Partial steam admission in an axial turbine stage
Published March 02, 1999 by Institution of Mechanical Engineers in United Kingdom
Some results are presented here of an experimental research work on steam and air turbines, which was focused on the clarification of the processes developing in an impulse axial turbine stage with partial steam admission. The effects of axial distance, the velocities ratio, the Mach number, the admission rate and other parameters on the stage efficiency were investigated. Simulation of the steam flow through the stage was performed by computation. Computation enabled better understanding and clarification of those processes, which occur at the moment of the moving blades transition into the blocked part of the stage. Measurement on two experimental turbines enabled the comparison of the results in wide range of Mach numbers and axial distances. Analysis of the measured data was performed and the influence of ventilation losses was separated.