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Supercharging is a process which is used to improve the performance of an  engine by increasing the specific power output whereas exhaust gas  recirculation reduces the NOx produced by engine because of supercharging. In  a conventional engine, supercharger functions as a compressor for the forced  induction of the charge taking mechanical power from the engine crankshaft.  In this study, supercharging is achieved using a jet compressor. In the jet  compressor, the exhaust gas is used as the motive stream and the atmospheric  air as the propelled stream. When high pressure motive stream from the engine  exhaust is expanded in the nozzle, a low pressure is created at the nozzle  exit. Due to this low pressure, atmospheric air is sucked into the expansion  chamber of the compressor, where it is mixed and pressurized with the motive  stream. The pressure of the mixed stream is further increased in the  diverging section of the jet compressor. A percentage volume of the  pressurized air mixture is then inducted back into the engine as supercharged  air and the balance is let out as exhaust. This process not only saves the  mechanical power required for supercharging but also dilutes the constituents  of the engine exhaust gas thereby reducing the emission and the noise level  generated from the engine exhaust. The geometrical design parameters of the  jet compressor were obtained by solving the governing equations using the  method of constant rate of momentum change. Using the theoretical design  parameters of the jet compressor, a computational fluid dynamics analysis  using FLUENT software was made to evaluate the performance of the jet  compressor for the application of supercharging an IC engine. This evaluation  turned out to be an efficient diagnostic tool for determining performance  optimization and design of the jet compressor. A jet compressor was also  fabricated for the application of supercharging and its performance was  studied.

IC engine supercharging and exhaust gas recirculation using jet compressor