Numerical simulation was utilized to investigate the influence of different centrifugal casting methods on TiAl alloy turbocharger forming

and the formation of TiAl alloy turbocharger with centrifugal top injection

centrifugal side injection and centrifugal bottom injection was analyzed according to the melt filling characteristics and melt filling temperature. The results indicate that centrifugal top injection has a better melt filling stability

and gas is discharged completely from the turbocharger cavity

and temperature decrease is less during filling

which is the most conducive to the formation of TiAl alloy turbocharger. The melt filling stability of centrifugal side injection also has a better melt filling stability

however

the gas is vented to the tip of the blade where the vent is difficult to open

meanwhile the melt temperature is lower at the last filling position

and the melt filling temperature difference between different blades is high

which is not conducive to TiAl alloy turbocharger formation. The centrifugal bottom injection has desirable melt filling stability

and the gas is discharged to the top of the turbocharger where the vent is easy to open

and the melt filling temperature is lower while the temperature difference between different blades is slight

which is suitable for TiAl alloy turbocharger formation under higher pouring temperature or shell preheating temperature. Well-formed TiAl alloy turbochargers were manufactured by actual casting test with centrifugal top injection.