정상유동 장치에서 유동 특성 평가 방법에 대한 연구(1) - 문제의 제기

This paper is the first investigation on the evaluation methods of flow characteristics in the steady bench.
For this purpose, several assumptions used in the steady flow evaluation are examined, comparing the measured and/orprocessed results by the conventional impulse swirl meter with the ones by the real velocity through a particle imagevelocimetry. The results show that the most questionable assumption is the solid rotation of swirl. With regard to thisassumption, the flow characteristics by the conventional methods are distorted seriously by both of the eccentricity ofthe swirl center and non-uniform velocity profile along the cylinder radial direction. In addition, the cylinder axialvelocity distribution also has the great effect on the flow characteristics.