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Tests on Ventilation Control of PRAIRIE for Improving Acoustic Stealth Performance

음향스텔스 성능 향상을 위한 PRAIRIE 공기 분사량 제어 실험

  • Lee, Heechang (Maritime Technology Research Institute, Agency for Defense Development) ;
  • Moon, Youngsun (Maritime Technology Research Institute, Agency for Defense Development) ;
  • Kang, Seunghee (Maritime Technology Research Institute, Agency for Defense Development)
  • 이희창 (국방과학연구소 해양기술연구원) ;
  • 문영선 (국방과학연구소 해양기술연구원) ;
  • 강승희 (국방과학연구소 해양기술연구원)
  • Received : 2020.06.29
  • Accepted : 2020.09.25
  • Published : 2020.12.05

Abstract

PRAIRIE(Propeller Air Induced Emission) system is a kind of underwater radiated noise suppression systems to reduce the probability of the identification or classification of our warship's acoustic signature by an enemy ship. It is effective in case of strong cavitation events. This is because air bubbles emitted from the PRAIRIE system mitigate drastic collapses of the cavity bubbles that can generate an intense shock wave. However, when the PRAIRIE system is operated in a non or weak cavitation condition, it might increase the total level of underwater radiated noise and induce the acoustic signatures. Therefore, this paper presents the trial results on ventilation control of PRAIRIE to find a more efficient operation depend on the cavitation condition. Then, we show a variation of the amplitude modulation characteristics according to ventilation control.