💧 Francis Turbine Setting Height: Thoma Sigma, NPSH and Cavitation (2D)

Side view of a Francis turbine runner above the tailwater with its draft tube, next to a bar chart of the pressure heads that decide whether the water boils at the runner outlet. Set the head, flow, speed, runner height, site altitude, water temperature and draft tube shape, and see the specific speed, the critical Thoma number, the available and required NPSH, the highest safe runner height and bubbles when the margin is negative. Reference atmosphere and vapour pressures, similarity of specific speed, the setting limit and the diffuser pressure recovery are checked numerically, with four in-page numerical checks.

2D · HTML5 Canvas 2D · 60 FPS target · runs fully client-side, no install