关键词: 二级增压系统, 总压缩功, 中冷器, 压力损失

Abstract: To discuss the total compressing power of the single stage turbocharing system and the two-stage turbocharging system, the compressing processes of two systems are theoretically analyzed on the P-V diagram. The test is carried on a special two-stage turbocharging test bench, and the test result of the two-stage system is compared with that of the single stage system. The results indicate that, the total compression power of the two-stage turbocharging system maybe larger than that of the single stage system because of the pressure losses in the intercooler and pipes. Only all the conditions are satisfied,that means the total pressure ratio is higher enough, the temperature drop is bigger enough, the pressure losses of intercooler are less enough, and both the high and low stage compressors operate with high efficiency, the two-stage turbocharging system can be advantageous.

Key words: two-stage turbocharg ing system, total compression power, intercooler, pressure losses