基于CFD技术的立式水力碎浆机内流特性分析

Internal Flow Characteristics of Vertical Hydraulic Pulpers Based on CFD Technology

目的 对立式水力碎浆机内部流场特性进行分析,为改善碎浆效果和改进碎浆机的设计生产提供一定的理论依据。方法 利用AnsysFluent软件对水力碎浆机内部流场进行数值模拟分析,采用控制变量法研究叶片数量、转子离底间隙、扰流板数量对流场特性的影响,流场的评价指标有速度场、压力场、转子功耗等。结果 数值模拟分析结果表明,立式水力碎浆机内部流体流动为典型的轴向流动模式,叶片数量、转子离底间隙及扰流板数量对流场静压和转子功耗影响较大,对流场速度影响相对较小;当转子叶片数量为2、转子离底间隙为10 mm、扰流板数量为3时,碎浆机结构的功耗相较于原始结构的功耗降低了8.5%;内部流体流动速度也大于原始结构,碎浆效率有所提高。结论 获得了水力碎浆机的内流特性,为水力碎浆机升级改进提供了参考,从而助力纸模包装行业的发展。

The work aims to analyze the internal flow field characteristics of vertical hydraulic pulpers to provide a theoretical basis for improving the pulping effect and the design and production of pulpers.A numerical simulation analy-sis of the internal flow field of a hydraulic pulper was carried out with Ansys Fluent software.The control variable me-thod was used to study the impact of the number of blades,the rotor clearance from the bottom,and the number of spoiler plates on the flow field characteristics.The characteristics of the flow field were evaluated by the velocity field,pressure field and rotor power consumption.The numerical simulation results showed that the fluid flow in the vertical hydraulic pulper was a typical axial flow mode.The number of blades,the rotor clearance from the bottom and the number of spoi-ler plates had a greater impact on the static pressure of the flow field and the power consumption of the rotor,while the impact on the velocity of the flow field was relatively small.When the number of rotor blades was 2,the rotor clearance from the bottom was 10 mm,and the number of spoilers was 3,the power consumption of the pulper structure was re-duced by 8.5%compared with the original structure.The internal fluid flow velocity was also faster than that of the orig-inal structure,while the pulping efficiency was improved.The internal flow characteristics of the hydraulic pulper were obtained.The research results provide a theoretical basis and reference for upgrading of vertical hydraulic pulpers and promote the development of the paper packaging industry.