예인수조용 스테레오스코픽 입자영상유속계 시스템의불확실성 해석
Uncertainty Assessment of a Towed Underwater Stereoscopic PIV System
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초록
Test uncertainty of a towed underwater Stereoscopic Particle Image Velocimetry (SPIV) system was assessed in a towing tank. Toestimate the systematic error and random error of mean velocity and turbulence properties measurement, velocity field of uniform flowwas measured. Total uncertainty of the axial component of mean velocity was 1.45% of the uniform flow speed and total uncertainty ofturbulence properties was 3.03%. Besides, variation of particle displacement was applied to identify the change of error distribution. Inresults for variation of particle displacement, the error rapidly increases with particle movement under one pixel. In addition, a nominalwake of a model ship was measured and compared with existing experimental data by five-hole Pitot tubes, Pitot-static tube, and hotwire anemometer. For mean velocity, small local vortex was identified with high spatial resolution of SPIV, but has serious disagreementin local maxima of turbulence properties due to limited sampling rate.
Abstract
Test uncertainty of a towed underwater Stereoscopic Particle Image Velocimetry (SPIV) system was assessed in a towing tank. Toestimate the systematic error and random error of mean velocity and turbulence properties measurement, velocity field of uniform flowwas measured. Total uncertainty of the axial component of mean velocity was 1.45% of the uniform flow speed and total uncertainty ofturbulence properties was 3.03%. Besides, variation of particle displacement was applied to identify the change of error distribution. Inresults for variation of particle displacement, the error rapidly increases with particle movement under one pixel. In addition, a nominalwake of a model ship was measured and compared with existing experimental data by five-hole Pitot tubes, Pitot-static tube, and hotwire anemometer. For mean velocity, small local vortex was identified with high spatial resolution of SPIV, but has serious disagreementin local maxima of turbulence properties due to limited sampling rate.
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