Using CFD to Calculate the Supercharged Flow of IC Engine Through Exhaust Pressure
Date Issued
2004
Date
2004
Author(s)
He, Jun-Hui
DOI
zh-TW
Abstract
The exhaust emission of two-stroke motorcycle engine is more serious than that of four-stroke engine, so it will be eliminated. But most of 50 c.c. motorcycles use two-stroke engines. The four-stroke 50 c.c. motorcycle will have the problem of lower power output, so we have to increase the power output of the engine. About one-third of input energy of internal combustion engine is released to ambient by exhaust gas. If we use the exhaust gas of engine to drive a supercharger that will increase the performance of engine, and can further reduce the exhaust emission.
By reviewing the history of supercharged internal combustion engine; we found out that almost all of supercharged methods have been developed was used for car or truck, none of them can be used for motorcycle. So designing a supercharger for motorcycles will be a subject that is worthy of studying.
This research used the principle of piston motion. There is a slider in the cylinder that is separated to exhaust chamber and fresh air chamber by this slider. Two small pipes were attached at the ends of cylinder. The fresh air chamber attached to the region in front of inlet throttle, and the exhaust chamber attached to the exhaust pipe of engine. The pressure difference between two sides of slider makes the slider to move in the cylinder that can boost the fresh air in the fresh air chamber to flow into the engine cylinder. That can increase the volumetric efficiency, and hence improve the engine performance.
This research used the computational fluid dynamic software “CFD-RC” to simulate the said supercharger. In the different operation condition, we analyze the supercharging pressure and the mass flow rate of this supercharger.
Subjects
CFD-RC
進氣增壓
引擎廢氣
Supercharging
Exhaust Gas
Type
thesis
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