Similarity research of Francis turbine draft tube pressure fluctuation

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

Xu, Y.L.^1,2,4 ; Qin, D.Q.^1,2 ; Zhao, Y.^1,2 ; Meng, X.C.^3

State Key Laboratory of Hydro-power Equipment, Harbin City

150040, China^1

Harbin Electrical Machinery Company Limited, Harbin City

150040, China^2

China Institute of Water Resources and Hydropower Research, Beijing

100038, China^3

HADONG National Engineering Research Center-Hydropower Equipment Company LTD, Harbin City

150040, China^4

关键词: Draft tubes;    Model test datum;    Pressure pulsation;    Prototype data;    Qualitative analysis;    Site tests;    Statistic method;    Velocity head;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/163/1/012062/pdf
DOI  :  10.1088/1755-1315/163/1/012062

来源: IOP

【 摘 要 】

In this paper, it presented the similarity research of Francis turbine draft tube pressure fluctuation between model turbine and the corresponding prototype. First, a qualitative analysis was made by runner outlet triangle velocity. Then a comparison was made between popular method and the method recommended by this paper which based on relative discharge taken zero swirl discharge as reference and dimensionless pressure pulsation amplitude taken runner outlet blade velocity head as reference respectively on model and prototype. Also a comparison of draft tube pressure fluctuation was made between model test data and prototype data from 12 power plants based on this method respectively. It had shown some similarity between model turbine and homologous prototype and had given the similarity range by statistic method. At last, a method was given concerning prototype draft tube pressure fluctuation amplitude prediction and a comparison was carried out between prediction results and site test results. It fitted very well which can prove the feasibility of this method.