Impeller for a hydraulic fluid flow machine according to francis - design

摘要

The paddle wheel for a hydraulic flow machine, especially a water turbine, has a wheel base (1.1), a wheel crown (1.2) and a number of paddles (1.3), each of which has an entry edge (1.3.1) and an outlet edge (1.3.2). Each outlet edge (1.3.2) has deflection at point (C) near the wheel base (1.1) to run (1.3.3) on the base (1.1) to meet a point (B) which is opposite to, and downstream from, the point (A) where the outlet edge (1.3.2) would meet the wheel base without any deflection. The deflection line between points (B,C) is straight, concave or convex.