Author(s): Y L Xu; D Q Qin; Y Zhao; X C Meng

Linked Author(s):

Keywords: Francis turbine; Draft tube; Pressure fluctuation; Similarity

Abstract: 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.

DOI: https://doi.org/10.1088/1755-1315/163/1/012062

Year: 2017