LES/flamelet/ANN of oxy-fuel combustion for a supercritical CO2 power cycle

Large eddy simulation (LES) employing a flamelet model coupled with an artificial neural network (ANN), namely the LES/flamelet/ANN is developed for supercritical oxy-fuel combustion and its validity is investigated in detail. An ANN is introduced to reduce the size of the flamelet library for non-a...

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Bibliographic Details
Published in:	Applications in energy and combustion science Vol. 12; p. 100083
Main Authors:	Kasuya, Hiroki, Iwai, Yasunori, Itoh, Masao, Morisawa, Yuichi, Nishiie, Takayuki, Kai, Reo, Kurose, Ryoichi
Format:	Journal Article
Language:	English
Published:	Elsevier 01-12-2022
Subjects:	Artificial neural network Flamelet/progress-variable model Large eddy simulation Oxy-fuel supercritical CO2 cycle
Online Access:	Get full text
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Summary:	Large eddy simulation (LES) employing a flamelet model coupled with an artificial neural network (ANN), namely the LES/flamelet/ANN is developed for supercritical oxy-fuel combustion and its validity is investigated in detail. An ANN is introduced to reduce the size of the flamelet library for non-adiabatic three gas-stream conditions of a real supercritical carbon dioxide (CO2) combustor. The fuel and oxidizer are methane (CH4) and a mixture of oxygen (O2) and CO2, respectively. To consider the real gas effect, the Soave-Redlich-Kwong (SRK) equation of state is solved to generate the flamelet library. The LES/flamelet/ANN is applied to two combustion fields in the combustor, namely the upstream and full fields of the combustor with low and high mesh sizes, respectively. The LES/flamelet/ANN for the upstream field is conducted to examine its applicability to the non-adiabatic three gas streams condition by varying the resolution of the flamelet library and by comparing it with the results obtained by the conventional LES/flamelet. The LES/flamelet/ANN for the full field is also conducted to validate the approach by comparing its results with those obtained from the experiment. The results show that the LES/flamelet/ANN of the upstream field properly reproduces the supercritical combustion behavior generated by the conventional LES/flamelet while maintaining the same level of computational cost. Furthermore, the LES/flamelet/ANN for the full field reasonably predicts the supercritical combustion behavior in the experiment, and the predicted combustor outlet temperature agrees well with the experimental results.
ISSN:	2666-352X 2666-352X
DOI:	10.1016/j.jaecs.2022.100083