1、 分類號 S229 學校代碼 10129 U D C 621 學 號 2010205012 基于多孔介質理論的糧層阻力數值模擬 Simulation of Grain Layer Resistance Based on the Theory of Porous Media 申 請 人

2、：朱英開 學科門類：工 學 學科專業(yè)：機械設計及理論 研究方向：現代機械設計及理論 指導教師：塔 娜 教授 論文提交日期：二〇一三年六月Simulation of Grain Layer Resistance Based on the Theory of Porous Media Abstract Food safety affects the national economic and social development .

3、The food supply and price influence the CPI and urban and rural harmonious development of society. Because of the lack of ventilation resulted in the grain loss. So we are especially meaningful to study the grain layer v

4、entilation properties. Food particles group has porous medium characteristics. Based on the theory of porous media to study the grain ventilation and become an important content. Based on porous medium theory,this paper

5、using the computational fluid dynamics method simulates the grain layer resistance. As the same time tests the grain layer pressure drop data. Comparing simulation data and test data proves that the simulation method is

6、 feasible, simulation method can accurately response law of the pressure drop.Numerical simulation method can be used to estimate the optimal wind speed and wind pressure. Can be used to guide choosing appropriate fan ca

7、pacity. Using the computational fluid dynamics method to study the internal flow field in the micro porous medium. Calculated particle shape and particle size of different skeleton of porous media's influence on the

8、internal and distribution. Analyzed the different inlet velocity, maximum speed, maximum pressure and maximum turbulent kinetic energy and dissipation rate of parameters. Calculation and analysis the relationship between

9、 the three pressure gradient as the speed increases. This relationship can explain why the grain layer the pressure drop variations. Key words: porous media; Grain ventilation; Turbulence; Computational fluid dynamics