원심 펌프 임펠러의 생체모방공학 기반 최적화 연구: 입구 유동 조건의 영향

• Published in: 한국전산유체공학회지 Vol. 29; no. 3; pp. 97 - 108
• Main Authors: 오창종(C. Oh), 김조현(J. Kim), 강성원(S. Kang)
• Format: Journal Article
• Language: Korean
• Published: 한국전산유체공학회 01.09.2024
• Subjects: 기계공학; 형상 최적화(Shape optimization); 결절(Tubercle); 원심 펌프(Centrifugal pump); 생체모방공학(Biomimetics); 임펠러(Impeller); 와류 붕괴(Vortex breakdown)
• ISSN: 1598-6071; 1598-6071
• DOI: 10.6112/kscfe.2024.29.3.097

We aim at analyzing the mechanism of passive flow control by a biomimetic tubercle shape for impeller trailing edge(TE) in a centrifugal pump and the effect of inflow conditions. A shape optimization process of tubercle heights was performed for two different inflow conditions that approximate the conditions of a three-stage centrifugal pump. The composite efficiency of the pump increased by up to 0.77%. Compared to the streamwise periodic condition, the inflow-outflow condition showed larger increase in the pump efficiency and decrease of the turbulent intensity. Among different tubercles along TE, a specific tubercle had a relatively large effect on the results. Vortex structures were examined using the Q-criterion and swirling strength. It was observed that the orientation of the vortices behind TE changed from spanwise to streamwise by the tubercle TE. Counter-rotating streamwise vortices were generated at the top and bottom of each tubercle, and the interaction of the vortex pair led to vortex breakdown, resulting in a decrease in the turbulent intensity. KCI Citation Count: 0