Dynamics Analysis and Testing of Transonic Flows in Main Nozzle of an Air-Jet Loom

2012 ◽  
Vol 197 ◽  
pp. 221-228
Author(s):  
Dan Feng Shen ◽  
Hui Zhao
Keyword(s):  
Fluid Dynamics ◽  
Dynamics Analysis ◽  
Airflow Velocity ◽  
Transonic Flows ◽  
Pull Force ◽  
Air Jet ◽  
Main Development ◽  
Air Jet Loom ◽  
Good Agreement

On the basis of fluid dynamics, this paper deduced the pull force formula of main nozzle on air-jet loom and introduces a method of experiment to test the airflow velocity in the exit of nozzle. The effect of different parameter structure of main nozzle on the pull force had been studied. It was observed that the inlet of thread tube was a bottleneck of main nozzle and the main development of main nozzle lengthens the thread tube. The theoretical findings were found to be in good agreement with experiment finding and this verified that the formula for pull force was reasonable.

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.

Study on Manufacturing Tolerances for the Laminar Airfoil

2015 ◽  
Author(s):  
Jaehun Lee ◽  
Kyoung Jin Jung
Keyword(s):  
Fluid Dynamics ◽  
Experimental Data ◽  
Computational Fluid Dynamics ◽  
Transition Model ◽  
Dynamics Analysis ◽  
Cfd Analysis ◽  
Computational Fluid Dynamics Analysis ◽  
Manufacturing Tolerances ◽  
Forward Facing Step ◽  
Good Agreement

The procedure to determine manufacturing tolerances for the laminar airfoil is explained using the CFD (computational fluid dynamics) analysis. This procedure is applied to a laminar airfoil for the tolerance of the forward-facing step and rearward-facing step. In the CFD analysis the Langtry-Menter SST Transition model is used to simulate a natural transition over the laminar airfoil. The computed tolerances showed good agreement with experimental data.

Simulation of air flow–yarn interaction inside the main nozzle of an air jet loom

2017 ◽  
Vol 88 (10) ◽  
pp. 1173-1183 ◽  
Author(s):  
Akil Osman ◽  
Benny Malengier ◽  
Simon De Meulemeester ◽  
Jozef Peeters ◽  
Jan Vierendeels ◽  
...  
Keyword(s):  
Air Flow ◽  
Three Dimensional ◽  
Weft Yarn ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Air Jet ◽  
A Chain ◽  
Air Jet Loom ◽  
Insertion Process ◽  
Good Agreement

The main nozzle of an air jet loom plays an essential role in the weft insertion process. This role involves sucking the weft yarn from the prewinder and launching it into the reed. Simulating the dynamic behavior of the weft yarn inside the main nozzle involves fluid–structure interaction (FSI). In this work, one-way and two-way FSI simulations of air flow–yarn interaction inside a main nozzle have been performed. A three-dimensional model of the flexible weft yarn, consisting of a chain of line segments, and a two-dimensional axisymmetric model of the supersonic flow have been developed and coupled to perform these simulations. The results of the simulations are compared quantitatively and qualitatively with experimental results. Good agreement has been found between the results of the two-way FSI simulations and the experiment. The coupled fluid and structure models provide an effective numerical tool to optimize the geometry of the main nozzle based on the calculated motion and speed of the weft yarn.

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