摘要
蜗壳式离心泵作为流体输送的核心设备,压力脉动及水利性能对泵的稳定性、噪声、寿命等有重大影响。结合曲率控制前缘的设计方法,按增长率1.19%、0.47%、0.32%设计,建立前缘轴长比为0.96、2.11、3.11、4.11的蜗壳式离心泵,以SSTκ-ω模型定常计算结果为初始条件,进行κ-εRNG模型非定常分析,通过频域图分析蜗壳式离心泵压力脉动,并通过矢量云图分析水力性能。结果表明:设计的模型最佳流量为35 m 3/h,设计效率与模拟效率误差仅为2%;前缘轴长比不同,流道内压力扩散有差异;前缘轴长比为3.11时出口压力脉动偏低,低频区更易产生压力脉动;前缘轴长比为0.96时,压力脉动范围偏小,适用于一定流量范围内扬程变化较大的工况。
Volute centrifugal pump is the core equipment for fluid transportation.The pressure pulsation and hydraulic performance have a significant impact on the stability,noise and life of the pump.Combined with the design method of curvature control leading edge,as the growth rate of 1.19%,0.47% and 0.32%,volute centrifugal pumps with the leading edge axis ratio of 0.96,2.11,3.11 and 4.11 were established.Taking the steady calculation results of SSTκ-ω model as the initial condition,the unsteady analysis ofκ-εRNG model was carried out.The pressure pulsation was analyzed by frequency domain diagram,and the hydraulic performance was analyzed by vector cloud image.The results show that the optimal flow rate of the designed model is 35 m 3/h,and the error between design efficiency and simulation efficiency is only 2%;the axial length ratio of the leading edge is different,and the pressure diffusion in the flow channel is different;when the axis ratio of the leading edge is 3.11,the outlet pressure pulsation is low,and the pressure pulsation is more likely to occur in the low frequency region;when the axis ratio of the leading edge is 0.96,the pressure fluctuation range is small,which is suitable for the working condition with large head change in a certain flow range.
作者
黎伟
周贤成
牟磊
吴蔚
赵兴安
LI Wei;ZHOU Xiancheng;MOU Lei;WU Wei;ZHAO Xingan(School of Mechanical Engineering,Southwest Petroleum University,Chengdu Sichuan 610500,China;Key Laboratory of Oil&Gas Equipment,Ministry of Education,Southwest Petroleum University,Chengdu Sichuan 610500,China;Chengdu Chenghang Vehicle Instrument Co.,Ltd.,Chengdu Sichuan 611730,China)
出处
《机床与液压》
北大核心
2024年第7期140-146,共7页
Machine Tool & Hydraulics
基金
四川省区域创新合作项目(2020YFQ0035)。
关键词
蜗壳式离心泵
曲率控制
压力脉动
数值分析
水力性能
volute-type centrifugal pump
curvature control
pressure pulsation
numerical analysis
hydraulic performance
