Bokova T.A., Bokov P.A., Lvov A.V., Volkov N.S., Marov A.R.
Nizhny Novgorod State Technical University n.a. R.E. Alekseev, Nizhny Novgorod, Russia
This work is devoted to the design problems
of axial flow pumps intended for pumping lead coolant associated with the
physical and physicochemical characteristics of this coolant in comparison with
traditional ones, such as water and sodium. Calculation methods used in the
design of pumps require modifications and a large array of experimental data
that will justify the applied technical solutions and adapt traditional
calculation methods. One of the problems is the lack of the ability to
analytically assess the effect on the operation of the system of such a factor
as the non-wettability of the surfaces of structural materials with lead, which
does not allow, using existing modeling methods, to adequately obtain a picture
of the movement of lead in the interscapular channels. In connection with this
in the laboratory “Reactor hydrodynamics” NSTU n.a. R.E. Alekseev, experimental
studies of the dependence of the characteristics of axial pumps for pumping
lead coolant on the geometric characteristics of the main elements of the flow
path of the pump, affecting the energy characteristics of pumping equipment
were carried out. The results of the following experimental studies are
presented: 1) the parameters of the straightening devices installed at the
outlet and inlet of the flow to the impellers, 2) swirling of the flow at the
inlet to the impeller relative to the direction of rotation of the pump
impeller, 3) the parameters of the impeller profile lattice, 4) changes in the
angle attacks relative to the angle of installation of the profile lattice
vane, 5) the geometry of the outlet section of the impeller profile lattice
vanes, 6) the bushing ratio of the impeller. The obtained array of experimental
data can be recommended for use to amend the existing design techniques for
pumps for pumping heavy liquid metal coolant.
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