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research-article

Dynamic Behaviors of Re-entrant Jet and Cavity Shedding During Transitional Cavity Oscillation on NACA0015 Hydrofoil

[+] Author and Article Information
Bangxiang Che

Institute of Process Equipment, Zhejiang University, Hangzhou, 310027, China
chebx_zju@zju.edu.cn

Linlin Cao

Institute of Process Equipment, Zhejiang University, Hangzhou, 310027, China
caolinlin@zju.edu.cn

Ning Chu

Institute of Process Equipment, Zhejiang University, Hangzhou, 310027, China
chuning@zju.edu.cn

Dmitriy Likhachev

Institute of Process Equipment, Zhejiang University, Hangzhou, 310027, China
2438757704@qq.com

Dazhuan Wu

Institute of Process Equipment, Zhejiang University, Hangzhou, 310027, China
wudazhuan@zju.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4041716 History: Received February 11, 2018; Revised October 05, 2018

Abstract

Transitional cavity shedding is known as the stage of attached cavitation with high instability and distinct periodicity. In this study, we experimentally investigated the dynamic characteristics of transitional cavity (0.8=L/c<1) shedding on NACA0015 hydrofoil with high-speed video observation and pressure measurement synchronously. In the partial cavity (0.4<L/c<0.8) oscillation, the sheet cavitation grew along the chord with good spanwise uniformity, and the middle-entrant jet played a dominant role in cavity shedding. Meanwhile, in the transitional cavity oscillation, the previous shedding cavity exhibited a prohibitive effect on the growth of sheet cavitation on the hydrofoil, resulting in concave cavity closure line. Moreover, two symmetrical side-entrant jets originated at the near-wall ends and induced the two-stage shedding phenomenon. The aft and fore parts of the sheet cavitation shed separated as different forms and eventually merged into the large-scale cloud cavity.

Copyright (c) 2018 by ASME
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