以無黏性可壓縮流數值計算分析空氣加工絲集束特性研究

Study on Texturing Characteristics of Air-Jet Texturing Yarn via a Numerical Approach Based on Inviscid Compressible Flow Computations

闕千翔(Chien-Hsiang Cheuh)

指導教授 ： 趙修武

中原大學/工學院/機械工程研究所/碩士(2006年)

https://doi.org/10.6840/cycu200600505

摘要

本文為利用流體力學方法模擬ATY噴嘴內部流場，以求解連續方程式、動量方程式與能量方程式來解析三維穩態非黏性可壓縮流場，進行不同外型之ATY噴嘴內部流場特性分析，探討空氣加工絲集束的特性。由於空氣加工絲的集束特性主要由流場軸向與切向速度分量決定，本文發現噴嘴內部各特徵區段之流場無因次化交織係數與空氣加工絲張力值和張力變異值有密切的關係，而交織係數可由平均渦度、平均軸向速度與特徵長度加以定義。經由與實驗結果比較，本文建立一估算空氣加工絲特性的方法，該方法具有相當之精確性。

關鍵字

CFD計算 ； 集束特性 ； 空氣加工絲 ； 交織係數 ； ATY噴嘴

並列摘要

This paper employs the methods of computational fluid dynamics to simulate the internal flow field of ATY nozzles to analyze the texturing characteristics of different air-jet texturing yarn nozzles. The inviscid compressible flow field inside ATY nozzles is calculated by solving the continuity equation, momentum equation and energy equation. Because the texturing process mainly depends on axial and tangential velocity components, the texturing properties of yarn are determined by a dimensionless coefficient, the texturability, which is defined by the mean vorticity, mean axial velocity and the characteristic length of channel. With the help of measurements, we reified a new quantitative relationship between the texturability and the texturing characteristics, which is proven to have high prediction accuracy.

並列關鍵字

CFD computation ； ATY nozzle ； texturing coefficient ； air-jet texturing yarn ； texturing characteristics