| 摘要 |
FIELD: electrical engineering; MHD equipment. ^ SUBSTANCE: method consists in determination of stable and unstable operation zones of cylindrical linear induction pumps with three-phase excitation winding having a flat-wave linear current characteristic. Coils of the excitation winding have a constant number of turns throughout the length of the inductor and create a traveling variable magnetic field within a cylindrical liquid metal channel operating at a magnetic Reynolds number Rm>l and having an approximate boundary between stable and unstable operation zones. These zones are determined by the point of intersection of two modified parameters: magnetohydrodynamic interaction alphaRN and magnetic Reynolds number alphaRm. The point of intersection of said parameters is applied to the plane of a curve being deduced from experiments alphaRN=f(alphaRm). Moreover, if said point is situated below the curve then the pump operates stably, and if it is above the curve then the pump operates unstably, wherein - magnetic Reynolds number, , R - magnetohydrodynamic interaction parameter, - average radius of pump channel, tau- pole pitch, s - slip, mu - liquid metal magnetic permeability, sigma -liquid metal electric conductivity, omega=2pif - circular frequency, b -height of the liquid metal channel, delta' - equivalent height of the nonmagnetic gap, mDelta - magnetic field induction in the middle of the channel, gamma - liquid metal density, vs=2tauf - synchronous velocity of the traveling magnetic field. ^ EFFECT: ability to choose a working point of the pump in the region of absence of low-frequency pulsations having higher efficiency and reliability. ^ 8 dwg |
