Abstract
The swirl flow is generated by rotating runner into a draft tube of a hydro turbine, effects on the performance of the turbines. Due to various operating conditions of a hydro turbine, the variation of swirl intensity causes flow instabilities in the draft tube. Therefore, J-Groove is a group of grooves usually mounted on the draft tube wall of a hydro turbine, is considered for suppressing swirl flow in the bulb turbine model. The influence of the J-Groove on the turbine’s performance and pressure pulsation were examined by CFD analysis in the first step. Then, the optimum design of J-Groove will be conducted while considering dimensions as the length ratio, the depth ratio, the angle and the number of grooves in next step. The swirl number was evaluated in the draft tube at various operating conditions to figure inspect the effect of J-Groove to the main flow in downstream of the turbine model. The FFT analysis was employed to analyse the pressure pulsation of the flow in the draft tube of the turbine model.
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