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http://dx.doi.org/10.3744/SNAK.2021.58.1.024

An Experimental Study on Multi-Injected Artificial Supercavitation  

Ahn, Byoung-Kwon (Department of Naval Architecture and Ocean Engineering, Chungnam National University)
Kim, Ki-Seong (Department of Naval Architecture and Ocean Engineering, Chungnam National University)
Jeong, So-Won (Korea Research Institute of Ship and Ocean Engineering)
Yoon, Hyun-Gull (Agency for Defense Development)
Publication Information
Journal of the Society of Naval Architects of Korea / v.58, no.1, 2021 , pp. 24-31 More about this Journal
Abstract
In this study, we present experimental observations of artificial supercavitation generated by the injection of compressed air at multiple locations on the body. Experiments were conducted at a cavitation tunnel equipped with a special facility to remove injected air before returning to the test section. Artificial supercavitation, which is generated at a relatively low speed compared to natural supercavitation, is formed asymmetrically on the axis of the body due to the buoyancy effect. In order to accelerate the development of the supercavity and increase the area covering the body, an experimental device capable of additional injection from the body was designed and its performance was evaluated through the model test. The shapes of the supercavity generated by multi-injections of different combinations according to different flow speeds were analyzed using high-speed shadow images. The results show that multiple injections at suitable locations can effectively increase the length of the supercavity and consequently improve propulsion efficiency.
Keywords
Cavitation; Cavitator; Natural supercavitation; Artificial supercavitation; Underwater vehicle; Multi-injection;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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1 Ahn, B.K. et al., 2015. Experimental study on artificial supercavitation of the high speed torpedo. Journal of the KIMST, 18(3), pp.300-308.
2 Ahn, B.K. et al., 2017. An experimental investigation of artificial supercavitation generated by air injection behind disk-shaped cavitators. International Journal of Naval Architecture and Ocean Engineering, 9(2), pp.227-237.   DOI
3 Jiang, Y., et al., 2019. Experimental investigation of drag characteristics of ventilated supercavitating vehicles with different body shapes. Physics of Fluids, 31, 052106.   DOI
4 Jeong, S.W., Park, S.T., & Ahn, B.K., 2018. Experimental investigation of artificial supercavitation under periodic gust flows. Journal of the KIMST, 18(3), pp.300-308.
5 Jeong, S.W., Park, S.T., & Ahn, B.K., 2019. An experimental study on artificial supercavitation generated by different combinations of the cavitator and body. Journal of the Society of Naval Architects of Korea, 56(4), pp.327-334.   DOI
6 Kim, J.H., Jang, H.K., Ahn, B.K. & Lee, C.S., 2013. A numerical analysis of the supercavitating flow around three-dimensional axisymmetric cavitators. Journal of the Society of Naval Architects of Korea, 50(3), pp.160-166.   DOI
7 Kim, J.H., Jeong, S.W., Ahn, B.K. & Jeon, Y.H., 2016. A study on natural supercavitation and drag characteristics of axisymmetric cavitors. Journal of the Society of Naval Architects of Korea, 53(6), pp.465-472.   DOI
8 Shao, S. et al., 2017. A comparative study of natural and ventilated supercavitation across two closed-wall water tunnel facilities. Experimental Thermal and Fluid Science, 88, pp.519-529.   DOI