Numerical Simulation of Airflow Characteristics in Air Suction Gun

Li, Yonggui; Iemoto, Yoshiyuki; Tanoue, Shuichi; Takasu, Satoshi

doi:10.4188/jte.56.97

Cited by 8 publications

(17 citation statements)

References 16 publications

(21 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…4. It is similar to the streamline of the compressed air injected into the yarn propulsion tube as presented in our previous paper [3]. Such airflow causes the entrained yarn to possess an axial component of motion directing towards the rear of the straight tube, as well as a circumferential component of motion along the wall of the yarn propulsion tube.…”

Section: Resultssupporting

confidence: 74%

“…6(a) caused by the unsteady weak helical airflow in the straight tube downstream. The quite large gradients of p y in the de Laval tube are generated because the air velocity drops rapidly owing to the normal shock wave in the de Laval tube [3].…”

Section: Effect Of Compressed-air Inflow Angle F On Yarn Posturementioning

confidence: 99%

“…Furthermore, we have clarified the working mechanism by investigating the characteristics of airflow in a gun and the dependence of flow patterns on the supplied air pressure [3] and the geometry of the gun [4] by numerical simulation.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Yarn Posture in an Air Suction Gun

Iemoto

Tanoue

et al. 2010

J. Text. Eng.

Self Cite

View full text Add to dashboard Cite

The geometrical effects of an air suction gun on yarn motion were clarified by measuring postures of a running yarn with a still camera in order to promote the suction performance by controlling the yarn motion appropriately. The relation between the yarn posture and yarn suction force was also discussed. The yarn posture is a helix. This helical motion greatly improves the suction efficiency of the air suction gun owing to high concentration of air drag on the yarn. Helix diameter of yarn posture dy and helix pitch of yarn posture py decrease with an increase in the compressed-air inflow angle and a decrease in the throat diameter of de Laval tube, and are almost independent of the passage diverging angle of nozzle and the converging angle of de Laval tube. Unfavorable values of the geometrical parameters cause large fluctuations in yarn postures, i.e. violent yarn motion. A stable yarn posture with appropriately small dy decreases the friction between the yarn and the wall of tube, and an appropriately small py increases the contact area between the yarn and the air. Hence the yarn suction force is promoted.

show abstract

Section: Resultssupporting

confidence: 74%

Section: Effect Of Compressed-air Inflow Angle F On Yarn Posturementioning

confidence: 99%

See 1 more Smart Citation

Yarn Posture in an Air Suction Gun

Iemoto

Tanoue

et al. 2010

J. Text. Eng.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Thus, this airflow was assumed to be adiabatic flow. Calculating and simulating the fluid distribution using this method possess superior accuracy, and the simulation results were basically consistent with experimental result [7][8].…”

Section: Numerical Simulation Methodssupporting

confidence: 72%

“…systematically studied the influence of the main structural parameters of FDY yarn suction gun on yarn suction efficiency [6], flow field [7,8] and the yarn movement [9,10]. Li etc.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation Analysis of Influence of Jet Orifice Structure on Fluid Field in Yarn Suction Gun for Fully Drawn Yarn

Li¹,

Wei²,

Ke³

2017

JTEFT

Self Cite

View full text Add to dashboard Cite

Software CFX 12.1 was employed to conduct simulation of the fluid field inside yarn suction guns that possess different jet orifice structures and the relation between fluid field distribution and yarn suction performance was analyzed. The effect mechanism of jet orifice structure on properties of yarn suction gun was clarified, achieving reasonable structural parameters: orifice number N was 3, orifice diameter d was 2.0 mm, and orifice angle was 75˚. The results indicated that increment of jet orifice number led to the increase of free diffusion of ejected airflow and enhancement of directivity, meanwhile, the air density near tube wall inside the gun and the circumferential velocity component of air were improved, thereby the yarn suction force was increased. The conflict among ejected airflows was increased by the superabundant jet orifice number, leading to the decreased yarn suction force. Reasonable orifice diameter was beneficial to the formation of strong swirling flow, and can prevent the occurrence of normal shock, resulting in the increased yarn suction force. The angle of jet orifice mainly controlled the circumferential velocity component value of air that causing the change of swirling flow strength thus changed the yarn suction force. The yarn suction efficiency was closely relative to the distribution of airflow; especially the influence of the circumferential velocity component of air was the most significant. The occurrence of normal shock was not beneficial to the enhancement of yarn suction force, which should be avoided as much as possible.

show abstract