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A Study on the Effect of Port Area of Blade on the Performance of Francis Hydro Turbine
천쩐무,최영도 한국유체기계학회 2016 한국유체기계학회 논문집 Vol.19 No.1
As a key component of a Francis turbine facility, the runner performance plays a vital role in the performance of the turbine. It is effective and successful to design a Francis turbine runner blade with good performance by one dimensional hydraulic design method. On the basis of one dimensional hydraulic analysis, there are a lot of parameters of the internal flow passage shapes determined by experience. Among those parameters, the effect of port area of blade on the performance of a Francis turbine is investigated in this study. A given Francis turbine model was selected for investigating the port area of blade on the performance. The result shows that the effect of port area of runner blade on the outflow angle from runner passage on the performance is quite significant. A correct exit flow angle reduces the energy loss at draft tube, which has the best efficiency of the turbine model.
Effect of the Hub to Tip Diameter Ratio to the Performance of a Bulb Hydro Turbine Model
부비엣루옌,천쩐무,최영도 한국유체기계학회 2019 한국유체기계학회 논문집 Vol.22 No.3
The hub to tip diameter ratio (HTR) is one of the important factors that affects the performance of a bulb turbine. However, studies on this parameter are limited. Understanding the influence of the parameter on the performance of a bulb turbine can provide designers with useful information to improve turbine performance. Therefore, this study investigates the effect of HTR on the performance of a bulb hydro turbine model using CFD analysis. The performance characteristics of the bulb turbine model demonstrated that the turbine discharge decreased by 1.86%, the turbine hydraulic power decreased by 1.3%, and turbine efficiency maintained at the local maximum efficiency point condition when the HTR increased from Case 1 to Case 2. The results of loss analysis indicated that only different hydraulic loss between Case 1 and Case 2 came from the change in the HTR. An analysis on internal parameters, namely, cross-sectional area, axial velocity, change in the circumferential velocity through the runner domain, and hydraulic loss in the runner domain of both cases was performed to understand the turbine performance with varying HTR.