OPTIMIZATION OF POWERFUL TWO-STAGE SCREW CENTRIFUGAL PUMP

Optimization of Powerful Two-stage Screw Centrifugal Pump

The article presents a refining method for a two-stage screw centrifugal pump by the joint Pyruvate usage of mathematical optimization software IOSO, meshing complex NUMECA and CFD software ANSYS CFX.The pump main parameters: high-pressure stage rotor speed was 13300 rpm; low-pressure rotor speed was 3617 rpm by gearbox; inlet total pressure was 0.

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Stratification of populations with skewed distribution

The Dryer Decal problem of efficient stratification in the case of skewed population is considered.Four stratification methods are examined.A new adjusted geometric stratification method is introduced.This method is compared by simulation with the Dalenius-Hodges cumulative root frequency method, the geometric method proposed by Gunning and Horgan

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