水泵进水口预旋及涡流强度研究

he article talk about incorrect—designed intake structure of a pumping station which may result in pre—swirl in the flow entering the pump and swirl in suction pipe even under no pump operation baseing on experiment ，which shall change flow condition，and affect adversely both pump performance and cavitation characteristics．So we have to put forward in this paper for investigating pre—swirl in flow entering the pump intake and for measuring swirl in the suction pipe．By means of tuft flow visualization method pre—swirl in flow entering the suction bell is observed，and swirl angles of flowin the pump suction pipe are measured with a swirl meter． Evaluation of pump intake design can be madequalitatively and quantitatively，and schemes of intake design can be optimized as well With the help of the new technique，a favorable flow condition can be created for a pump and the operation safety and reliabilities ofa pumping station can be improved obviously．