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Implementation of J-Groove in a jet pump for cavitation improvement
Ujjwal Shrestha(쉬레스트 우즈왈),Young-Do Choi(최영도) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.8
Jet pump contributes to transport the objects of liquid single phase flow or solid-liquid two-phase flow, which has a merit of very simple structure without moving body. However, the pump has an inevitable demerit of cavitation occurrence in the pump passage and the cavitation phenomenon damages the transport object. This study presents the numerical investigation to improve the cavitation performance of an annular jet pump (AJP) using J-Groove. J-Groove is the passive rectangular grooves installed on the wall of pump mixing zone passage to the flow direction and the grooves entrain high pressure fluid from the diffuser to the throat of AJP. The installation of J-Groove on the pump passage wall increases the pressure in the mixing zone of AJP and improves the pump cavitation performance. In this study, the effectiveness of JGroove has been evaluated by the parametric study of J-Groove design variables (depth, length, angle and number). The study results reveal that each design variable of J-Groove has its influence on the increase of fluid pressure in the mixing zone of AJP. [그림 본문 참조]