Summary

In the presented study, heat balance has been investigated theoretically at different speeds in various diesel engines by using zero-dimensional multi-zone thermodynamic model and effects of the engine speed on the heat balance have been studied. In addition, heat balance has been examined experimentally for gasoline fumigation in a single cylinder diesel engine and comparisons of theoretical results and experimental have also been performed. Although various experimental heat balance studies for diesel engines have been performed in the literature, theoretical heat balance studies are limited. For this reason heat balance has been investigated in two different turbocharged direct injection (DI) diesel engines and in a natural aspirated diesel engine and numerical application results have been evaluated. In addition some experimental heat balance results obtained from gasoline fumigation tests in a single cylinder DI diesel engine have been given and comparisons of experimental and theoretical results have been done. A zero-dimensional multi-zone thermodynamic model developed earlier by authors has been adapted for heat balance analysis and used to calculate heat balance theoretically.