For Parson’s Reaction Turbine Degree of Reaction is

By BYJU'S Exam Prep

Updated on: October 17th, 2023

For Parson’s Reaction Turbine Degree of Reaction is. A reaction turbine is a combination of rows of blades that are fixed as well as moving. Blades that are moving cause a change in momentum or expansion of steam relative to them. Read below for a detailed explanation.

For Parson’s Reaction Turbine Degree of Reaction is

A reaction turbine is a combination of rows of fixed and moving blades. Here, the moving blade causes the change in momentum or expansion of steam relative to them. Whereas, the fixed blades are act as a nozzle. There is a typical fixed and moving blades arrangement in the reaction turbine. The schematic pressure line shows that pressure continuously drops through all rows of blades. In a reaction turbine, pressure and enthalpy drop both in the fixed blade or stator and in the moving blade or Rotor.

The degree of reaction of a turbine is given as:

Degree of Reaction = Enthalpy Drop in Rotor/Enthalpy Drop in Stage

Here, the enthalpy drop in a stage is the summation of the enthalpy drop in the stator and rotor, both.

A very widely used design has a half degree of reaction or 50% reaction, and this is known as Parson’s Reaction Turbine. This consists of a symmetrical stator and rotor blades.

SUMMARY

For Parson’s Reaction Turbine Degree of Reaction is?

Degree of freedom is a term which is used to define the contribution of static pressure drop in the rotor to the total static pressure drop in a stage of the turbine. For a pure impulse turbine, there is no change of static pressure over the blades; thus, the degree of reaction for a pure impulse turbine is zero. In the case of a Kaplan turbine, it lies between zero to one.

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