Question

(c) (4 pts) Give the fractional drop of the following quantities across the nozzle in a 50% reaction turbine: i. the static enthalpy h, and ii. the stagnation enthalpy ho.

This was given but I don't know if it would be helpful for this problem

Answer 1

solution (1) Given Reaction turbine with 50% of reaction degree tu= 15ombs- Wz B2 (2 Bs Les can fig: Given figure The degree of reaction in a reaction turbine be described as the ratio in rotor to the static enthalpy drop across the stage. of static en enthalpy drop in rotor Rd (dh) rotor (da) static & (dhrotor Now for 50% degree of reaction , hogy half the enthalfy

of the drop and (2) stage occurs in the fixed blades (de) moving blades. It means fractional droß for static en (h) is 50%. half in the enthalfy by unit mass the fluid the The work done on the reator of fluid, the specific work, equals the stagnation enthalpy drop incurred fluid fasing passing through stage from the Euler work. AW= lilin = (horhol W, (C, +(2) Since so work is done in the nozzle row, the nation enthalf đa remains constant. Cho'cho) the rotor and stater Also for 50% degree of blade shape become symmetrical lie (=B). And for such condition (ah) rotor = (ch) stator. degree of reaction Comment , for 50% degree of reaction; the Reaction Turbine is Known as Parson's Tweline. for Impulse Turbine reaction is zero.. the degree of reaction