摘要
为了提高某割草车的工作效率,降低其长时间工作时的能源损耗,对其割台中的刀盘和刀片进行建模与仿真分析,通过对刀盘角区和刀片形状进行优化,达到节能的效果。首先,对割草过程中刀盘内的流场情况进行数值模拟,分析了刀片和刀盘所受的压力、刀片的速度以及刀片所受扭矩;其次,基于流场分析规律,对刀盘角区和刀片的形状进行优化,提出3个优化方案;然后,以扭矩的大小作为方案是否节能的主要评价指标,并与原方案进行对比分析,得到节能效果最优的设计方案;最后,将优化后的刀片加工成形,装在实车上进行试验,试验结果与仿真结果的误差小于5%,说明仿真结果正确,同时试验结果验证了该优化方案具有良好的节能效果。仿真与试验结果表明:刀片形状对割草机工作过程中的流场及扭矩等有重要影响,异形刀片有助于减小流场涡流与风阻,从而减小刀片上的扭矩,达到节能提效的目的。
In order to improve the working efficiency of a lawn mower and reduce its energy lossduring long-term operation,the modeling and simulation analysis of the cutterhead and blade in the header is performed,and the energy-saving effect is achieved through the optimization design for the shape of the cutterhead corner area and blade.Firstly,the numerical simulation of the flow field of the cutterhead during mowing process was performed to analyze the pressure conditions of blades and the cutterhead,the speed of blades and the torque conditions of blades;Secondly,according to the law of flow field analysis,the shape of the cutterhead corner area and the blade were optimized,and three optimization schemes were proposed;Thirdly,the torque was used as the main evaluation index of the scheme energy-saving effect,the optimal design scheme was obtained by comparing with the original scheme;Finally,the optimized blade was completed and the test was carried out on a real car.The error between the test result and the simulation result was within 5%,which indicated that the simulation result was effective,and the test result verified the energy-saving effect of the optimized program.Simulation and experimental results show that the cutterhead shape has an important influence on the flow field and torque during the operation of the lawn mower.Shaped blade helps to reduce the eddy current and wind resistance of the flow field,which reduces the blade torque to achieve the purpose of energy saving and effi-ciency improvement.
作者
李舜酩
王一博
顾信忠
LI Shun-ming;WANG Yi-bo;GU Xin-zhong(College of Energy and Power Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China)
出处
《工程设计学报》
CSCD
北大核心
2018年第6期683-689,共7页
Chinese Journal of Engineering Design
基金
国家自然科学基金资助项目(51675262)
国家重点研发计划资助项目(2016YFD0700800)
关键词
割草车
刀片优化
数值模拟
lawn mower
blade optimization
numerical simulation
