, Subith and Gupta, Sreenath B. and Wang, Qing and Van Leeuwen, Robert and Ghosh, Chuni},
abstractNote = {Lean-burn operation of stationary natural gas engines offers lower NOx emissions and improved efficiency. A proven pathway to extend lean-burn operation has been to use laser ignition instead of standard spark ignition. However, under lean conditions, flame speed reduces thereby offsetting any efficiency gains resulting from the higher ratio of specific heats, γ. The reduced flame speeds, in turn, can be compensated with the use of a prechamber to result in volumetric ignition, and thereby lead to faster combustion. In this study, the optimal geometry of PCLI was identified through several tests in a single-cylinder engine as a compromise between autoignition, NOx and soot formation within the prechamber. Subsequently, tests were conducted in a single-cylinder natural gas engine comparing the performance of three ignition systems: standard electrical spark ignition (SI), single-point laser ignition (LI), and prechamber equipped laser ignition (PCLI). Out of the three, the performance of PCLI was far superior compared to the other two. Efficiency gain of 2.1% points could be achieved while complying with EPA regulation (BSNOx < 1.34 kW-hr) and the industry standard for ignition stability (COV_IMEP < 5%). Finally, test results and data analysis are presented identifying the combustion mechanisms leading to the improved performance.},
doi = {10.1115/1.4036291},
journal = {Journal of Engineering for Gas Turbines and Power},
number = 10,
volume = 139,
place = {United States},
year = {2017},
month = {4}
}