Читать книгу Hydraulic Fluid Power - Andrea Vacca - Страница 73

1 1 A significant exception to this statement is the analysis of suction conditions at the inlet of hydraulic pumps. Considerations on the suction ability of pumps as well as the occurrence of gaseous or vapor cavitation should be taken into account when determining the elevation of the reservoir with respect to the inlet port.

2 2 In the literature, it also common to find the hydraulic resistance generally defined aswhich implies a linear relationship between flow rate and pressure drop. This will be the case of the laminar hydraulic resistance. In this book, the authors choose to distinguish the case of laminar hydraulic resistance from the case of turbulent hydraulic resistance.

3 3 This is not exactly true for the exit section 2, as shown in the detail of the figure. However, it is usually a good approximation also because of the low velocity values that are typically present at the vena contraction.