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J. KIMS Technol > Volume 20(6); 2017 > Article
Journal of the Korea Institute of Military Science and Technology 2017;20(6):767-773.
DOI: https://doi.org/10.9766/KIMST.2017.20.6.767   
An Experimental Study on the Dispersion Characteristics of Seawater Injection Nozzle for Hull Cooling
Seoktae Yoon, Hoseok Jung, Yongjin Cho
1Ship Infra-Red Signature Research Center, Dongeui University
2Department of Naval Architecture and Ocean Engineering, Dongeui University
선체냉각을 위한 해수분사노즐의 산포특성에 관한 실험 연구
윤석태, 정호석, 조용진
1동의대학교 함정적외선신호연구소
2동의대학교 조선해양공학과
Infrared stealth is an important technology for naval ships. This technology helps improve the anti-detection performance and survivability of naval ships. In general, the infrared signature of naval ships are categorized into internal and external heat source. External signature are generated by ship surface heating by solar flux as well as the complicated heat transfer process with the surrounding weather condition. Modern naval ships are equipped with seawater injection nozzles on the outside for nuclear, biological and, chemical, and these nozzles are used to control external signature. Wide nozzle placement intervals and insufficient injection pressure, however, have reduced seawater dispersion area. To address this problem, nozzle installation standards must be established. In this study, an actual-scale experimental system was implemented to provide the evidence for nozzle installation standards in order to reduce the infrared signature of naval ships. In addition, the environmental conditions of the experiment were set up through computational fluid dynamics considering the ocean climate data and naval ship management conditions of South Korea. The dispersion distance was measured using a high-resolution thermography system. The flow rate, pipe pressure, and dispersion distance were analyzed, and the evidence for the installation of seawater injection nozzles and operation performance standards was suggested.
Key Words: Active Hull Cooling System, Computational Fluid Dynamics, Infra-Red Stealth, Ocean Climate Data, Seawater Injection Nozzle


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