INTRODUCTION OF HYDRAULIC MACHINES :
Every common turbomachine contains a rotor upon which blades are mounted, only the detailed physical arrangements differ. Fluid flows through the rotor from an entrance to an exit submit a change in momentum during the process because of the torque exerted on or by rotor blades.
Throughout this text, the emphasize has put on the practical aspects of the machines without going deep inside the mathematical formulation. Some important applications are treated separately as; cavitation phenomena, pressure recovery devices and maintenance of turbomachines.
The turbomachines can be classified by the energy transfer principle :
1.Turbines, energy transfers from the fluid to the rotor. 2. Pumps, energy transfers from the wheel to the fluid.
The rotors also can be classified by the direction of flow in the wheel :
1. Radial Wheel
2. Axial Wheel
3. Mixed Wheel