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3차원 입자 속도 측정을 위한 홀로그래피 시스템의 분무에의 적용
오대진(Dai-Jin Oh),추연준(Yeon-Jun Choo),강보선(Bo-Seon Kang) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
The Holographic Particle Velocimetry system can be a promising optical tool for the measurements of three dimensional particle velocities. In this study, the holographic particle velocimetry system was used to measure the sizes and velocities of droplets formed by a commercial full cone spray nozzle. Uncertainty analysis was performed to identify the sources of all relevant errors and to evaluate their magnitude. The droplet velocities ranged from 10.3 to 13.3 m/s with average uncertainty of ±1.6 m/s, which is ±14 % of the mean droplet velocity. Compared with relatively small uncertainties of velocity components in the normal direction to the optical axis, the uncertainty of the optical axis component is ±3.6 m/s. This is due to the long depth of field of droplet images in the optical axis, which is an inherent feature of holographic system using forward-scattering object wave of particles.
강보선 ( Bo Seon Kang ),추연준 ( Yeon Jun Choo ),오대진 ( Dai Jin Oh ) 한국분무공학회 2001 한국액체미립화학회지 Vol.6 No.2
In this study, the velocity characteristics of liquid elements formed by two impinging jets is analysed using double pulse image capturing technique. For the droplets formed by low speed impinging jets, the droplet velocities are higher with smaller azimuthal and impingement angle. The maximum droplet velocities are about 25 % lower than jet velocity. With an increase of azimuthal angle, the shedding angles increases but remains lower than azimuthal angle. The velocities of ligaments formed by high speed impinging jets gradually decreases with an increase of azimuthal angle. The maximum ligament velocities are about 40 % lower than jet velocity. Higher impingement angles produce lower ligament velocities. The shedding angles of ligament almost increases with the same value of azimuthal angle, which implies that the moving direction of ligaments is radial from the origin as the impingement point.