Detached Eddy Simulation of syngas combustion in a reverse-flow configuration

Pramanik, S and Ravikrishna, RV (2020) Detached Eddy Simulation of syngas combustion in a reverse-flow configuration. In: International Journal of Hydrogen Energy .

PDF int_jou_hyd_ene_2020.pdf - Published Version Restricted to Registered users only Download (4MB) | Request a copy

Abstract

The combustion of low calorific value syngas in a 3.3-kW reverse-flow chamber under moderate or intense low-oxygen dilution (MILD) (global equivalence ratio Φglobal = 0.89) and ultra-lean (Φglobal = 0.32) conditions have been numerically investigated with detailed chemistry. Reynolds averaged Navier Stokes (RANS)/Detached eddy simulation (DES) models for flow and Eddy dissipation concept (EDC)/Flamelet generated manifold (FGM) models for combustion have been used. Quantitative measurements of temperature, OH radical, and CO emissions performed in the same combustor are used to validate and compare the models. The prediction of the minor species OH is a special focus of the present study. The fields of velocity, mixture fraction, and kinetic parameters have been investigated in detail. The DES-EDC model performs the best in predicting the scalar distributions, although the computational cost is highest. The RANS model predicts insufficient mixing and higher velocities leading to a delayed reaction zone. The FGM model consistently predicts early ignition that has been attributed to the lack of a suitable progress variable and the use of the diffusion flamelet to represent the thermochemistry. However, the FGM model is promising with suitable modifications due to the low computational cost. The present study also provides a comprehensive dataset in a reverse-flow chamber operating under MILD and ultra-lean conditions for validation of numerical models. © 2020 Hydrogen Energy Publications LLC

Item Type:	Journal Article
Publication:	International Journal of Hydrogen Energy
Publisher:	Elsevier Ltd
Additional Information:	The copyright of this article belongs to Elsevier Ltd
Keywords:	Free radicals; Navier Stokes equations; Synthesis gas, Computational costs; Detached eddy simulations; Detailed chemistry; Eddy dissipation concept; Global equivalence ratio; Quantitative measurement; Reynolds-Averaged Navier-Stokes; Validation of numerical model, Reverse combustion
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	24 Aug 2020 07:14
Last Modified:	24 Aug 2020 07:14
URI:	http://eprints.iisc.ac.in/id/eprint/66387

Actions (login required)

View Item