(like specific speed and specific diameter) to map the performance of virtually all machine types. Breadth of Content
| Parameter | Turbine Selection | Pump/Compressor Selection | | :--- | :--- | :--- | | | High Q → Axial (Kaplan) Low Q → Pelton | High Q → Axial Low Q → Reciprocating (positive displacement) or centrifugal | | Head (H) | High H (>300m) → Pelton Medium (50-300m) → Francis Low (<50m) → Kaplan | High H → Multistage centrifugal Low H → Single stage axial | | Fluid Properties | Clean water → Any turbine Sediment-laden → Pelton (no submerged parts) | Clean fluids → High speed centrifugal Viscous fluids → Positive displacement | turbomachines a guide to design selection and theory pdf
A core concept in turbomachinery theory is the construction of velocity triangles. At the inlet and outlet of a rotor, vectors representing the fluid velocity are drawn to visualize the relationship between: (like specific speed and specific diameter) to map