Experimental researches of dependences of lead coolant axial pumping on the lattice parameters of impellers profiles
The paper presents the results of experimental researches of dependences of axial pump characteristics (flow, pressure and efficiency) in the lead coolant on the lattice parameters of impellers profiles, including the number of blades, the installation angle of the profile in the lattice and lattice density.
The researches were carried out as applied to the conditions of low and medium power fast neutron reactors cooled by lead-cooled horizontal steam generators (FRL HSG). Engineering solutions of such facilities are worked out at the Nizhny Novgorod State Technical University (NNSTU).
The experiments were carried out on the FT-4 NNSTU test-bench (facility) at 440–500°C of lead coolant. The number of blades in the form of flat plates during the research process was 3, 4, 6, and 8; the installation angle of the blades in the lattice was varied from 9 to 43°; lattice density (0.6–1.2) was modified by means of changing the chord length of the blade profile. Rotation speed of the pump PLA-01 NNSTU, on which changeable impellers have been installed, was varied in steps of 100 r/m from 600 to 1100 r/m. The diameter of blades was about 200 mm, the maximum lead coolant flow in the researches was about 2000 t/h. The characteristics of twenty seven changeable impellers were investigated. The goal of the present study was to determine the characteristics of the pump (feed pressure and efficiency) installed in the circulation circuit with lead coolant depending on the parameters of grating profiles: setting angle of the blades in the profile (α), the number of blades (Z), density arrays (l/t) when a step change the pump shaft rotational speed (n). Further, it is expected to conduct similar studies on the experimental determination of the optimum performance of the rectifying unit.
The obtained results are recommended for use in the design of axial pumps pumped HLMC.
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