Abstract
The local heat-release rate and the thermo-chemical state of laminar methane and dimethyl ether flames in a side-wall quenching configuration are analyzed. Both, detailed chemistry simulations and reduced chemistry manifolds, namely Flamelet-Generated Manifolds (FGM), Quenching Flamelet-generated Manifolds (QFM) and Reaction-Diffusion Manifolds (REDIM), are compared to experimental data of local heat-release rate imaging of the lab-scale side-wall quenching burner at Technical University of Darmstadt. To enable a direct comparison between the measurements and the numerical simulations, the measurement signals are computed in all numerical approaches. Considering experimental uncertainties, the detailed chemistry simulations show a reasonable agreement with the experimental heat-release rate. The comparison of the FGM, QFM and REDIM with the detailed simulations shows the high prediction quality of the chemistry manifolds. For the first time, the thermo-chemical state during quenching of a dimethyl ether-air flame is examined numerically. Therefore, the carbon monoxide and temperature predictions are analyzed in the vicinity of the wall. The obtained results are consistent with previous studies for methane-air flames and extend these findings to more complex oxygenated fuels. Furthermore, this work presents the first comparison of the QFM and the REDIM in a side-wall quenching burner.
Highlights
In the context of global warming and limited resources, the development of low-emission and high-efficiency combustion applications arises
This work is the first complementary numerical investigation based on these experiments using detailed chemistry (DC) simulations, as well as chemistry manifolds, namely Flameletgenerated Manifolds (FGM), Quenching Flamelet-generated Manifolds (QFM) and Reaction-Diffusion Manifolds (REDIM)
We focus on the local heat-release rate (HRR) during side-wall quenching (SWQ)
Summary
In the context of global warming and limited resources, the development of low-emission and high-efficiency combustion applications arises. Reduced chemistry approaches based on tabulated manifolds combine the high prediction accuracy of the chemical state of a DC simulation with low computational costs. Flame-wall interaction effects have practical relevance for several thermo-chemical processes, e.g. in internal combustion engines and gas turbines (Dec and Tree 2001; Drake and Haworth 2007; Hyvönen et al 2005). Flame-wall interactions in a side-wall quenching (SWQ) geometry were studied experimentally (Jainski et al 2017a, b; Kosaka et al 2019, 2018) and numerically (Ganter et al 2017, 2018; Efimov et al 2019) for methane-air flames. This work is the first complementary numerical investigation based on these experiments using DC simulations, as well as chemistry manifolds, namely Flameletgenerated Manifolds (FGM), Quenching Flamelet-generated Manifolds (QFM) and Reaction-Diffusion Manifolds (REDIM).
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