发动机废气涡轮增压系统的能量流研究

基于发动机一维性能仿真计算和试验相结合的方法,对某型轿车用柴油机的废气涡轮增压系统能量流分布规律进行了研究.通过研究发动机排气能量在涡轮机-压气机-中冷器中的传递过程,得出了涡轮机回收排气能量的潜力和增压系统的能量流特性.结果表明:增压系统能量流分布和排气能量回收效率主要取决于发动机和增压器的运行工况;外特性下,在增压...

A Study on the Energy Flow of Diesel Engine Turbocharged System

Presented in this paper is the energy flow distribution of a diesel engine turbocharged system, on the basis of a combined method of one-dimensional gas dynamics simulation and dyno tests. By analyzing the flow path of exhaust gas energy flow from turbine to compressor and then intercooler, the exhaust gas energy recovery potential by turbocharging was obtained, and the energy flow characteristics in the diesel engine turbocharged system was analyzed. The results have shown that the energy recovery potential is strongly dependent on the engine''s and the turbo''s operational conditions. About 13% of engine exhaust gas energy could be recovered by the turbocharger when the latter works in the high efficiency domain, while only about 6% could be recovered in the low efficiency domain. Under all operational conditions, around 2% of the recovered exhaust gas energy is used to boost the intake gas pressure, and the rest is taken away by the intercooler. The results have provided theoretical basis and fundamental data for engine fuel saving through exhaust gas energy recovery by turbocharging or turbo-compounding.