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.

For this case, we remove the inlet housing entirely, and replace it with a straight tube that is concentric with the impeller inlet.  The tube transitions smoothly to an annulus that matches the annulus of the impeller.

The point of this case is to eliminate all inlet losses possible and provide a basis for determining the performance penalty of suboptimal inlet designs. The impeller, volute, and outlet duct portions of this case are identical to the Baseline case.
 

• View the Geometry of the pump.
• View the Mesh of the Pump

• 0kPa
• 75kPa
• 175kPa

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 at 175kPa

Flow distribution in the volute is quite uniform for the 175 kPa case

Mass flow from one blade passage to the next is not as uniform for the 75 kPa case, but more uniform than the Baseline case.

Pressure minimum in the blade passage near the cutoff causes weak cavitation for the 75 kPa case (an inlet gauge pressure of 45kPa).

Flow distribution in the volute is not uniform for the 75 kPa case; the flow accelerates near the outlet.

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