Rothalpy Based Design of Turbines

1. Rothalpy Based Design of Turbines P M V Subbarao Professor Mechanical Engineering Department I I T Delhi A Design Philosophy through Accounting/Balancing/ Conservation ….

2. Conservation of Rothalpy A cornerstone of the analysis of steady, relative flows in rotating systems has, for many years, been the immutable nature of the fluid mechanical property rothalpy. "In a moving passage (Flow Path) the rothalpy is therefore constant provided: the flow is steady in the rotating frame; no friction from the casing; there is no heat flow to or from the flow. or

3. Clues for Creation of Basic Variations in Fluid Flow Paths Infusion of more Euler concept: Ideas for creation of a variety in turbo-machine.

4. Blade Velocity Vs Tangential Component of Fluid Velocity Ub Ub In maridional plane at mean radius of rotor Vi Vri Vfi Vai

5. Vi Variations in Inlet Flow Geometry Vri Vfi Vai Vi Vri Vi Vai Ub Vfi Ub Ub Vfi Vri Vai

6. Relative Angular Velocity Constant in an ideal turbo-machine

7. Behavior of Fluid along Flow Paths in Stator Vs Rotor For stator Ublade =0 For rotors : For a true axial flow machines: Ubladeconstant throughout the flow path

8. Blade Velocity Vs Tangential Component of Fluid Velocity Ub Ub In maridional plane at mean radius of rotor & inlet Vi Vri Vfi Vai

9. V  i Vri Vfi Vai V  i Vri V  i Vai Ub Vfi Ub Ub Vfi Vri Vai

10. Relative Angular Velocity Constant in an ideal turbo-machine

11. Evolution of Relative Velocity Along Flow Path

12. Classification of Isentropic Expansion Paths For stator path : Ublade =0 For rotor Paths : For a true axial flow rotor paths: Ublade constant

13. Turbo-machines working with Vapors/Gas For an ideal gas:

14. Turbo-machines working with Perfect Gas For simple compressible fluid: Like Inert Gas

15. The Fourth Generation Nuclear Power Plants

16. An Advanced Nuclear Power Plant

17. The Ultimate Importance of Invariant Property : Rothalpy

18. Selection of Stator-Rotor Combinations

19. From Books of Sir Charles Parson • In 1884 or four years previously, I dealt with the turbine problem in a different way. • It seemed to me that moderate surface velocities and speeds of rotation were essential if the turbine motor was to receive general acceptance as a prime mover. • I therefore decided to split up the fall in pressure of the steam into small fractional expansions over a large number of turbines in series, so that the velocity of the steam nowhere should be great. • A moderate speed of turbine suffices for the highest economy.

20. This principle of compounding turbines in series is now universally used in all except very small engines, where economy in steam is of secondary importance. • The arrangement of small falls in pressure at each turbine also appeared to me to be surer to give a high efficiency. • The steam flowed practically in a non-expansive manner through each individual turbine, and consequently in an analogous way to water in hydraulic turbines whose high efficiency at that date had been proved by accurate tests.

22. Classification of Steam Turbine Flow Paths

23. Selection of Stator-Rotor Combinations

24. Enthalpy How to Execute Conservation of Rothalpy ?? Kinetic Energy Velocity Vector Field Fluid Dynamics Generation of Change in rate of angular momentum (An Action) Shaft Torque is the final need as Reaction Who Will take the Reaction ???