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Superchargers are engine driven positive displacement devices which increase the air mass flow into the engine, thereby leading to a better combustion efficiency. This gives an advantage of extracting more power from the same engine [1], thereby reducing emissions and achieving a better fuel economy [2]. With emission norms getting more and more stringent, the need for boosting engine intake air becomes very important [3]. There are many types of superchargers based on design [4], out of which, the roots-type positive displacement supercharger, is discussed in here. A 1-dimensional model of supercharger gives flexibility of choosing the right aspect ratio (length to the diameter of the rotor), deciding on the clearances (a tradeoff between volumetric efficiency and manufacturing capabilities) and arriving at the inlet and discharge port dimensions.

Evaluation of a new concept of fuel injection in Diesel engines is presented in this paper. Different fuel injection systems available in market today have their own inherent energy loss in the fuel injection process and limitations in terms of maximum possible pressure at lower engine speeds. It is clear that any advancement to existing fuel injection system or introduction of new systems with better performance on energy efficiency will have a major influence on the market share. A relatively new concept of using water-hammer for fuel injection is studied in this present work and the findings have been recorded. Comparison of simulation and experiment results aided the evaluation of simulation model against system performance on bench. It is concluded that possibility of harnessing energy from water-hammer exists even though the phenomenon itself is considered a loss making one.