The shaft tubular turbine is a form of tidal power station which can provide bidirectional power. Efficiency is an important turbine\r\nperformance indicator. To study the influence of runner design parameters on efficiency, a complete 3D flow-channel model of a\r\nshaft tubular turbine was developed, which contains the turbine runner, guide vanes, and flow passage and was integrated with\r\nhybrid grids calculated by steady-state calculation methods. Three aspects of the core component (turbine runner) were optimized\r\nby numerical simulation. All the results were then verified by experiments. It was shown that curved-edge blades are much better\r\nthan straight-edge blades; the optimal blade twist angle is 7Ã?°, and the optimal distance between the runner and the blades is 0.75ââ?¬â??\r\n1.25 times the diameter of the runner. Moreover, the numerical simulation results matched the experimental data very well, which\r\nalso verified the correctness of the optimal results.
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