Research On Reverse Design Of The Turbocharger For Gasoline Engine

Turbochargers can improve engines'power performance and reduce exhaust emissions without changing their capacity. They were mainly used in diesel engines firstly. Recently gasoline engines also used turbochargers more and more. The development of turbochargers for gasoline engines is more difficult than that for diesel engines. Because domestic research began later, so we fell behind in technologies, so it becomes very important to get the advanced technologies as soon as possible. The major objective of this research is to implement accurate surface reconstruction and perfect surface quality of the turbocharger.The structure of the turbocharger and how it works are studied. It is the theory base of the following research.Digitization strategies of the Turbocharger for gasoline engine are studied, and the complex parts such as turbine,impeller and two scrolls are realized with high quality and efficiency in this thesis. Firstly, these important parts of the turbocharger are analyzed systematically. A series of digitization strategies including measurement method and relocation of the clouds are presented; Secondly, reverse modeling of these important parts is carried out; Finally, the digitization of the whole turbocharger is realized.For ensuring the strength and vibration performance of the digital model to meet the demand, FEA software is used to calculate and analyzed them. This guarantees the production of the turbochargerA series of tests including high temperature fatigue,performance of compressor and whole turbocharger test are processed. The results show that, the new turbocharger is approximately same as the original one in the performance.