高速空气射流冲击颗粒物料层的参数特性  

Parameter Characteristics of Using the High-speed Air Jet to Impact Granular Material Layer

作　　者：龚曙光[1] 何峰[1] 刘克俭[2] 隆香花[1] 

机构地区：[1]湘潭大学机械工程学院,湘潭411105 [2]中冶长天国际工程有限责任公司,长沙410007

出　　处：《机械工程学报》2015年第15期142-147,共6页Journal of Mechanical Engineering

基　　金：国家自然科学基金资助项目(51375417;51475403)

摘　　要：针对高速空气射流冲击颗粒物料层的问题,选取realizableκ-ε湍流模型,建立高速空气冲击射流的参数化仿真模型,在验证所建模型可行性的基础上,通过仿真分析探讨了喷嘴直径、喷距等参数对射流中心轴线速度的影响,得到滞点压强与喷距、喷嘴直径的关系;建立单孔喷嘴地秤试验平台,通过试验测试得到了不同射流压力下冲击质量与喷距的关系,并利用得到的最佳喷距长度模拟了空气射流冲击铁粉颗粒层的过程,得到了冲击孔周围的质量分布云图,以及冲击孔深度和直径随射流压力的变化规律,且其仿真结果与试验测试结果基本吻合。所得结果可为工程应用上利用高速空气射流冲击来穿透颗粒物料层提供指导。Aiming at the problem of using high-speed air jet to impact granular material layer, the parameter simulation model of high speed air jet is built by using realizable κ-ε turbulence model. The influence of nozzle diameter, jet distance on center axial velocity of jet is discussed on the basic of verifying the presented model feasibility, and the relations between jet distances, nozzle diameter and stagnation point pressure are obtained. The truck scale test platform of single-hole is established, and the experimental tests have been finished to obtain the relation curve between impacting mass and spray distance under different jet pressure. The process of using air jet to impact the iron granular layer is simulated by using the best spray distance length, which is obtained by experimental test. The mass distribution around the hole formed by jet impact is achieved by simulating method, and the variation of depth and diameter of hole with jet pressure is given. The results obtained by simulating are agreement with the test ones. It can provide guidance to use high-speed air jet to penetrate the granular material layer in the practical application.

关 键 词：冲击射流 喷嘴直径 喷距 滞点压强 颗粒物料 

分 类 号：TP601[自动化与计算机技术—控制理论与控制工程]