摘要
利用有限元分析软件数值求解不同工况下混流泵的内部流场,了解前置导叶调节工况的基本规律,以改善混流泵在非设计工况运行时的水力性能。在叶轮叶片进口部位读取液流流入叶轮时绝对液流角、相对液流角、和绝对速度圆周分量的值,分析其随前置导叶安放角改变而变化的规律。结果表明,叶轮进口绝对液流角小于前置导叶安放角,流量越小相差的幅度越大;大流量工况下进口预旋调节的效果比小流量工况更为明显;在一定流量范围内,通过进口导叶调节使得叶轮进口液流满足无冲击进口或者较小冲角进口条件,可有效地改善混流泵在非设计工况的水力性能。
In order to improve the hydraulic performance of the mixed-flow pump in off-design condition and master the basic principle of inlet guide vane regulating condition,authors conducted the numerical simulation for internal flow field of mixed-flow pump in different operating conditions by using finite element analysis software.With the modification of setting angle of the inlet guide vane,the change regulation of absolute flow angle,ralative flow angle and circumferential component of absolute velocity in impeller inlet were analyzed.The results showed that absolute flow angle was less than setting angle,and the smaller the flow was,the larger the difference was,and the effect of inlet guide vane regulation under large flow condition was more obvious than under small flow condition.The results also indicated that the inlet liquid flow can satisfy non-impact or smaller incidence angle inlet conditions in certain flow extent,and the pump can be operated with high efficiency in off-design conditon.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2010年第10期124-128,共5页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家科技支撑计划项目(2008BAF34B10)
关键词
泵
叶轮泵
数值分析
模型
混流泵
前置导叶
预旋调节
pumps
vane pumps
numerical analysis
models
mixed-flow pump
inlet guide vane
pre-whirl regulation
