Effect of rotational speed on the hydraulic performance for flow conduits of shaft extension tubular pumping system

Asian Working Group- IAHR's Symposium on Hydraulic Machinery and Systems

Gao, H.^1 ; Yang, F.^1 ; Chen, S.J.^1 ; Liu, Ch^1,2

School of Hydraulic, Energy and Power Engineering, Yangzhou University, Yangzhou, Jiangsu, China^1

Hydrodynamic Engineering Laboratory of Jiangsu Province, Yangzhou, Jiangsu, China^2

关键词: Average velocity;    Flow rate coefficients;    Hydraulic efficiency;    Hydraulic performance;    Linear functional;    Outlet conduits;    Rotational speed;    Static-pressure ratio;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/163/1/012038/pdf
DOI  :  10.1088/1755-1315/163/1/012038

来源: IOP

【 摘 要 】

In order to investigate the effect of rotational speed on hydraulic performance of inlet and outlet conduits for S-shaped shaft extension tubular pumping system, the three dimensional steady turbulent flow in pumping system was simulated using computational fluid dynamics technology. The experiment results are compared with the CFD results. The hydraulic performance parameters of inlet and outlet conduits were analyzed quantitatively considering the hydraulic interaction of conduits and impeller. The change trend of relationship curves between hydraulic loss ratio value and flow rate coefficient is same in different rotational speed. With the increase of flow rate coefficient, the hydraulic loss ratio value increases gradually, the hydraulic efficiency increases firstly then decreases gradually, and the average velocity circulation of outlet section increases firstly then decreases gradually in the same rotational speed. With the increase of rotational speed, the average velocity circulation increases gradually in the same flow rate coefficient. With the increase of flow rate coefficient, the relative swirl angle decreases firstly then increases in different rotational speed. With the increase of rotational speed, the static pressure ratio of outlet conduit increases gradually, and the distribution of drift angle in inlet section of outlet conduit is same. There is no linear functional relationship between the square of hydraulic loss and flow rate for outlet conduit.