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Two stage turbo charging provides a suitable method to achieve a significant increase of the boost level, as well as a wider operating range for a diesel engine. This paper describes detailed and easily applicable method for two stage turbocharger matching for constant speed engine, in view of finding an optimal combination of turbochargers - low and high pressure ones. It also describes technique that can be used for optimizing solution with better fuel consumption and boosting together with satisfying of all given constraints such as maximum before turbine and compressor out temperatures, maximum turbocharger speed, peak cylinder pressures and smoke limit. This paper presents evaluation of potential for two stage turbocharger for power generation application by simulation and then experimental results.

In Direct Injection (DI) diesel engines, combustion gets affected by change in in-cylinder air motion and Fuel injection system characteristics. Computational Fluid Dynamics (CFD) based models give detailed insight into the combustion phenomena. The present work investigates the effect of different combustion chamber geometries and fuel injection system parameters on engine emissions and performance aiming to improve trade-off between NOx and smoke. AVL FIRE CFD software is used in this work. Research engine having 9 liter capacity of heavy duty application has been selected for the study. Seven hole injector is used with mechanical fuel injection system having 1000 bar maximum pressure capability. Inputs required to model complex combustion process in the AVL FIRE are derived from one dimensional engine simulation software AVL BOOST.