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reaction turbine

 reaction turbine

  • The axial-flow reaction turbine is the most widely used turbine. In a reaction turbine, both the nozzles and blades act as expanding nozzles.
  • Therefore, the static pressure decreases in both the fixed and moving blades. The fixed blades act as nozzles and direct the flow to the moving blades at a velocity slightly higher than the moving blade velocity.
  •  In the reaction turbine, the velocities are usually much lower, and the entering blade relative velocities are nearly axial.
  • Figure 9-10 shows a schematic view of a reaction turbine.In most designs, the reaction of the turbine varies from hub to shroud.
  • The impulse turbine is a reaction turbine with a reaction of zero (R = 0). The utilization factor for a fixed nozzle angle will increase as the reaction approaches100%.
  •  For R = 1, the utilization factor does not reach unity but reaches some maximum finite value.

reactions :