高效率空氣噴嘴流場之數值研究

Numerical Study on Internal Flow Field of High Efficiency Air Jet Nozzle

吳文欽(Wen-Chin Wu)

指導教授 ： 趙修武

中原大學/工學院/機械工程研究所/碩士(2004年)

https://doi.org/10.6840/cycu200400529

摘要

空氣噴嘴乃紡織工業中的絲加工技術之關鍵零組件。全球紡織工業中，許多大型的廠商仍然握有大多數絲加工技術關鍵零組件之專利權。本研究之目的在於藉由解析空氣噴嘴內部之流場特性，建立空氣噴嘴內流場特性與幾何外形之相關系統資料，以便能提供空氣噴嘴設計與開發上的參考，期盼能夠在空氣噴嘴設計與開發過程中，節省因經驗試誤所造成之成本與時間的浪費，進而能夠提昇我國紡織產業絲加工之技術。
本研究之目的為將空氣噴嘴之內流場特性做完整之研究分析，並將紗支在空氣噴嘴內之集束作用建立定量關係，其中包括(一) 建立高效率空氣噴嘴內流場之網格。使用網格製作軟體來製作高效率空氣噴嘴內部流道之網格模型。(二) 建立高效率空氣噴嘴內流場之分析模式，利用計算流體力學分析軟體，以平行計算方式，來分析空氣噴嘴內部之高壓空氣流場特性，以做為基本的參考模型，進而供做進一步分析時的基礎。 (三) 分析高效率空氣噴嘴內流場特性與紗支結數特性之關係。本研究成果經與試驗結果比對，可提供空氣噴嘴對紗支集束結數之準確估算。

關鍵字

數值模擬 ； 可壓縮流流場 ； 計算流體力學

並列摘要

In order to obtain the key technology of filament texturing, the ability of designing high-efficiency air interlacing apparatus becomes very important. Because the air jet interlacing apparatus is actuated through high-pressure air flowing through yarn passages, the flow characteristics inside the passages dominate the behaviors of the interlacing process.
This thesis is to study the flow field inside the passages numerically and to correlate the flow characteristics with the interlacing characteristics of interlacing apparatus. The first step is to create the numerical grids describing the exact geometry of the passages. Second, the computational fluid dynamics tools are used to investigate the flow field inside the apparatus. Third, the important flow characteristic, e.g. vortices, is quantitatively studied. A model correlating the flow vorticity strength and the knot number is proposed. The proposed relation is proven to be capable of predicting the knots per unit interlacing length with accepted accuracy.

並列關鍵字

Compressible flow ； Computational Fluid Dynamics. ； Numerical simulation

參考文獻

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[1] Ceramic Yarn & Cable Guide 2001, Bell New Ceramics Co., LTD.

[2] S. T. Price, “Air Jet for Interlacing Multifilament Yarn,” U.S. Patent Documents, No. 4245378, 1981.