On-cam operating characteristics of draft tube of tubular turbine based on vortex field analysis

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

Li, Z.G.^1,2 ; Wang, S.S.^1 ; Wei, X.Z.^2 ; Li, F.C.^3

Key Laboratory of Fluid and Power Machinery, Ministry of Education, Xihua University, Chengdu

610039, China^1

Key Laboratory of Hydropower Equipment, Harbin Research Institute of Large Electrical Machinery, Harbin

150040, China^2

Energy Science and Engineering School, Harbin Industry University, Harbin

150001, China^3

关键词: Evolution characteristics;    Guide vane openings;    Operating characteristics;    Operating condition;    Pressure pulsation;    Vortex energy;    Vortex field;    Water turbines;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/163/1/012122/pdf
DOI  :  10.1088/1755-1315/163/1/012122

来源: IOP

【 摘 要 】

In order to improve the efficiency of water turbine and the stability of the unit, numerical simulation is carried out for the draft tube of tubular turbine, The evolution characteristics of the vortex belt under different working conditions and the variation rule of the enstrophy and pressure pulsation are obtained. The results show that the kinetic energy of the fluid is affected by the enstrophy, and the rotation vortex belt is related to the flow energy in the tail water flow path, so the rotation vortex belt is closely related to the enstrophy. With the increase of the draft tube guide vane opening, the vortex belt with obvious changes, when the guide vane opening is large, that is close to the on-cam operating condition, in the center of the tail water flow path shows a whole vortex runner, at that time the tail water energy recovery is the best. The efficiency of water turbine is the best. The trend of vortex energy and pressure pulsations shows the opposite variation, so there is a certain correlation between the enstrophy and the pressure pulsation.