대형 캐비테이션터널에서 몰수체 저항시험 및 위벽효과 수정 기법 연구

Abstract

In order to study the resistance test technique for the submerged body in Large Cavitation Tunnel (LCT), DARPA Suboff, released submarine model was manufactured. DTRC released the resistance test data of DARPA Suboff conducted up to ship speed 18.0knots in high-speed towing tank in 1990. As LCT is restricted waterways with walls, the resistance test results must be corrected with 3 wall blockage effects called buoyancy effect, solid blockage effect and wake blockage effect. Before correction, the resistance of LCT was 17~20% higher than that of DTRC. After correction, the resistance and the resistance coefficients were compared with those of DTRC. The corrected resistance of LCT shows good agreement with that of DTRC. The residual resistance coefficient shows the difference according to the calculation method of buoyance and frictional resistance coefficient. This paper suggests the best way for the calculation of residual resistance coefficient, On the basis of the present study, it is thought that the operating conditions for the propeller cavitation and noise tests can be drawn through the LCT tests.