FLUENT Simulation Of Airflow Field Of Sugarcane-Top Cutter

As an important sugar crops in China, Sugarcane occupied a pivotal position in our country agriculture economy. At present, further development of sugarcane production was restricted and hindered by low production rate and popularity rate on mechanization of sugarcane and production mechanization level. Compare to some sugarcane production country has high mechanization, and with rapid development of information technology,our country has lagged far behind. Sugarcane harvesting mechanization technology is a very important link in sugarcane mechanization production, and became the “bottleneck” to restrict the sugarcane mechanization. At present, the research and manufacturing of sugarcane harvest machine consists of: the whole-talk type sugarcane harvester and cut sections of sugar cane harvester, but are suffer a problem of high impurity rate, so how to reduce the impurity rate of the harvested sugarcane has always been the emphasis and difficulty in the sugarcane harvest mechanization technology research.This paper takes the sugarcane harvester sugarcane-top cutter as theory research object,topping devices is the first step of the sugarcane harvester, also is the first step of removing impurity. Aim at the problems of high inclusions and low cleanliness of sugarcane at sugarcane harvesting, we adopt theoretical analysis of the cutting process. Using the Fluent to analyze the flow field of the topping devices, and tests the sugarcane-top cutter by single factor and orthogonal experiment. The main study contents and conclusions are follows:(1) The necessity of analyzing the sugarcane-top cutter. The 3-D model is mapped by Pro/E; Simplifying the 3-D model institutions for gridding; Creating and meshing the fluid domain by Gambit; Simulating the flow field of sugarcane-top cutter by Fluent, and get the distribution of the flow field under different speed(100r/min?200r/min?300r/min?400r/min and 500r/min); The professional post-processing software TECPLOT is used to analysis the simulation results, including wind speed ? static pressure ? dynamic pressure and totalpressure.(2) Through the test to verify the actual reliability of the results of simulation, and the applicability of the chosen method. Contrasting testing point of wind speed?gauge pressure and power under different rotational speed. Conclusion: the method of simulation chooses is also very applicable, simulation of flow field distribution is credible.(3) The experiment of the performance of the sugarcane-top cutter in test-bed. The signal factor experiment shows that with the increase of rotating speed, the power consumption of the sugarcane-top cutter increase after decrease. With the increase of feeding speed, the power consumption of the sugarcane-top cutter increase. With the increase of feeding angle, the power consumption of the sugarcane-top cutter increase after decrease.(4) The orthogonal experiment shows that three factors influencing power consumption, from the main to minor, are rotating speed, feeding speed and feeding angle.The rotating speed has relatively remarkable effect on the power consumption of the sugarcane-top cutter. With power consumption as test indexes, there are no interaction among rotating speed, feeding speed and feeding angle. The optimal parameters are given,including the rotating speed of 350r/min, the feeding speed of 1 m/s, the feeding angle of 7degrees.