摘要
为探索对旋风机在矿井含尘环境中叶片的磨损情况,以及颗粒长久性磨损造成叶片表面粗糙度增加的后果,基于SST k-ω湍流模型和Finnie磨损模型,利用多相流求解技术对FBD No.6.3矿用对旋式局部通风机进行气固两相流数值模拟,分析不同颗粒浓度和粒径条件下叶片磨损分布特征,探究叶片表面粗糙度对风机内部流场和整机性能的影响。结果表明:气固两相流场内颗粒浓度对叶片磨损率的影响较大,磨损率随浓度的增加而增大;叶片表面粗糙度的均匀和非均匀分布形式导致前缘和尾缘不同程度的能量耗散,在进行对旋风机气固两相非定常流动特性的分析时,应采用粗糙度非均匀分布的方法真实反映叶片粗糙度变化的影响;风机性能随叶片粗糙度的增大而降低,大流量工况下的影响更为显著,但随工作时间的增长,叶片表面粗糙度均匀性提高,流场恶化情况减缓。因此,适时修复或更换磨损叶片,有利于风机安全高效运行。
In order to explore the blade erosion of the counter-rotating fan in the dusty mine environment, and the roughness increase in the blades surface caused by the long-term particle erosion, based on the SST k-ω turbulence model and Finnie erosion model, the gas-solid two-phase flow numerical simulation was carried out on FBD No.6.3 mining counter-rotating local fan by using the multiphase flow solution technology.The blade erosion distribution characteristics at different particle concentrations and particle diameters were analyzed.The influence of blade roughness on the flow field and the fan performance was investigated.The research results show that the particle concentration in the gas-solid two-phase flow field has a great effect on blade erosion rate.As the concentration increases, the erosion rate increases.The blade roughness distribution form causes different energy dissipation degrees at the leading and trailing edges.In analyzing the unsteady flow characteristics, the uneven distribution should be used to truly reveal the influence on blade roughness changes.The performance decreases with the blade roughness increasing, and the roughness is more obvious in large flow conditions.As working hours increase, the blade surface uniformity roughness is improved, and the flow field deterioration is slowed down.Therefore, the erosion blades should be repaired or replaced in time to ensure the safe and efficient fan operation.
作者
吴燕妮
姜华
张浩睿
宫武旗
WU Yanni;JIANG Hua;ZHANG Haorui;GONG Wuqi(College of Energy Science and Engineering,Xi’an University of Science and Technology,Xi’an 710054,China;School of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,China)
出处
《西安科技大学学报》
CAS
北大核心
2023年第1期89-98,共10页
Journal of Xi’an University of Science and Technology
基金
国家重点基础研究发展计划(2018YFB0606104)。
关键词
对旋风机
气固两相流
叶片磨损
叶片粗糙度
风机性能
counter-rotating fan
gas-solid two-phase flow
blade erosion
blade roughness
fan performance
