静圧過給舶用ディーゼル機関の排気脈動の研究

(第二報 その1 分岐・合流部の流れおよび脈動の共振特性)

抄録

Since energy saving became an urgent problem, the constant pressure turbocharge system has been increasingly adopted especially in marine diesel engines because of its high thermal efficiency in the range of high mean effective pressure.
Many cylinders are connected with one common exhaust pipe in this system. The exhaust pulsation is, therefore, so complicated that it gives adverse effect on some engines. However, it was difficult to take effective counter-measures when needed because the characteristics of the pulsation were not clear.
The purpose of this study is, therefore, to clarify the characteristics of the exhaust pulsation in the constant pressure turbo-charge system and to establish a simulation system for it.
As the result of the study, some of the characteristics have been made clear and a simulation system has been established.
In this report the characteristic of flow at branch is to be firstly discussed and then it is presented that resonance can occur in the exhaust pulsation in this system in the range of ordinary revolutional speed of the engines.