... The depletion of fossil fuels and the worst impact on environmental pollution caused of their burning have led to the search for renewable clean energies. Nowadays, there are many sources of ... with the optimum trade-off between NOX and smoke emissions. Therefore, as shown in Table 3, the comparison between the effects of EGR rates within limits of 5-15% on engine performance and ... the expense of increase in smoke, CO and unburned HC emissions. The aim of the current study is to investigate the effect of EGR on performance parameters and exhaust emissions of an indirect...