发动机废气涡轮增压系统的能量流研究

复杂技术创新是发展中国家进行产业结构升级的一个重要努力方向，也是我国实施自主创新战略的重要方面。高度不确定性是复杂技术创新的主要特征，如何从创新模式及组织形式等方面减少创新过程的不确定性，成为复杂技术创新管理的关键所在。复杂技术创新过程中需要多种知识和技能并且需要创造新知识，创新主体对知识资源的获取成为复杂技术创新不确定性的主要来源。自组织网络能够有效降低这种不确定性，从而促进复杂技术创新。

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.