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Abstract: On
the basis of the area ration principle, the calculation formulae of
area ration for the centrifugal pump are deduced, which incarnate the
relation between the area ration and the hydraulic parameter of the
impeller and volute. The calculation method and formulae of the area
ration and the eighth volute cross area for low specific speed
centrifugal pump are proposed after increasing the flow-rate, which
relate the area ration and the eighth volute cross area to the
increasing coefficients of the flow-rate and the specific speed and the
hydraulic parameter of the impeller and volute. It is resolved that
design condition efficiency for low specific speed centrifugal pump is
not the highest in terms of experiential statistical area ration value.
The example indicates that the method proposed is practicable, which can
enhance the efficiency of low-specific speed pump at design condition.
The design theory of low specific-speed centrifugal pump is further
enriched.
Key words: Low
specific-speed centrifugal pump Efficiency Increasing coefficients
Volute Area ration
CLC No: TH311
甘肃省自然科学基金资助项目(ZS022-A25-028).
Received
20051013, received in revised form 20060427
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