Experimental Study on the Compressor Performance of Two Stage Turbocharging System

In order to study the performances of the high & low stage compressors and that of the system as a whole,a two-stage turbocharging system was matched,and a special two stage turbocharging system test bench was set up.For each test curve,the speeds of the two stage turbochargers were adjusted to some fixed data,and the compressor performance experiment carried out.The results showed that,there is much difference between the corrected mass flow and actual mass flow of the high stage compressor.In order to find out the actual supercharging effect of the two stage turbocharging system,it is better to adopt the actual mass flow. The two stage turbocharging system has much higher efficiency under most operating conditions if the pressure ratio assignment is 1∶1.The system can get very high supercharging pressure when the speeds of the two stage turbochargers are rather low,which ensures the system's security and reliability.