柴油机可调两级增压系统调节规律仿真研究

Research on regulation rule of diesel engine adjustable two-stage turbocharging system

采用GT-POWER建模,对WP7柴油机可调两级增压系统进行模拟计算,分析高压级旁通阀的调节规律。结果表明,增压系统的总压比、低压级压比和高压级压比均随高压级旁通阀开度的增大逐渐下降,其中总压比受旁通阀的开度变化影响最明显,在75%负荷时,随着旁通阀开度的变化,总压比变化幅度达到了2.33。涡轮增压器的总效率随旁通阀开度的增大显著下降,当旁通阀采用蝶阀时,开度大于一定程度后,总效率下降的速度明显趋缓。

The GT-POWER model was used to simulate the adjustable two-stage turbocharging system of WP7 diesel engine.The regulation rule of the high-pressure bypass valve was analyzed.The results showed that the total pressure ratio,low-pressure stage pressure ratio and high-pressure stage pressure ratio of the booster system decreased gradually with the increase of the opening of the high-pressure bypass valve.Among them,the total pressure ratio of the booster system was particularly affected by the change of the opening of the bypass valve.At 75%load,with the change of bypass valve opening,the total pressure ratio change reached 2.33.The overall efficiency of turbocharger decreased significantly with the increase of bypass valve opening.When a butterfly valve was used for the bypass valve,after the opening degree was greater than a certain degree,the total efficiency decline rate was obviously slowed down.