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에어 제트 직기의 메인 노즐 유동에 관한 수치해석적 연구
임채민(C.-M. Lim),이호준(H.-J. Lee),노석홍(S.-H. Noh),이권희(K.-H. Lee),김희동(H.-D. Kim),전두환(D.-H. Chun) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
An air jet loom as one of shuttleless looms transports a yarn into warps using viscosity and kinetic energy of an air jet. A performance of this picking system depends on the ability of instantaneous inhalation/exhaust, the configuration of nozzle, the operation characteristics of a check valve, and so on. In the recent past many studies have been reported on an air jet discharged from the nozzle exit, but studies for understanding of the flow field characteristics associated with shear layer, and shock wave and boundary layer interaction in the nozzle were not conducted enough. In this paper, computational study was performed to explain the flow field in the air jet nozzle with an acceleration tube of a very small divergent angle. The result obtained from computational study show that the flow field in the air jet nozzle depends on the nozzle configuration and the length of acceleration tube.
제직공정에서 바디침 속도를 고려한 위사밀도 동적거동 해석
허유,김종성,전두환,Huh You,Kim Jong S.,Chun D. H. 한국섬유공학회 2005 한국섬유공학회지 Vol.42 No.5
The visual quality of a fabric is directly connected with the fabric density, i.e., picks/em and ends/em, variations of which are influenced by the weaving process conditions. Any variation in the conditions during a weaving process can lead to a fabric flaw, which implies a deterioration of the fabric quality. The fault that appears frequently in weaving is the stop mark, the variation in fabric density, especially, weft picks per unit length. This research is to set up a model describing the pickspacing dynamics in the weaving process and to simulate the pickspacing changes under given initial conditions, considering the start-up velocity profiles. The results show that initial clothfell position is an important factor affecting the pickspacing unevenness. Thin and harsh-surfaced weft yarns are more sensitive to the pickspacing changes than the thick and even-surfaced, while a velocity profile for a restart, even not considering the dynamics of the machine parts, can bring about a stop mark, if the profile has a quadratic function form with respect to time.