【摘要】 二级增压系统在重型柴油机和高性能轿车柴油机上均有良好的应用前景。为获得结构更为紧凑的二级增压系统,提出了将调节阀集成在高压级涡轮壳内部的二级增压系统结构方案,进行了增压系统与柴油机的匹配计算、两个涡轮壳的设计计算、调节阀计算以及流动分析,并对所设计的二级增压系统进行了试验研究。调节阀流通性能试验结果表明:高压级涡轮膨胀比在1.2到2的变化范围时,调节阀的流量调节范围达30%以上。紧凑型二级增压系统的联合运行性能试验结果表明:系统可以有效工作,且运行在高效率区。更多还原

【Abstract】 The two-stage turbocharging systems have showed a promising application for the heavy duty diesel engines and high performance vehicle diesel engines.A regulation valve of a two-stage turbocharging system is arranged into the high pressure turbine volute to reduce the system sizes.Matching calculations for the turbocharging system and a diesel engine are made.Calculations in designing of two turbine volutes and regulating valve were taken.Experiments are conducted with the designed system.The performance tests of the regulating valve showed that the valve could by pass 30%mass flow when the expansion ratio of the high pressure stage varies from 1.2 to 2.The performance tests of the two-stage turbocharging system showed that the system worked effectively with high efficiency.更多还原