예인수조용 스테레오스코픽 입자영상유속계 시스템의 불확실성 해석

• Published in: 大韓造船學會 論文集 Vol. 51; no. 4; pp. 311 - 320
• Main Authors: 서정화(Jeonghwa Seo), 설동명(Dong Myung Seol), 한범우(Bum Woo Han), 유극상(Geuksang Yoo), 임태구(Tae Gu Lim), 박성택(Seong Taek Park), 이신형(Shin Hyung Rhee)
• Format: Journal Article
• Language: Korean
• Published: 대한조선학회 2014
• Subjects: Towing tank test(예인수조 시험); Particle image velocimetry(입자영상유속계); Test uncertainty(실험 불확실성); Turbulent flow(난류 유동)
• ISSN: 1225-1143; 2287-7355

Test uncertainty of a towed underwater Stereoscopic Particle Image Velocimetry (SPIV) system was assessed in a towing tank. To estimate the systematic error and random error of mean velocity and turbulence properties measurement, velocity field of uniform flow was measured. Total uncertainty of the axial component of mean velocity was 1.45% of the uniform flow speed and total uncertainty of turbulence properties was 3.03%. Besides, variation of particle displacement was applied to identify the change of error distribution. In results for variation of particle displacement, the error rapidly increases with particle movement under one pixel. In addition, a nominal wake of a model ship was measured and compared with existing experimental data by five-hole Pitot tubes, Pitot-static tube, and hot wire anemometer. For mean velocity, small local vortex was identified with high spatial resolution of SPIV, but has serious disagreement in local maxima of turbulence properties due to limited sampling rate.