Research of runner optimization of small hydropower tailrace turbine
[Objective]In order to solve the problem of poor performance and low operating efficiency of the draft turbine in the actual small hydropower station project and alleviate the cavitation of the runner blade,[Methods]two kinds of turbine optimiza-tion schemes with the tilt angle of the runner blade of 30°and 45°were designed.Based on the ANSYS simulation calculation soft-ware,the two runner design schemes were numerically calculated under the design conditions,and the flow field flow pattern and modal distribution calculation result were compared.According to the overall streamline distribution,velocity distribution,pres-sure distribution and vortex cloud map of the rotor area of the calculation result of the two programs to carry out the flow analysis,and dry and wet modes of the vibration mode comparison analysis.[Results]It was found that under the design conditions,the overall flow pattern of scheme 2 was more stable,the pressure distribution in the runner area was more uniform,the vortex was less,and there is still a difference of 40％in the value of the closest vibration frequency in the first five orders of the resonance frequency of the pre-stressed wet modal,and no resonance phenomenon occurred,indicating that its overall performance was bet-ter.[Conclusion]The research result show that the numerical simulation method is reasonable,the modal analysis is consistent with the research result of the industry scholars,and the credible data can be obtained.Through the design optimization of the runner,the anti-cavitation and anti-vibration performance of the turbine can be improved,which provides a useful reference for the optimization design of the draft turbine of the small hydropower station,and also provides an effective theoretical support for the transformation of similar engineering problems.
small hydropowerrunner optimizationflow analysismodal analysisresonancenumercial simulation
万方数据
维普
