A waterpump for a 7L deisel engine application has inspired this study.  The baseline design fits between the gear cover on the front of the engine and the radiator fan, a rather narrow space.

The impeller diameter is 9.4 cm (3.7 in).  The blades are 1.2 cm (0.5 in) tall.  The inlet housing's fluid volume is 1.8 cm (0.7in) thick with the master inlet offset from the impeller inlet.   The volute is 1.9 cm (.75 in) deep.  The thickness of the entire pump is 4.4 cm (1.7 in).

The pump has a design goal of 4.5 to 5 Liter/sec at a pressure head of 175 kPa.

• View the Geometry of the pump.
• View the Mesh of the pump.
• View the Mesh of the Volute and Impeller.

• 75 kPa
• 175 kPa
• 212 kPa

• Mass flow from one blade passage to the next is quite uniform for the 175 kPa case
• Pressure distribution in the impeller is radial; there is little variation from one blade passage to the next
• Mass flow from one blade passage to the next is not uniform for the 75 kPa case
• Pressure minimum in the blade passage near the cutoff causes strong cavitation for the 75 kPa case (an inlet gauge pressure of 45kPa).
• Flow distribution in the volute is much more uniform for the 175 kPa case than for the 75 kPa case.  This is the same trend as seen in the Simplified Inlet, but the opposite trend seen in the Volute A case.