2.2.7. Sizing of the Final Diffuser

It has been assumed that the length of the final diffuser, *Ld*, can be assumed to be equal to the difference between the height *h*<sup>2</sup> (distance between the axis of the pump and the discharge flange) and the radius *r*2. It was therefore possible to dimension the output section of the final diffuser using the following expressions:

$$b\_5 = h\_5 = 2\ L\_d \ \tan(a\_d) + b \tag{46}$$

$$A\_5 = b\_5 h\_v \tag{47}$$

The half-opening angle of the diffuser *α<sup>d</sup>* is set equal to 3.5 degrees in such a way as to ensure that fluid vein detachment does not occur.
