Experimental investigation of the effect of turbo shaft speed on engine performance of a six cylinder diesel engine

Since the invention of internal combustion engines, obtaining more power from the same engine volume has been one of the emerging research topics. As one of the supercharging systems, the turbocharger aims to obtain more power from the engine by increasing the amount of air sent to the combustion chamber of the engine. The turbocharger assembly consists of two basic components, the turbine and the compressor. The turbocharger system uses the energy of combustion exhaust gasses to compress the air entering the engine. Pressurized and compressed more air is transmitted to the combustion chamber, so that denser air is sent to the same volume. In this study, engine performance and exhaust emissions values of six-cylinder and water-cooled diesel engine, which is run with standard diesel fuel, were measured at different turboshaft speeds by adjusting the wastegate pressure. The experiments were carried out under full load and at different turboshaft speeds at engine speeds of 1000, 1500, 1800 rpm. In the study, it was observed that an increase in the turboshaft speed increased in the engine torque and power when the engine was at full load and 1500 rpm. As the turbocharger speed increased, the soot, CO and NOx emissions decreased and the HC emissions increased. Adjusting waste gate pressure to 2.6 bar when the engine is at full load and 1500 rpm has increased the exhaust manifold temperature excessively and the safe zone has been exceeded.