2 edition of Numerical modelling of flows in reed channel of air jet loom found in the catalog.
Numerical modelling of flows in reed channel of air jet loom
Jaroslav Pelant
Published
2001
by Information Centre for Aeronautics in Letnany, Czech Republic
.
Written in
Edition Notes
| Statement | by Jaroslav Pelant and Karel Adámek. |
| Series | Zprava VZLU = ARTI reports -- Z-74, Zpráva VZLÚ -- Z-74. |
| Contributions | Adámek, Karel., Information Centre for Aeronautics (Czech Republic), Výzkumný a Zkušební Letecký Ústav |
| The Physical Object | |
|---|---|
| Pagination | 21 p., [6] leaves of plates : |
| Number of Pages | 21 |
| ID Numbers | |
| Open Library | OL21502838M |
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AIR JET LOOMS. INTRODUCTION Air jet weaving is done on an air jet loom, which propels yarn called "weft" by using a jet of air. Weft yarn fills in the lengthwise pattern set down first by the "warp" yarn. Shuttle less Weaving Machines are generally of wider widths enabling the simultaneous weaving of two or more widths; up to / cms. in the case of Air Jet. The air-jet loom computer control system is a typical direct digital control (DDC) system. It has four layers: collection/execution, I/O channel, main control loom, and peripheral devices. The control board belongs to the main control loom and precisely runs all organization and fittings. This section describes.
6. factors affecting air consumption in air-jet loom Please Subscribe to my Channel and share with your Friends. Also give your views in comments RIFA New Model Air Jet Loom --RFJA Modeling and Analysis of Compressed Air Consumption of Air Jet Loom Dr. T S S Jayawardana #1, #Prof. E A S K Fernando 2, there is no waste of air through the reed dents. The Helix model equation was used to calculate the path results in increasing the velocity of air flow and it practically increased to a supersonic flow. Only.
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Air-jet weft insertion systems are currently used in all kinds of fibres and yarns. The weft is moved by the friction created by the high speed flow of the air jet loom.
The air jet force is required to move and accelerate the weft yarn. These forces should be higher than the inertia and by: 1. The flow field inside an air-jet loom main nozzle is studied numerically, by means of a two-dimensional model implemented in the commercial computational fluid dynamics (CFD) code Fluent.
An air-jet loom is a shuttleless loom that uses a jet of air to propel the weft yarn through the warp shed. It is one of two types of fluid-jet looms, the other being a water-jet loom, which was developed previously. Fluid-jet looms can operate at a faster speed than predecessor looms such as rapier looms, but they are not as common.
The machinery used in airjet weaving consists of a main. Numerical modelling the air flow in parts of air jet loom. Autorzy.
of two-dimensional (2D) numerically modelled expansion and flow of compressible and non-viscous gas in typical parts of air jet weaving system ; namely in main nozzle designed as an ejector with various shapes of the mixing zone, in relay (auxiliary) nozzle with substantial.
The air-jet loom is widely used in the textile industry. The interaction mechanism of airflow and yarn is not clear in such a narrow flow channel, the gas consumption is. The synthetic flow-field model of main and auxiliary nozzle flow-field in air-jet loom is introduced.
The software of computational fluid dynamics FLUENT is used for the first time to simulate synthetic flow-field, and velocity vector is analyzed. To different spray angles of auxiliary nozzle, the velocity and total pressure of central air are compared in brief. air consumption on the air jet loom was measured, according to combinations of different factor levels as given in Table II, using theTR air flow meter by TakayamaReed Company Limited, Japan.
All the experiments were conducted on a Picanol Omni-plus air jet loom, Model The loom was thoroughly checked for any air leakage before starting. The drawings illustrate a method and apparatus for enhancing air flow characteristics in an air jet loom reed broadly designated at The reed 10 has a tunnel 11 and a bottom channel The air jet loom reed is first removed from an air jet loom (not shown).
The air jet loom reed is then positioned in a mounting frame A in a fixed preferably. The air-jet loom is widely used in the textile industry. The interaction mechanism of airflow and yarn is not clear in such a narrow flow channel, the gas consumption is relatively large, the yarn motion is unstable and the weft insertion is often interrupted during the operation.
In order to study the characteristics of the semi-closed flow field in profiled dents, the momentum conservation. The air jet weaving machines require air ducts capable of maintaining an effective air flow on the whole weaving width.
To obtain this, the machine manufacturers prefer today to use the system with profiled reed, in which the air and the thread are guided through a tunnel-shaped reed. Air jet picking of very heavy wefts - modelling verification of hypothesis Pneumatic picking + beat-up (principle) Velocity field of picking phase (up) and transition phase between picking and beat-up (down) modelling of hypothesis Other applications of numerical flow modelling in textile machines / technologies Air flow in carding clothing.
Example: The loom produces heavy technical fabrics in a weaving width of 2,0 m and with a weaving frequency of 9 Hz. The weft insertion takes 50% of Keywords. air jet weaving, weft brake, technical cloths, numerical flow modelling.
A profile reed for an air jet loom includes a dent having a guide recess and a lower jaw portion located below the guide recess, and a weft yarn passage formed by a plurality of the dents juxtaposed in the direction of weft insertion.
The guide recess is formed with upper, inner lower wall surfaces. The inner wall surface is connected with the lower wall surface through a lower arcuate surface. KEYWORDS: Air jet loom, weft passage, profile reed, main nozzle, relay nozzle, weft insertion INTRODUCTION Intermittent weaving machines have the property that the weft is repeatedly laid into shed and tightened to the selvedge one after the other.
This procedure is. Air jet loom, main nozzle, profile reed, relay nozzle, weft insertion., weft passage: Összefoglalás: Abstract: The air jet looms are widespread in the textile industry because of their high productivity and versatility.
In air jet weaving the weft yarn is transported through the weft passage by means of flowing air. In this basic research for improving the performance of main nozzle of an air jet loom with a modified reed and auxiliary nozzles, the relation between the length of an acceleration tube and jet flow characteristics for 2∼6kgf/cm 2 tank pressures has been eamined within both subsonic and supersonic regions of jet speed.
Further, the weft drag force by the main nozzle has been measured. INTRODUCTIONAir jet weaving is done on an air jet loom, which propels yarn called "weft" by using a jet of air.
Weft yarn fills in the lengthwise pattern set down first by the "warp" yarn. Shuttle less Weaving Machinesare generally of wider widths enabling the simultaneousweaving of two or morewidths; up to / the case of Air Jet.
The yarn is carried through the shed by the air currents emitted by the relay nozzles on the channel. The initial propulsive force is provided by a main nozzle. Electronically controlled relay nozzles offer extra booster jets to hold the yarn across the shed.
The most effective breadth for air-jet weaving machines is regarding cm. All the turbulence models used show clearly the three characteristic zones of the air-jet but each of them present substantial differences due to the change of the non-viscous and subsonic layers. Download: Download full-size image; Fig.
Velocity field of the supersonic air jet after s for the different types of turbulence models. By Air Jet looms (assignment FM) submitted to Sir Zahid Khan Working by Shakir Ullah & Waqar Ameen Office Equipment’s Requirement Ser Details Qty. Per Unit Cost Total Cost 1 Computer core i3 5 20,2 Printer 2 8, 16, 3 Switch D-link Wifi 2 5, 10, 4 Air Conditioner 2 50,5 Telephone set 5 2, 12, Total.
Keywords: Air-jet loom, Air-yarn friction coefficient, Simulation model, Weft insertion, Weft yarn motion IPC Code: Int. Cl. 8 D03D 1 Introduction Air-jet weaving is an advanced weaving method with high efficiency and productivity. However, the weft yarn motion in air-jet filling insertion is very complicated.Dong, T-Z, Feng, Z-H, Wang, W-H.
Numerical simulation and experimental verification of weft insertion flow field of main nozzle in an air-jet loom (in Chinese).
J Text Res China ; – The air-jet loom is widely used in the textile industry and the main nozzle is one of its key components. In this paper, the influence of some parameters, including the input air pressure and the structure of nozzle core and its internal diameter, on the internal flow field of the main nozzle is analyzed.
