3-D Stimulation And Analysis Of Weft Insertion Flow Of Main Nozzle In An Air Jet Loom

CFD (Computational Fluid Dynamics) is used to analyze the whole 3-D weft insertion flow of main nozzle of a air-jet loom in this dissertation. A better combination of parameters will be given after the simulation of main nozzles with different parameters and comparing their advantages and disadvantages in order to guide manufacture and save manpower, material and money. This desertation is consisted of some researches as bellow.1. The process of main nozzle's weft insertion flow, the structure of main nozzle, the characteristic of weft insertion flow in the point of hydrodynamics and the research significance of this dissertation is introduced in chapter 1.2. The principle of hydrokinetics is used to establish the numerical model of flow field in weft insertion flow of main nozzle of air jet looms in chapter 2.3. 3-D model of main nozzle is constructed by Pro/E, and the grids of weft insertion flow are constructed by Hypermesh. After that, the grids document is exported to GAMBIT that is the special pre-processing software of Fluent and set boundary conditions in chapter 3.4. A software named Fluent is used to simulate the geometrical model which is established by GAMBIT. Compared the simulating results with the test results, the feasibility of this method which uses Fluent to simulate the 3-D flow field in weft insertion of main nozzle of air jet loom is validated.5. Fluent is used to stimulate main nozzles with different number of slot nozzle core rectifier, introduction yarn diameter, distance between the outer of core and slot, and supply air pressures. The advantage of different combination of structure of main nozzle and supply air pressure is presented.