摘要
为研究设计工况下蜗壳式离心泵内部瞬态流动的状态和规律，基于高质量结构化网格和快速成型技术，利用商业计算软件CFX对某型号蜗壳式离心泵进行了全流场非定常数值模拟。通过与定常数值模拟结果及试验结果比较，表明非定常数值模拟能够更为准确地预测蜗壳式离心泵的性能参数，其中扬程最大偏差在4％以内，效率最大偏差在3％以内。受叶轮一蜗壳耦合作用影响，蜗壳式离心泵内部压力脉动周期性明显，监测点压力脉动主频均为叶片通过频率。非定常下的压力场表明，各叶轮流道进口及中间位置的压力分布相近，靠近叶轮出口的压力分布差异明显；蜗壳内部存在明显的二次流动现象，并且随主流运动向前发展。
In order to study the flow characteristics in centrifugal pump at design condition, the inner unsteady flow was simulated based on high-quality structured grid and rapid prototyping technology by using the commercial software CFX. The results indicate that the method of unsteady numerical simulation can accurately predict the performance parameters of the centrifugal pump with the test. The maximum deviation of head and efficiency are less than 4% and 3% , respectively. Impacted by the impeller-volute coupling, the pressure pulsation in volute centrifugal pump has strong periodicity, and the basic frequency is the blade passing frequency. There is a similar pressure field between the impeller passage inlet and the middle of impeller passage, but the pressure distribution near the impeller outlet has a significant difference. Significant secondary flow phenomena exist in the volute and move forward with the mainstream.
出处
《农业机械学报》
EI
CAS
CSCD
北大核心
2014年第3期49-53,60,共6页
Transactions of the Chinese Society for Agricultural Machinery
基金
国家自然科学基金资助项目（51279069）、江苏高校科研成果产业化推进项目（JHB2012-38）和江苏高校优势学科建设工程资助项目
关键词
蜗壳式离心泵
非定常
性能预测
流场分布
压力脉动
Volute centrifugal pump Unsteady flow Performance prediction Flow field distributionPressure fluctuation
