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矿山装备关键旋转件轴-径组合式磁性液体密封结构设计及性能
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作者 刘程 鲍久圣 +2 位作者 阴妍 赵少迪 曹靖雨 《润滑与密封》 CAS CSCD 北大核心 2022年第11期160-166,共7页
针对传统机械密封运行阻力大、寿命短和轴向式磁性液体密封适用性差等问题,结合矿山装备旋转部件的高转速、重载荷工况特点,提出一种新型轴-径组合式磁性液体密封结构。对密封结构中关键部件的尺寸参数进行优化;用ANSYS软件对轴-径组合... 针对传统机械密封运行阻力大、寿命短和轴向式磁性液体密封适用性差等问题,结合矿山装备旋转部件的高转速、重载荷工况特点,提出一种新型轴-径组合式磁性液体密封结构。对密封结构中关键部件的尺寸参数进行优化;用ANSYS软件对轴-径组合式与单一轴向式密封结构进行磁场特性仿真,并将2种密封结构的密封性能进行对比。结果表明:新型轴-径组合式磁性液体密封的结构设计合理,可有效避免因离心力造成的高速旋转轴密封失效问题,且相比于单一轴向式磁性液体密封结构其耐压能力提高了52.7%,验证轴-径组合式密封结构的可靠性。 展开更多
关键词 矿山装备 旋转密封 高速重载 磁性液体 轴-径组合
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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
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作者 吴南星 崔志慧 +3 位作者 张鑫 李斌 邓立钧 江竹亭 《粉末冶金技术》 CAS CSCD 北大核心 2023年第2期159-166,共8页
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... 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。 展开更多
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
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Numerical Investigation of the Superimposed Effects on Stator Wake Oscillation in an Axial-radial Combined Compressor
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作者 ZHAO Ben YANG Ce +2 位作者 HU Liangjun ZHOU Mi ZHANG Jizhong 《Journal of Thermal Science》 SCIE EI CAS CSCD 2014年第1期22-35,共14页
The superimposed influences of the blade rows in a multistage compressor are important because different matches of upstream and downstream blades can result in significant differences in the stator wake oscillation. ... The superimposed influences of the blade rows in a multistage compressor are important because different matches of upstream and downstream blades can result in significant differences in the stator wake oscillation. Numerical investigation of the axial stator wake oscillation, which is affected upstream by the axial rotor and downstream by the radial rotor, was performed in an axial-radial combined compressor. Many configurations with different blade numbers and locations, which influence axial stator wake oscillation were investigated. When rotors have equal blade numbers, the axial stator wake oscillates periodically versus time within time T(moving blade passing 1/3 revolution). In contrast, stator wake oscillates irregularly within T when rotors have different blade numbers. A model-split subtraction method is presented in order to separate the influences of the individual blade rows on the wake oscillation of the axial stator. Analysis from the rotor-stator configuration showed that the unsteady flow angle fluctuation response is caused by the upstream rotor. For the rotor-stator-rotor configuration, the unsteady flow angle fluctuations are influenced by upand downstream blade rows. With the model-split subtraction method, the upand downstream influences on the flow angle fluctuation could be clearly separated and quantified. Low amplitudes could be observed when the influences from upand downstream moving rows were superimposed with the "positive peaknegative peak" type wave. Clocking investigations were carried out to change the relative superimposed phase of influences from the surrounding blade rows in order to modulate the amplitudes of the axial stator wake oscillation. However, the amplitudes did not reach the maximum when they were superimposed with "positive peak-positive peak" type wave due to the impact of the interaction between the two moving blade rows. 展开更多
关键词 axial-radial combined compressor wake oscillation superimposed effect absolute flow angle CLOCKING
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