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논문 기본 정보

자료유형
학술대회자료
저자정보
Vincent Lijo (안동대학교) 김희동 (안동대학교) T. Setoguchi
저널정보
대한기계학회 대한기계학회 춘추학술대회 대한기계학회 2009년도 유체공학부문 춘계학술대회 논문집
발행연도
2009.5
수록면
98 - 103 (6page)

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초록· 키워드

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The objective of the present study is to analyze the effect of pressure ratio on the start-up process of an ejector with finite volume secondary chamber. The present study is also intended to identify the evacuation performance of vacuum ejector-diffuser systems under different pressure ratios and to identify an optimum pressure ratio which will give the lowest possible vacuum inside the secondary chamber with minimum time required to reach steady state operation. Commercial software Fluent 6 is used to perform the analysis. The results obtained show that the there exists an optimal pressure ratio for the maximum evacuation performance and ejector performance is increased for this pressure ratio by the prevention of back-flow into the secondary chamber. The one and only condition in which a back-flow into the secondary chamber is eliminated in such types of ejectors is the diffuser starting mode. It is also shown that in the diffuser un-starting mode there is always circulation into the secondary chamber which was detrimental to the ejector performance particularly when it is used in HAT facilities as it can lead to resonating vibration when the natural frequency of the test nozzle coincides with the pressure fluctuation inside the secondary chamber caused by recirculation.

목차

Abstract
1. INTRODUCTION
2. Computational Methodology
3. Results and Discussion
4. Conclusions
References

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UCI(KEPA) : I410-ECN-0101-2009-550-018663910