摘要
为了研究离心泵仿生叶片的减阻降噪特性,获得叶片壁面剪应力与减阻率、效率和噪声变化情况的关系,提取出了鲨鱼皮肤的表面特征,建立了具有Ⅴ型槽表面叶片的离心泵模型.通过剪切应力传输(SST)k-ω湍流模型对离心泵内部流场进行数值模拟,基于Proudman方法和声类比方程对泵内部声场进行了预测计算.研究结果表明:仿生表面能够有效控制叶片近壁面边界层的流体流动,在出口处的壁面剪应力梯度变小,工作面叶片的平均剪应力最大降幅达29%;仿生表面可以降低的最大减阻率为3.1%,离心泵的水力效率最大提高2.06%;仿生叶片沟槽表面能够改变叶轮流道内的涡结构,降低离心泵叶轮内部的湍动程度,减小流道内的声功率;与光滑叶片相比,仿生叶片的总声压级的降幅最大为2.68%;随着流量的增大,壁面平均剪应力的变化率、效率、总声压级及减阻率等都随之增大.
The surface features of the shark skin were extracted and a centrifugal pump model withⅤ-groove surface blades was established for studying the characteristics of drag reduction and noise reduction of the bionic blade of a centrifugal pump and obtaining the relationship between the wall shear stress of the blade surface and the drag reduction rate,efficiency and noise changes.The internal flow field of the centrifugal pump was numerically simulated by the shear stress transfer(SST)k-ωturbulence model,and the internal sound field of the pump was predicted based on the Proudman method and the acoustic analog equation.The results show that the fluid flow in the boundary layer near the wall of blades can be controlled effectively by the bionic surface,so that the wall shear stress gradient at the outlet becomes smaller and the maximum amplitude reduction on the average shear stress of pressure face of the blade reaches 29%.The maximum drag reduction rate that the bionic surface can reduce is 3.1%,and the enhancement of the centrifugal pump efficiency peaks at 2.06%.The bionic blade groove surface can change the vortex structure in the impeller flow channel,reduce the of turbulence degree inside the centrifugal pump impeller,and reduce the acoustic power in the flow channel.Compared with the smooth blade,the total sound total pressure level of the bionic blade has the largest decrease of 2.68%.As the flow rate increases,the change rate of the average wall shear stress increases gradually,and the drag reduction rate,the efficiency of the centrifugal pump,and the change rate of the total sound pressure level of the internal sound field increase.
作者
代翠
戈志鹏
董亮
刘厚林
DAI Cui;GE Zhipeng;DONG Liang;LIU Houlin(School of Energy and Power Engineering,Jiangsu University,Zhenjiang 212013,Jiangsu China;Research Center of Fluid Machinery Engineering and Technology,Jiangsu University,Zhenjiang 212013,Jiangsu China)
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2020年第9期113-118,共6页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(51879122,51779108,51779106)
镇江市重点研发计划资助项目(GY2017001,GY2018025)
西华大学流体及动力机械教育部重点实验室开放课题资助项目(szjj2017-094)
过程装备与控制工程四川省高校重点实验室开放基金资助项目(GK201816)。
关键词
离心泵
仿生
减阻
降噪
剪应力
Ⅴ型槽
centrifugal pump
bionic
drag reduction
noise reduction
shear stress
Ⅴgroove
