Analysis And Experimental Study On Temperature Field And Flow Field In Huller

Rice is one of the main grains in China,which accounts for a large proportion in the grain.According to the national statistical data in 2020,the output of rice is 21.86 million tons.According to the relevant literature,the broken rice rate of rice processing is estimated as 20%,and China will lose 42.38 million tons of rice every year.Therefore,it is particularly important to reduce the broken rice rate in rice processing.In this paper,taking a small combined rice husker as the object,through the experiment of fresh rice husker,it is found that the change of temperature in the husker has a strong correlation with the breaking of brown rice.It is necessary to analyze and study the temperature field and flow field in the husker,in order to improve the structure of the husker and the air suction channel.n this paper,the finite element model of the flow field in the rice husker was established firstly,and the numerical simulation of the temperature field and flow field in the rice husker was carried out based on hydrodynamics.Then,the turbulence model and boundary conditions of the numerical simulation of the rice husker were modified by comparing the numerical simulation results with the experimental results,so as to ensure the accuracy and rationality of the numerical simulation method,Finally,the optimization design of the rice huller and the suction channel was carried out,and the numerical simulation method was used to verify the improvement effect of the temperature field and flow field in the rice huller.The main research contents are as follows:1.Experimental study on temperature and velocity of husk chamber.In order to explore the distribution of temperature field and flow field in the hulling chamber,the experimental design of temperature field and flow field in the hulling chamber was carried out,and the temperature and air velocity in the hulling chamber were measured by using infrared thermal imager and thermal anemometer;The results show that the highest temperature in the hulling chamber is 55.9 ?,the lowest temperature is 8.2 ?,and the maximum air velocity is 17.37 in the suction channel;The test results provide necessary data support for the numerical simulation of temperature field and flow field in the rice huller.2.Study on numerical simulation method of temperature field and flow field in huller.Based on the experimental results of the temperature and air velocity in the rice huller,the numerical simulation environment of the temperature field and flow field in the rice huller was established firstly,and then the distribution of the temperature field and flow field in the rice huller was simulated and analyzed by using FLUENT software;Finally,the numerical simulation results of temperature field and flow field in the rice husker were compared with the experimental results to verify the accuracy and rationality of the turbulence model and boundary conditions selected in the numerical simulation of the rice husker;The results show that the numerical simulation method of temperature field and flow field is feasible.3.Optimized design of hulling chamber structure.In view of the distribution of temperature field and flow field in the hulling chamber and the existing problems,the optimization scheme of the hulling chamber was put forward,and the numerical simulation of the optimized hulling chamber was carried out by using the numerical simulation method of temperature field and flow field in the hulling chamber,and the simulation results before and after the optimization were compared and analyzed.The results show that the temperature field and flow field in the hulling chamber are improved.It is proved that the theory of hydrodynamics has a certain effect on the optimization of the structure of the hulling chamber,which is conducive to reducing the broken rice rate in the process of hulling.