Abstract
Among several different measurement techniques that have been already performed and presented in a radial impeller pump model including PIV, a directional pressure probe has been used to obtain mean velocity field and stagnation pressure between impeller outlet and the inlet vaned diffuser sections. These measurements are supposed to get more information not only about global pump head coefficient including vaned diffuser ones but also about impeller performances itself. Pressure probe information is affected by rotor-stator interactions and impeller rotation, and this paper presents a way to explain and correct pressure probe indications in order to achieve a better evaluation of overall impeller mean performances. The use of unsteady RANS calculation results is found to be a useful way to perform better data reduction analysis for this purpose.
Highlights
Hydraulic radial pump is often design including vane diffuser downstream the impeller
Impeller performance itself is usually determined by torque measurements and by wall static pressure at impeller outlet section assuming mean radial and tangential velocity components coming from mass flow rate and mean slip factor coefficient
It has been already show in previous papers, references [1], [2] and [3], that rotor stator interactions are quite important, even at design point, due to the particular design of the diffuser vanes
Summary
Hydraulic radial pump is often design including vane diffuser downstream the impeller. These effects generally lead to higher total pressure probe levels compared with real ones even for the case where no absolute angle variation in time are present.
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