Abstract
Sequential turbocharging is the most effective method to improve the performance for high pressure diesel engine at low load. Pneumatic butterfly valve system is an important part of diesel engine. A three-dimensional flow field numerical simulation mode was established based on FLUENT software for pneumatic butterfly valve system, which provides a theoretical basis for the analysis of pneumatic butterfly valve performance. Research results show that the air rate in exhaust chamber is larger than inlet chamber, the velocity in the electromagnetic valve throttle of inlet pipe is maximum, and inlet throat velocity variation is not obvious. When the fluid flow from the inlet pipe through into the inlet throat and chamber, the flow velocity take on a spurting shape of the throat as a vertex. Along with the increase of pressure in the intake cylinder, the pressure differential is reduced between the throttle and throat, flow speed obviously showed a trend of slowing down.
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