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

Cristiano Henrique Gonçalves de Brito¹; José Ricardo Sodré¹; Cristiana Brasil Maia¹

¹ Pontifícia Universidade Católica de Minas Gerais

doi:10.20906/CPS/COB-2015-1399

Resumo

This paper presents a study of the heat transfer in the exhaust pipe of a diesel power generator to determine the exhaust gas temperature profiles. The numerical simulations were performed for the engine operating under the loads of 0, 10, 20 and 40 kW. The Ansys CFX software was used to solve the conservation and transport equations of the turbulent fluid flow. The k-omega SST turbulence model was used, along with literature correlations for the convection heat transfer coefficient. The numerical results for heat transfer in exhaust gas were compared with literature data. The results revealed that the temperature gradient increased with increasing load applied to the engine, causing enlargement of the temperature profiles as a consequence of increased temperature and reduced mass flow rate of the exhaust gas. Also been found that the temperature profiles are significantly altered by recirculation of fluid flow caused by adverse pressure gradients. The results showed good agreement with literature data.

Palavras-chave: Numerical simulation; Exhaust gas temperature; Diesel engine; Energy; CFD