Numerical simulation of the internal flow field of a new main nozzle in an air-jet loom based on Fluent

2015 ◽  
Vol 85 (15) ◽  
pp. 1590-1601 ◽  
Author(s):  
Liang Chen ◽  
Zhi-hua Feng ◽  
Teng-zhong Dong ◽  
Wei-hua Wang ◽  
Shuai Liu
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Internal Flow ◽  
Air Jet ◽  
Air Jet Loom

An investigation of some parameter effects on the internal flow characteristics in the main nozzle

2016 ◽  
Vol 87 (1) ◽  
pp. 91-101 ◽  
Author(s):  
Yuzhen Jin ◽  
Jingyu Cui ◽  
Linhang Zhu ◽  
Peifeng Lin ◽  
Xudong Hu
Keyword(s):  
Flow Field ◽  
Textile Industry ◽  
Great Influence ◽  
Flow Characteristics ◽  
Internal Flow ◽  
Air Pressure ◽  
Weft Yarn ◽  
Internal Diameter ◽  
Air Jet ◽  
Air Jet Loom

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. Then the optimized structure of the main nozzle is proposed from the perspective of fluid dynamics. In the present simulations, the realizable [Formula: see text] model is applied to model the internal flow field of the main nozzle. The results show that the velocity in the annular throat reaches supersonic. Moreover, the pressure at the end of the nozzle core is the lowest in the main nozzle. It is also shown that the input air pressure has little effect on the axis velocity in Zone B, but on the other hand, has a great influence on the near-wall velocity field and the axis velocity in Zone C. In addition, an optimized structure of the nozzle core is proposed in this paper. It is found that with the proposed structure, the velocity boundary layer near the wall of Zone B in the accelerating tube can be well improved, and rapid diffusion of airflow in this area can be avoided. These help increase the moving speed of the weft yarn. Last but not least, we also show that decreasing of the internal diameter of the nozzle core improves the axis velocity of the weft accelerating tube. However, it brings a stronger turbulence at the same time.

Numerical Simulation and Analysis for the Flow Field of the Main Nozzle in an Air-Jet Loom Based on FLUENT

2011 ◽  
Vol 105-107 ◽  
pp. 172-175 ◽  
Author(s):  
Ding Ding Liu ◽  
Zhi Hua Feng ◽  
Bao Hui Tan ◽  
Yin Ping Tang
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
High Speed ◽  
Static Pressure ◽  
Structural Parameters ◽  
Parameters Optimization ◽  
Airflow Velocity ◽  
Air Jet ◽  
Flow Field Characteristics ◽  
Air Jet Loom

Due to the complicated structure and the high speed turbulence, it is difficult to measure and analyze the flow field characteristics of the main nozzle by experimental methods, naturally, some software such as FLUENT become a powerful tool to perform the numerical simulation for flow field of the main nozzle of an air-jet loom. The distribution of the airflow velocity and static pressure along axial and radial direction in main nozzle were investigated. The results indicated that the airflow in the main nozzle was extremely complex, its velocity in throat could be sonic and a certain backflow was produced. The research results will play an important role on the structural parameters optimization and energy conservation.

Numerical simulation of three-dimensional airflow in a novel dual-feed rotor spinning box

2016 ◽  
Vol 88 (3) ◽  
pp. 237-253 ◽  
Author(s):  
Nicholus Tayari Akankwasa ◽  
Huiting Lin ◽  
Yuze Zhang ◽  
Jun Wang
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Three Dimensional ◽  
Internal Flow ◽  
Velocity Variation ◽  
Positive Pressure ◽  
Three Dimensional Model ◽  
Air Velocity ◽  
Rotor Spinning ◽  
Pressure Profiles

In order to regulate turbulence strength and determine airflow characteristics in a new dual-feed rotor spinning unit, the internal flow field is investigated. A computational fluid dynamics technique is employed to numerically study the three-dimensional model of the internal airflow in the new design. The effects of air velocity variation on turbulence strength, negative pressure, Re, and wall pressure distribution are investigated based on simulation data and previous studies. The results show that the turbulence strength and Re increased with increase in inlet air velocity. Pressure profiles inside the rotor varied significantly with positive pressure observed at the channel exits. Minimal inlet velocity maintains the flow field in the rotor interior below 100 m/s, which gives the ideal turbulence required to minimize yarn quality deterioration. The dual-feed rotor spinning unit showed more orderly streamline patterns with fewer vortices compared to the conventional one. The numerical simulation can provide insights on airflow studies and some guidelines for future prototyping and experiments to further improve the new design.

Synthetic Flow-Field Analysis of Main and Auxiliary Nozzles in Air-Jet Looms

2011 ◽  
Vol 411 ◽  
pp. 16-20 ◽  
Author(s):  
Shuan Jun Song ◽  
Dan Feng Shen
Keyword(s):  
Flow Field ◽  
Total Pressure ◽  
Field Model ◽  
Field Analysis ◽  
Comparison Analysis ◽  
Air Jet ◽  
Before And After ◽  
Flow Field Analysis ◽  
Air Jet Loom ◽  
First Time

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. The boundary conditions are changed by User Defined Functions (UDF) and the comparison analysis is done before and after using UDF.

Numerical Simulation of Interior Flow Field of Reactor Coolant Pump under Station Blackout Accident

2012 ◽  
Vol 455-456 ◽  
pp. 1002-1008 ◽  
Author(s):  
Yi Ming Xu ◽  
Shi Ming Xu
Keyword(s):  
Numerical Simulation ◽  
Flow Field ◽  
Internal Flow ◽  
Simulation Method ◽  
Governing Equations ◽  
Coolant Pump ◽  
Reactor Coolant ◽  
Internal Characteristic ◽  
Station Blackout ◽  
Interior Flow

Numerical simulation is used for researching the transient characteristic and internal characteristic of the reactor coolant pump under station blackout accident. The simulation method has been presented by analyzing difference scheme for governing equations. The analytical model of reactor coolant pump flow field has been established by analyzing adequately the influence of varying rotation speed to the pump external characteristic. Finally, the pump internal flow characteristic is exposed.

scholarly journals Numerical Simulation of Flow Field in Air-Jet Loom Main Nozzle

2019 ◽  
Vol 19 (2) ◽  
pp. 181-190
Author(s):  
Shanshan He ◽  
Yi Qian ◽  
Wenliang Xue ◽  
Longdi Cheng
Keyword(s):  
Flow Field ◽  
Negative Pressure ◽  
Fluid Dynamic ◽  
Air Drag ◽  
Zone Length ◽  
Air Jet ◽  
Pressure Zone ◽  
Nozzle Exit Velocity ◽  
Air Jet Loom ◽  
Nozzle Structure

Abstract To improve airflow injection capacity of the main nozzle and decrease backflow phenomenon, a new main nozzle structure with two throats is designed. Negative pressure value and negative pressure zone length are first proposed evaluating the strength of backflow phenomenon. Commercial computational fluid dynamic (CFD) code “Fluent” is performed to simulate the flow field inside and outside the main nozzle. Exit velocity increases about 10 m/s in new main nozzle. Airflow core length of the new main nozzle is 35% higher than that of commonly used main nozzle. Smaller negative pressure value and shorter negative pressure zone length mean a weaker backflow phenomenon in the new main nozzle. Bigger air drag force indicates stronger weft insertion ability in the new main nozzle.

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