基于Fluent的膜稈分離裝置的數(shù)值模擬分析
[Abstract]:In the aspect of cotton planting, it has become a big problem in agriculture nowadays that the plastic film is easy to be recycled. The residual plastic film not only pollutes the environment and adversely affects the cotton yield in the coming year, but also the waste plastic film itself is a waste of resources. In order to ensure the sustainable development of agriculture and realize the recovery and reuse of waste plastic film, it is necessary to separate waste plastic film from coarse cotton stalk and fine cotton stalk. The main contents of this paper are as follows: (1) establish the mathematical model of the membrane culm separation process and reveal the basic principle of the membrane culm separation device. The motion characteristics of membrane culm particles in the wind-free and windless regions are analyzed. (2) the flow field distribution of the initial model is obtained by numerical simulation of the membrane culm separator with Fluent software. The flow field and air separation efficiency are analyzed. (3) the effect of flow field and air separation efficiency on the flow field and air separation efficiency is studied by using the method of single factor and five levels, including different air supply velocity, air supply angle and equipment technological parameters (air outlet position, inlet shape, feed inlet position). The variation trend of the flow field and the suitable range of air separation parameters are obtained respectively. (4) after obtaining the reasonable range of the air supply velocity, the air supply angle and the location of the air outlet, The effect of combined flow field and air separation efficiency of different air separation conditions is studied by orthogonal test method. Three factors, namely the velocity of air supply, the angle of air supply and the position of air outlet, are made into three factors and three levels of orthogonal experiments, and the optimum combination is obtained. On the basis of this, the shape of the tuyere is analyzed by single factor analysis, and the suitable condition of air separation is obtained. (5) the relationship between the single factor research method and the orthogonal test method is analyzed. The intrinsic relation of the simulation results demonstrates the correctness and desirability of the Fluent numerical simulation method. Through the simulation and analysis of Fluent software, the influence of air supply velocity, air supply angle and different process parameters on the flow field and air separation efficiency of membrane stalk separation unit is obtained. The suitable air separation conditions are as follows: the air supply velocity is 12 m / s, The air supply angle is horizontal, the central position of the outlet is 45mm from the center of the model, the shape of the outlet is square, and the central position of the feed inlet is 340 mm from the center of the model. It provides theoretical basis and practical reference value for the optimization design of cylindrical membrane stalk separator.
【學(xué)位授予單位】:新疆大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:X712
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