INVESTIGATION OF DOUBLE MOTION PRINCIPLE IN AXIAL MULTISTAGE TURBOMACHINES.

Abstract

This paper presents the investigation of the characteristics of axial double motion turbo machines by the method of equivalent replacements.'* The system of expressions formulated in reference (2) is used for this investigation. Typical schemes are analysed and power coefficients evaluated for comparison with axial single motion turbomachines. It is illustrated that the double motion adoption can intensify the force coefficient, hence the power output and lessen the number of stages for a given total enthalpy drop. However it is illustrated that double motion principle can also weaken the force coefficient, if certain forms of mathematical profiles are adopted for the blading. Investigations so far presented have been particular cases of axial double motion turbomachine. The method of equivalent replacements makes it possible to investigate the general cases, as presented in this paper.