2.2.5. Calculation of the Blade width at the Outlet

The height *b*<sup>2</sup> of the unloading blades was obtained after defining the value of flow or flow coefficient, *φ*. The value of this coefficient is chosen from a statistic diagram whose use presupposes the knowledge of the specific speed and of the number of blades *z*. The height of the blade is obtained through the expression

$$b\_2 = \frac{Q}{\mathcal{Q}\left(\pi d\_2 - \frac{z t\_2}{\sin\left(\beta\_{2p}\right)}\right)}\tag{38}$$

The thickness of the blades, *t*2, was assumed to be 4 mm.
