The experimental rig was a closed loop arrangement where a
head tank contains the working fluid which in this case was
water.The pump itself was driven by a 3 kWinductionmotor to
operate at a constant speed of 3,000 rpm. The motor was
connected to a dynamometer containing a load cell to accurately
measure the input torque to the impeller for calculating the
pump efficiency. The fluid flowrate was determined by a flow
control valvemetering the flowto a degree necessary to produce
a running characteristic. This allowed a range of possible flows
to be measured using a hall effect turbine flowmeter at a
constant running speed (Figure 3).
The test procedure was to measure input power, suction
pressure and discharge pressure over a range of flowrates. The
test impeller was a 30 bladed impeller of width 1.3mm and
diameter 74.5mm. The impeller was a double suction shape
designed with alignment of the blades to balance axial thrust
(Figure 4). In this design the impeller had radial teeth or
vanes machined into each side at its periphery.
The fluid entered both sides of the impeller through a
suction port making the unit a double suction unit. The
casing had a barrier wall “stripper” through which the
impeller passes with close clearance (Figure 4). The stripper
seperates flow between suction and discharge and the length
of this barrier was equal to at least two blade pitches. The
angle between the inlet and outlet ports, known as the
“stripper angle”, was 308 in the test case. When the stripper
angle is small, more work is done on the fluid due to the
increased pumping region, but the leakage flow through the
stripper gap from the outlet to inlet is increased.Design of the regenerative pump impeller
The regenerative pump uses an impeller with Turbine-type
blades mounted on the periphery running in an annular
channel surrounding the periphery of the wheel. In the design,
the impeller has radial teeth machined into the impeller
periphery and the fluid passes through an open annular
channel and circulates repeatedly through the impeller vanes
(Figures 1 and 4).
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