|
Abstract: On the basis of the traditional formulae for the width of
impeller and the specific-speed, the formulae of the increasing
coefficients of the flow-rate, head and the specific-speed are deduced,
which incarnates the relation between the increasing coefficients and
the hydraulic parameter of the pump. The calculation method of the
increasing coefficients for low specific speed centrifugal pump is
proposed, based on performance prediction of centrifugal pump. The
problem is resolved, which design condition efficiency for low specific
speed centrifugal pump is not the highest in terms of experiential
statistical increasing coefficients. 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 Increasing
coefficients Design condition Efficiency
CLC No: TH311
甘肃省自然科学基金资助项目(ZS022-A25-028).
Received 20040601, received in revised form 20041120
|