摘要
为研究离心泵叶轮叶片尾迹对压力脉动的影响,以一台低比转数离心泵为研究对象,运用DDES(delayed detached eddy simulation)方法,开展了泵内精细非定常数值计算,对比了普通叶轮、翼型叶片叶轮和偏置小翼叶轮这3种方案下的泵压力脉动频谱特性及尾迹涡结构.结果表明:偏置小翼叶轮可明显提升泵的扬程,设计工况附近效率高于其他2种方案,且高效区变宽;与普通叶轮相比,偏置小翼方案叶频处压力脉动幅值大幅降低,特别在隔舌附近叶频幅值下降43%,且低频范围内脉动能量亦得到抑制;受到偏置小翼尾迹干涉的影响,叶轮叶片尾迹高涡量区域明显减小,涡量平均强度减弱,这是压力脉动幅值降低的主因.因此,偏置小翼可有效抑制叶轮叶片尾迹涡从而降低泵压力脉动能量.
Wake structure of the impeller blade is an important factor which can induce strong pressure pulsation in a centrifugal pump.A low specific speed centrifugal pump was chosen as the research object.The unsteady calculation of the flow flied was carried out by DDES(delayed detached eddy simulation)method in the pump.The pressure pulsation spectrum characteristics and wake vortex structures of three impeller types,i.e.,the ordinary impeller,airfoil blade impeller and offset blade impeller,were compared in detail.It is shown that the pump head is significantly increased with the offset blade impeller.The efficiency near the design working condition is higher than the other two impeller types,and the high efficiency area is wider.Compared with the ordinary impeller,the pressure pulsation amplitude at the f_(BPF) solution is greatly reduced with the offset blade,especially in the vicinity of the tongue.The f_(BPF) amplitude drops by 43%,and the pulsation energy in the low frequency range is also suppressed.Due to the effect by the interference of the offset blade wake,the high vorticity area of the impeller blade wake is significantly reduced,and the average vorticity intensity is weakened,which is the main reason for the decreasing of the pressure pulsation energy.Therefore,the offset blade design can effectively suppress the impeller blade wake vortex and reduce the pump pressure pulsation energy.
作者
高波
周志威
倪丹
张宁
顾嘉嵘
GAO Bo;ZHOU Zhiwei;NI Dan;ZHANG Ning;GU Jiarong(School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China)
出处
《排灌机械工程学报》
CSCD
北大核心
2022年第8期766-770,813,共6页
Journal of Drainage and Irrigation Machinery Engineering
基金
国家自然科学基金资助项目(51576090)
江苏省“六大人才高峰”资助项目(KTHY-060)
镇江市重点研发计划(GY2018023)。
关键词
离心泵
偏置小翼
压力脉动
尾迹结构
噪声
centrifugal pump
offset blade
pressure pulsation
wake structure
noise
