Question 14.6: Preliminary Design of a Centrifugal Pump A centrifugal pump ...
Preliminary Design of a Centrifugal Pump
A centrifugal pump is being designed to pump liquid refrigerant R-134a at room temperature and atmospheric pressure. The impeller inlet and outlet radii are r_{1}=100 \text { and } r_{2}=180 mm , respectively (Fig. 14–42). The impeller inlet and outlet widths are b_{1}=50 \text { and } b_{2}=30 mm (into the page of Fig. 14–42). The pump is to deliver 0.25 m³/s of the liquid at a net head of 14.5 m when the impeller rotates at 1720 rpm. Design the blade shape for the case in which these operating conditions are the design conditions of the pump ( V_{1} , t = 0, as sketched in the figure); specifically, calculate angles \beta_{1} \text { and } \beta_{2} , and discuss the shape of the blade. Also predict the horsepower required by the pump.
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