한국추진공학회:학술대회논문집 (Proceedings of the Korean Society of Propulsion Engineers Conference)
- 한국추진공학회 2009년도 춘계학술대회 논문집
- /
- Pages.299-302
- /
- 2009
- /
- 1975-342X(pISSN)
진공 이젝터-디퓨져 시스템내의 비정상 유동 과정에 관한 연구
A Study on the Transient Flow Process in a Vacuum Ejector-Diffuser System
초록
The objective of the present study is to analyze the transient flow through theejector system with the help of a computational fluid dynamics (CFD) method. An attempt is made to investigate the interesting and conflicting phenomenon of the infinite entrainment into the primary stream without an infinite mass supply from the secondary chamber. The results obtained show that the one and only condition in which an infinite mass entrainment can be possible in such types of ejectors is the generation of a re-circulation zone near the primary nozzle exit. The flow in the secondary chamber attains a state of dynamic equilibrium of pressures at the onset of the recirculation zone. A steady flow in the ejector system is valid only after this point.