Study of dynamic characteristics of flow in plane-parallel and taper clearances of drives of electric power systems

Abstract

The hydrodynamic parameters of the flow of a viscous working fluid in plane-parallel and conical gaps in drives of electric power systems are investigated. A general expression is found for determining the regularity of the change in the flow rate in the gaps of non-contact seals, and special cases are considered. In the case of frictional movement of one of the walls, the Couette flow is observed in the gap. When the pressure is applied to the liquid in the gap, a parabolic velocity distribution is observed with a maximum in the middle of the channel. Under the joint action of the frictional movement of the wall and the pressure flow in the channel, stratification of fluid movement in opposite directions is observed. Frictional flow in conical slots, when the fluid moves in only one direction, is possible at a taper value of -0,5...1,0. In all other cases, the flow in the slot will have two opposite flow directions. The presence of two opposite flows inside the slot can also be for the case when the direction of movement of the movable wall coincides with the direction of the pressure flow. This is caused by an increase in pressure within the gap. A general solution has been found for the pressure force in the gaps, which tends to push the walls apart, i.e. open the sealing surfaces. The analysis of the pressure force is carried out for various cases of the slotted gap and under various effects of the frictional flow and pressure head.