Browse > Article
http://dx.doi.org/10.5407/jksv.2021.19.3.136

Visualization of Vortex Flow around Coolant Outlets Using PIV and LDV  

Hong, Ji-Woo (Department of Naval Architect and Ocean Engineering, Chungnam National University)
Shin, Su-Yong (Structure/Vibration & Noise, R&D Department, Daewoo Shipbuilding and Marine Engineering)
Ahn, Byoung-Kwon (Department of Naval Architect and Ocean Engineering, Chungnam National University)
Publication Information
Journal of the Korean Society of Visualization / v.19, no.3, 2021 , pp. 136-142 More about this Journal
Abstract
Submerged and semi-submerged vehicles expel cooling water through an outlet. In this process, induced noise and vibration by the flow around the outlet have been reported, and it may cause problems directly related to survivability of the navy vessels. The coolant outlet has a net-type structure and circular columns are mostly used. In this study, flow measurements using PIV and LDV were performed for different type outlets; conventional (flat plate with round bar) and improved (flat and flat plate) configurations. Experiments were conducted at a cavitation tunnel where pressure and steady flow rate conditions are ensured for sufficient time to measure the flow. The average velocity field of the outlets were measured and compared through LDV measurements, and instantaneous vorticities were evaluated through PIV measurements. The results show that the improved type of the outlet is advantageous in terms of flow stability compared to the conventional type of the outlet.
Keywords
Flow Visualization; PIV; LDV; Vortex; Coolant outlet; Shedding frequency;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 Jesse H. S. and Raymond W. F., 2017, "Requirements for Reducing Underwater Noise From Ships," IEEE JOURNAL OF OCEANIC ENGINEERING, Vol. 42(2), pp.388~398.   DOI
2 Nicholas M., Roy R. A. and Crum L. A., 1994, "Sound emissions by a laboratory bubble cloud," The Journal of the Acoustical Society of America, Vol. 95(6), pp.3171~3182.   DOI
3 Rajani B. H., Kandasamy A. and Majumdar S., 2016, "LES of Flow past Circular Cylinder at Re = 3900," Journal of Applied Fluid Mechanics, Vol. 9(3), pp.1421~1435.   DOI
4 Lee J. Y. and Lee S. J., 2010, "Experimental Analysis of Flow Characteristics around Wind-Turbine Blades," Journal of the Korean Society of Visualization, Vol. 7(2), pp.64~71.   DOI
5 Blevins, R. D., 1977, Flow-induced vibration. New York.
6 Kim H. S., Kang H. J., Kim B. Ki. and Kim S. R., 2007, "A Study on Structure-Borne Noise Reduction for Resiliently Mounted Pumps for Ship," Journal of the Society of Naval Architects of Korea, Vol. 44(5), pp.488~495.   DOI
7 Weichao S., Mehmet A., Roslynna R., Batuhan A. and Rosemary N., 2016, "Cavitation observations and noise measurements of horizontal axis tidal turbines with biomimetic blade leading-edge designs," Ocean Engineering, Vol. 121, pp.143-155.   DOI
8 Kim J. H., Chae S. B. and Kim J. H., 2020, "Flow around a circular cylinder with axially arranged holes," Journal of the Korean Society of Visualization, Vol. 18(1), pp.59~66.
9 Jeong S. W. and Ahn B. K., 2016, "An Experimental Study on Wake Cavity Flow Characteristics of Two-dimensional Wedge Shaped Control Fins," Journal of the Society of Naval Architects of Korea, Vol. 53(3), pp.180~187.   DOI