정량펌프에서의 cavitation발생 억제를 위한 수치해석적 연구

Abstract

Diaphragm metering pump has been known to allow exact amount of flow rate by combining two sets of the pumps and superposing the two different phase of flow rate. However, contrary to the direct plunge type metering pump, the diaphragm type of metering pump is known to yield pulsation due to indirect pushing mechanism via working fluid between piston & diaphragm. The working fluid could get easily involved with cavitation because of rapid change of piston movement and abrupt fluid passage area change. The research was devoted to reducing pulsation in diaphragm metering pump by the use of numerical analysis. The numerical study was conducted by considering unsteady, incompressible, turbulent (k-ε model) flow with moving boundary. Pressure drop at peculiar point of the flow field is focal point of research in order to reduce cavitation. Successful pulsation reduction through geometry modification, is validated by the actual experiments that revealed overall performance of the system with & without modification.