[논문]반구형 융기부를 이용한 벤투리에서의 캐비테이션 제어

황종빈; 신이수; 김주하

doi:10.5407/jksv.2023.21.2.091

반구형 융기부를 이용한 벤투리에서의 캐비테이션 제어
Control of cavitation in Venturi using hemispherical bump 원문보기

한국가시화정보학회지= Journal of the Korean society of visualization, v.21 no.2, 2023년, pp.91 - 101

황종빈 (Department of Mechanical Engineering, Ulsan National Institute of Science and Technology) , 신이수 (Department of Mechanical Engineering, Ulsan National Institute of Science and Technology) , 김주하 (Department of Mechanical Engineering, Ulsan National Institute of Science and Technology)

Abstract ▼ AI-Helper

In this study, we investigated how the performance of a Venturi changes when a hemispherical bump is applied to the divergent part of the Venturi tube and what causes the performance difference. The Venturi-tunnel experiment was conducted in the Reynolds number range of 0.2 × 105 - 1.2 × 105 and cavitation number range of 0.9 - 10. The bump was found to reduce the pressure loss coefficient and increase the discharge coefficient by shortening the cavitation length. The decrease in the cavitation length by the bump was explained by the strengthening of the re-entrant jet. The wake generated from the hemispherical bump seems to increase the adverse pressure gradient on the Venturi surface, thereby strengthening the re-entrant jet.

주제어

표/그림 (11)

그림 Fig. 1. Structure of the cavitation in Venturi
그림 Fig. 2. Schematic diagram of the experimental set-up for Venturi cavitation
그림 Fig. 3. Geometry of the Venturi with hemispherical bump: (a) Front view, (b) Top view.
그림 Fig. 4. Schematic diagram of the experimental set-up for the Venturi cavitation visualization
그림 Fig. 5. Variations in the (a) pressure loss coefficient and (b) discharge coefficient with the flow rate.
그림 Fig. 6. Instantaneous high-speed images ((a) front view and (b) top view) for the base model (top) and bump model (bottom) at Rethroat = 1.08×10⁵.
그림 Fig. 7. Standard deviation of normalized images for the (a) base model and (b) bump model at Rethroat = 1.08×10⁵.
그림 Fig. 8. Variation in the cavitation length with the Reynolds number on the (a) top and (b) bottom surfaces.
그림 Fig. 9. Development process of sheet cavitation in Venturi.
그림 Fig. 10. Instantaneous high-speed images for the (a) base model and (b) bump model at Re_throat = 1.08 × 10⁵.
그림 Fig. 11. Development of the re-entrant jet for the (a) base model and (b) bump model.

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