| The air conditioning is a very important part of the production process in the textile mill, and its energy consumption accounts for20%to30%of the total energy consumption, which is called "the big energy consumers of textile mill", therefore, the energy-saving problem is very important. Because of special climate conditions, Evaporative cooling has been applied widely in China’s northwest region and the air conditioning system in textile factory also. As an key equipment of air conditioning system-air washer,which will directly affect the workers’health and the quality of the product.The nozzle is the core component of the spray chamber, and its performance is the water sprayed into fine droplets and increasing the contact area between the air and water, in order to enhancing the efficiency of the heat and moisture transfer. Factors that affect the effect of the atomization are structural dimensions, pressure, and velocity and atomization range of nozzle.Traditional centrifugal nozzle is often used in the spray chamber at present, but there are some disadvantages in it, easily to be plugged, small atomizing angle, Installation and maintenance management are inconvenient, Etc. In this case,_a new kind of nozzle-target type impinging nozzle is proposed. In the energy conservation policy, combined with the research results of target type impinging nozzle of evaporative cooling team of Xi’an University of Engineering, study the experimental tests and three-dimensional numerical simulation studies using Fluent software on single target type impinging nozzle in this paper, according to comparing with the experimental results and the simulation results, obtain a conclusion that the simulation is feasibility. Thus, this thesis is as follows:(1) The experimental study of target type impinging nozzleBase on the experiment tables that is designed and builds and prepare test tools, to test the related content:measure the actual water spray quantity, range, spray cone angle of a single nozzle in the different dimensions and pressure,_and these data are classified. At the same time, comparative and analyze this date of target type impinging nozzle and traditional centrifugal nozzle, obtain some advantages of target type impinging nozzle. In a word, the experimentally measured data provide theoretical guidance for study of target type impinging nozzle.(2)The numerical simulation study of target type impinging nozzleNumerical simulation using Fluent software, which basic idea is that together physical quantities, such as velocity and temperature field, that is continuous in time and space and interconnected through variable value of a series of discrete points,_and establish the relationship between these discrete points._Since many data are subject to the influence of external conditions in the course of the experiment, establish a three-dimensional mathematical model of target type impinging nozzle use the Gambit on the basis of the experimental, and determine a reasonable meshing program and the turbulence model. According to the mathematical model, simulate atomization of the range, velocity and pressure distribution in the situation of different structural dimensions and pressure by Fluent, further drawn atomization characteristics conclusion of target type impinging nozzle.(3)Contrast the experimental results with the simulation results of target type impinging nozzleAccording to analyze the simulation results and experimental results, summed up the nozzle atomized influence factors are structure size and pressure, provide a theoretical basis for the improved nozzle. Also show that Fluent is used to reach target type impinging nozzle is feasibility.This paper summarizes the conclusions and inadequate of target type impinging nozzle, and raised the outlook in the future research work. The conclusion of the article provides a reference for the nozzle application in the future. |
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