THE NORMAL RULE OF "LEADING AND LAGGING VECTORS" AND DEVIATIONS FROM THIS RULE IN AN AXIAL TURBOMACHINE STAGE

Abstract

In early papers the normal rule of to leading and lagging vectors describing the operational regime of a turbomachine stage has been formulated and used. The rule refers to the behaviour of the vectors e, w while they turn in the plane of velocity hodographs. The normal rule has to be examined for its possible deviations, which characterise operational process of a turbine or compressor stage weakened or strengthened intentionally or otherwise. It is necessary to keep to the normal rule of leading and lagging vectors while designing a turbo machine stage, although the deviations can manifest themselves under conditions of variable regime even in the stage designed for a certain regime subject to the normal rule. The possible deviations of the normal rule are discussed in this paper.