基于Fluent的9R-40揉碎机内流场仿真与研究

发布时间：2018-09-03 18:56

【摘要】：锤片式揉碎机作为一种重要的秸秆饲料加工机械而被广泛地应用在饲料生产作业中。为研究揉碎机内部流场结构信息,运用计算流体力学软件Fluent对锤片式揉碎机内流场进行三维数值模拟,得到转子转速为2 800 r/min时揉碎机内流场的压力场结构信息和速度场结构信息。结果显示:气流高速区出现在抛送叶片的背风面,大小为60m/s;低速区出现在揉碎机转子中心处,大小为12m/s。压力最低区域在揉碎室与抛送室交界处锤架板之间转子中心附近,压力最高区域在锤片末端和抛送室下机壳内壁附近。揉碎室和抛送室交界处存在明显压降和紊流,有利于物料在气流的带动下从抛送室内抛出。抛送室区域存在涡流,且出料管处产生回流,容易造成物料堵塞,导致物料不易被抛出或二次揉碎,增加能耗。本研究通过对揉碎机内流场进行三维数值模拟,直观地显示其内部的静压力场和速度场结构信息;研究了物料在揉碎机内部的运动规律,为揉碎机流场结构优化提供了依据,继而为优化机具、提高整机效率提供理论基础。
[Abstract]:As an important straw feed processing machine, hammer crusher is widely used in feed production. In order to study the structure information of the flow field in the crusher, a three-dimensional numerical simulation of the flow field in the hammer crusher was carried out by using the computational fluid dynamics software Fluent. The structure information of pressure field and velocity field of crusher is obtained when rotor speed is 2 800 r/min. The results show that the airflow high speed region appears in the leeward surface of the throwing blade with the size of 60 m / s, and the low speed zone appears at the center of the crusher rotor with a size of 12 m / s. The lowest pressure area is near the rotor center between the crusher chamber and the throwing room, and the highest pressure area is near the end of the hammer and the inner wall of the lower shell of the throwing chamber. There is obvious pressure drop and turbulence at the junction between the crusher chamber and the throwing room, which is favorable for the material to be thrown out of the throwing room under the drive of air flow. There is eddy current in the area of the throwing room and reflux at the discharge pipe, which can easily cause material clogging, which leads to the material being not easy to be thrown out or crumbled twice, and the energy consumption is increased. Through the three-dimensional numerical simulation of the flow field in the crusher, the structure information of the static pressure field and the velocity field inside the crusher is displayed intuitively, and the movement law of the material inside the crusher is studied, which provides the basis for the optimization of the flow field structure of the crusher. Then it provides the theoretical basis for optimizing the machine tools and improving the efficiency of the whole machine.
【作者单位】：内蒙古农业大学机电工程学院;
【基金】：国家自然科学基金项目(51665047) 中国博士后科学基金项目(2014M552532XB)
【分类号】：S817.12

【相似文献】