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Title: | Finding a common ground for RCM experiments. Part B : benchmark study on ethanol ignition | Authors: | Büttgen, RD Preußker, M Kang, K Cheng, S Goldsborough, SS Issayev, G Farooq, A Song, H Fenard, Y Vanhove, G El-Sabor Mohamed, AA Curran, HJ Heufer, KA |
Issue Date: | Apr-2024 | Source: | Combustion and flame, Apr. 2024, v. 262, 113338 | Abstract: | Rapid compression machines (RCMs) are widely used to investigate gas phase reaction kinetics of various kind of fuels at application relevant conditions. In principle, the operation of an RCM is based on the idea of compressing a homogenous pre-mixed fuel-air mixture by a piston. Usually creviced pistons ensure a homogenous adiabatic core in the center of the reaction chamber which permits the assumption of an isentropic relation between the measured pressure and gas temperature. Despite the ideal core gas compression, non-ideal effects such as heat loss, differences in the compression behavior, and ultimately non-standardized design and operation of rapid compression machines lead to different experimental results in different facilities at nominally the same end of compression conditions. In this study ignition delay times of ethanol are investigated at four different conditions in five independent RCMs. As expected, the raw results of the different facilities indeed show notable differences at the same end of compression conditions. However, according to the adiabatic core hypothesis the agreement between kinetic simulations and experiments should be consistent for all facilities provided that the facility effects are correctly accounted for. To elaborate upon this hypothesis, a kinetic mechanism is optimized to reflect the experimental results of all facilities. In the end, the optimized mechanism predicts all experimental data within the expected uncertainty. This confirms the reliability of RCM experiments for kinetic investigations and the validity of the effective volume approach in simulating RCM data. |
Keywords: | Ethanol Facility effects Rapid compression machine |
Publisher: | Elsevier Inc. | Journal: | Combustion and flame | ISSN: | 0010-2180 | EISSN: | 1556-2921 | DOI: | 10.1016/j.combustflame.2024.113338 | Rights: | © 2024 The Authors. Published by Elsevier Inc. on behalf of The Combustion Institute. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). The following publication Büttgen, R. D., Preußker, M., Kang, D., Cheng, S., Goldsborough, S. S., Issayev, G., Farooq, A., Song, H., Fenard, Y., Vanhove, G., Mohamed, A. A. E.-S., Curran, H. J., & Heufer, K. A. (2024). Finding a common ground for RCM experiments. Part B: Benchmark study on ethanol ignition. Combustion and Flame, 262, 113338 is available at https://doi.org/10.1016/j.combustflame.2024.113338. |
Appears in Collections: | Journal/Magazine Article |
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1-s2.0-S0010218024000488-main.pdf | 2.98 MB | Adobe PDF | View/Open |
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