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。
Knead hammer type crusher as an important kind of straw feed processing machinery and is widely used in animal feed production. For the study of flow characteristics of material within the mill, this paper using the computational fluid dynamics software FLUENT to structure new knead u nder the hammer crusher internal flow field in the 3 d simula- tion of the speed of 2 800 r/min and rubbing mill pressure distribution of flow field and the internal flow field velocity distribution, accurately reflect the flow field structure information. The result shows： the low pressure area near the center of rotor, the highest pressure area under the room threw the sending end of the blade and send the inner wall of the cas- ing. High-speed airflow zone in toss leeward side of the blade, low speed area appears in the center of the rubbing mill housing and rotor. Knead crushing chamber and toss junction. The obvious pressure drop, good material in air driven from within the machine. Toss room areas exist vortex area, discharging straight tube and generate reflux, easy to cause the material blockage, lead to material not easily thrown or secondary grist, increase energy consumption. This article through to the flow field in the roll crusher three numerical simulation of the intuitive shows its internal static pressure field and velocity field, knead for mill flow field provide a basis for the structural optimization, providing theoretical basis for improve the machine efficiency, reducing energy consumption.
出处
《农机化研究》
北大核心
2017年第9期14-18,共5页
Journal of Agricultural Mechanization Research
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)
