摘要
针对干法制粒氮化硅室内混合效果不佳、颗粒球形度较差等问题,研究了开启涡轮式轴-径组合结构倾角参数对干法制备氮化硅颗粒混合效果的影响,建立了欧拉-欧拉气固两相流数学模型并简化轴-径组合结构制粒室物理模型,采用计算流体力学方法分析了轴向结构在不同倾斜角度下制粒室内氮化硅颗粒的体积分布与速度场,通过实验检测了氮化硅颗粒球形度,从侧面验证了数值模拟结果的准确性。数值模拟结果表明,当倾角为45°时,氮化硅颗粒体积分数处于0.3~0.7之间(占比28%),相比于倾角为30°、60°时,有较好的循环流动性,混合效果最佳。实验结果证实,当轴-径组合结构倾角为45°时,氮化硅颗粒平均球形度最佳为0.72,能够有效提高氮化硅颗粒混合效果。
To solve the problems of poor mixing effect and poor sphericity for the silicon nitride particles in the dry granulation chamber,the influence of the inclination parameters for the open turbine typed axial-radial combined structure on the mixing effect of silicon nitride particles prepared by dry method was studied.The mathematical model of Eulerian-Eulerian gas-solid two phase flow was established,and the physical model of the axial-diameter combined structure granulation chamber was simplified.The computational fluid dynamics(CFD)method was used to analyze the volume distribution and velocity field of silicon nitride particles in granulation chamber in the axial structure under the different inclined angles.The sphericity of silicon nitride particles was tested by experiments,and the accuracy of numerical simulation results was verified.The numerical analysis results show that,when the inclination angle is 45°,the volume fraction of silicon nitride particles is 0.3~0.7(accounting for 28%),showing the better circulating fluidity and the best mixing effect,compared with the inclination angle of 30°and 60°.The experimental results show that,the best average sphericity of the silicon nitride particles is 0.72 when the inclination angle of the axis-diameter combined structure is 45°,which can effectively improve the mixing effect of silicon nitride particles.
作者
吴南星
崔志慧
张鑫
李斌
邓立钧
江竹亭
WU Nanxing;CUI Zhihui;ZHANG Xin;LI Bin;DENG Lijun;JIANG Zhuting(School of Mechanical and Electronic Engineering,Jingdezhen Ceramic University,Jingdezhen 333403,China;National Engineering Research Center for Domestic and Building Ceramics,Jingdezhen Ceramic University,Jingdezhen 333403,China)
出处
《粉末冶金技术》
CAS
CSCD
北大核心
2023年第2期159-166,共8页
Powder Metallurgy Technology
基金
国家自然科学基金资助项目(51964022)。
关键词
轴-径组合结构
氮化硅颗粒
倾角参数
干法制粒
混合效果
计算流体力学
axial-radial combined structure
silicon nitride particles
inclination parameters
dry granulation
mixing effect
computational fluid dynamics
