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RISS 인기검색어
- 검색키워드
- 저자 : Kaicheng Zhu (검색결과 2 건)
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BaoLing Cui,Kaicheng Zhu,Yuliang Zhang,Peifeng Lin 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.10
Cavitation is a problem that must be considered when designing and operating a pump. This study proposes an active method using a jetting device to improve its cavitation performance. The influence of jetting flow rate on the external characteristics and cavitation performance of a centrifugal pump is analyzed through numerical simulation and experiment. Results show that the jetting fluid can improve the cavitation performance of a pump and the effect is most evident in the 6 % jetting flow rate. The distribution of entropy generation at the inlet pipe before the impeller shows that jetting flow can increase hydraulic loss in the pipe, thereby diminishing the performance of the centrifugal pump. An analysis of the transient cavitation flow in the centrifugal impeller under 6 % jetting flow rate reveals that the generation, development, and rupture of bubbles deteriorate the flow structure in the passage, thereby resulting in unstable flows and forces.
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Influence of the jetting fluid on the internal flow in a centrifugal pump with jetting device
BaoLing Cui,Qianqian Yang,Kaicheng Zhu 대한기계학회 2023 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.37 No.3
Jetting the high pressure fluid from the outlet to the inlet is one of the methods to improve the cavitation characteristics. The influences of different jetting flow rates on the external characteristics and internal flow were investigated in the centrifugal pump with jetting device. The experiments were carried out to verify the performance calculated from the numerical simulation. The internal flow was analyzed under the design condition with 0-10 % jetting flow rate. The results indicate the jetting fluid makes the distributions of velocity more uneven in the jetting device. As the jetting flow increases, the entropy generation rate in the jetting device and inlet pipeline shows an incrementally increasing trend, indicating that the hydraulic loss is gradually increasing. At the same time, the pressure at the inlet of the impeller increases, and the turbulent kinetic energy decreases at the centrifugal pump impeller. This research is of great significance to effectively improve operational stability of the centrifugal pump.
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