摘要
为了研究预应力对便携式轴流泵叶片的应力及应变的影响,基于有限元理论,在Workbench平台上,采用ANSYS CFX软件对轴流泵内部流场和叶轮结构进行耦合求解.其中流场计算选用以雷诺平均方程为基础的SST k-ω湍流模型.结构计算采用弹性体结构动力学方程,对叶轮叶片在不同流量工况下的变形和应力分布以及各阶模态变化进行了计算.结果表明:在水体作用力和旋转离心力作用下,轴流泵叶片的最大变形发生在叶片进口轮缘处,且从轮毂到轮缘的径向方向上,变形程度逐渐变大;在叶轮压力面靠近轮毂附近区域出现应力集中,各工况最大应力值均远小于最大拉应力,能够满足强度要求;有无预应力对转子系统的各阶模态影响很小,且不同流量工况下各阶模态的变化也很小.
To investigate the influence of prestress on stress and strain of portable axial flow pump blades, based on the finite element theory, the internal flow field and impeller structure of the axial flow pump were coupled by ANSYS CFX software on the Workbench platform. According to the Reynolds average equation, the flow field calculation was conducted by the SST k-ω turbulence model. The structural calculation was realized by the dynamic equation of elastic structure, and the deformation and stress distribution of impeller blades under different flow conditions and the modal changes of each order were calculated. The results show that under the actions of water body force and rotating centrifugal force, the maximum deformation of axial flow pump blade occurs at the blade inlet rim, and the deformation degree gradually increases from the hub to the rim radial direction. The stress concentration occurs in the vicinity of impeller pressure surface near the hub, and the maximum stress value of each working condition is much smaller than the maximum tensile stress, which can meet the strength requirement. The prestress has slight effect on the various modes of rotor system, and the variation of modes under different flow conditions is small.
作者
曹卫东
张骞
李伟
徐玉敏
CAO Weidong;ZHANG Qian;LI Wei;XU Yumin(Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang, Jiangsu 212013, China;Zhenjiang Research Institute of Fluid Engineering Equipment Technology, Jiangsu University, Zhenjiang, Jiangsu 212013, China)
出处
《江苏大学学报（自然科学版）》
EI
CAS
北大核心
2019年第3期282-287,共6页
Journal of Jiangsu University：Natural Science Edition
基金
国家重点研发计划项目(2018YFC0810506)
镇江市重点研发计划项目(SH2017049
BK20161472)
关键词
轴流泵
有限元分析
应力
应变
预应力
模态分析
axial flow pump
finite element analysis
stress
strain
prestress
modal analysis
