Simulations of the diesel engine performance with a two-stage sequential turbocharging system at different altitudes

The turbocharging system of a six-cylinder diesel engine is analysed. It shows that the original single-stage turbocharger cannot meet the requirement that the engine should maintain a certain power output at different altitudes owing to the significant differences in the air density. A two-stage sequential turbocharging system is proposed, and the specific parameters of this turbocharging system are determined on the basis of the required power recovery of this engine. The engine performances at different altitudes with this two-stage sequential turbocharging system are simulated. The results show that, through switching between single-stage turbocharging and two-stage turbocharging, the engine power output can remain the same as that at sea level up to 2000 m and it can be recovered to 80% at 5500 m.