Numerical analysis of heat transfer in the exhaust gas flow in a diesel power generator

J. R. Sodré, C. H.G. Brito, C. B. Maia

Research output: Contribution to journalConference article

Abstract

This work presents a numerical study of heat transfer in the exhaust duct of a diesel power generator. The analysis was performed using two different approaches: the Finite Difference Method (FDM) and the Finite Volume Method (FVM), this last one by means of a commercial computer software, ANSYS CFX®. In FDM, the energy conservation equation was solved taking into account the estimated velocity profile for fully developed turbulent flow inside a tube and literature correlations for heat transfer. In FVM, the mass conservation, momentum, energy and transport equations were solved for turbulent quantities by the K-ω SST model. In both methods, variable properties were considered for the exhaust gas composed by six species: CO2, H2O, H2, O2, CO and N2. The entry conditions for the numerical simulations were given by experimental data available. The results were evaluated for the engine operating under loads of 0, 10, 20, and 37.5 kW. Test mesh and convergence were performed to determine the numerical error and uncertainty of the simulations. The results showed a trend of increasing temperature gradient with load increase. The general behaviour of the velocity and temperature profiles obtained by the numerical models were similar, with some divergence arising due to the assumptions made for the resolution of the models.

Original languageEnglish
Article number032015
JournalJournal of Physics: Conference Series
Volume745
Issue number3
DOIs
Publication statusPublished - 21 Oct 2016
Event7th European Thermal-Sciences Conference, Eurotherm 2016 - Krakow, Poland
Duration: 19 Jun 201623 Jun 2016

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