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Fluid Dynamics to Create High Performance Steam & Gas Turbines

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Presentation on theme: "Fluid Dynamics to Create High Performance Steam & Gas Turbines"— Presentation transcript:

1 Fluid Dynamics to Create High Performance Steam & Gas Turbines
P M V Subbarao Professor Mechanical Engineering Department Realization of Thermodynamic Understanding ……

2 Advanced 700 8C Pulverised Coal-fired Power Plant Project

3 Some Facts about Advanced Steam Turbines

4 Increased Magnitudes of Forces

5 The First Proposal on Infrastructure for Realization of Newton's’ Laws
Stator Rotor

6 Axial Turbine Stator Exit/Rotor Inlet Velocity Triangle
Va1 Va1 Vw1 Vr1 a1 a1 Vw1 b1 Vf1 Vf1 Va0 Vf0

7 U Vr1 Va1 Inlet Velocity Triangle Va1 Vr1 U Exit Velocity Triangle U Vr2 Va2 Vr2 Kinematics of Flow Past A Rotor Blade

8 U Vr1 Va1 Vr2 Va2 b1 a1 a2 b2 Va1: Inlet Absolute Velocity Vr1: Inlet Relative Velocity Vr2: Exit Relative Velocity Va2:Exit Absolute Velocity a1: Inlet Nozzle Angle. b1: Inlet Blade Angle. b2: Exit Blade Angle. a2: inlet Nozzle Angle (next stage).

9 U Vr1 Va1 b1 a1 Va2 a2 Vr2 b2 Newton’s Second Law for an Impulse Blade: The tangential force acting on the jet is: F = mass flow rate X Change of velocity in the tangential direction Change in velocity in tangential direction: -Vr2 cos(b2) – Vr1 cos(b1). -(Vr2 cos(b2) + Vr1 cos(b1)). Tangential Force,

10 The reaction to this force provides the driving thrust on the wheel.
The driving force on wheel Power Output of the blade : Diagram Efficiency or Blade efficiency:

11 Power Output of the blade :
Vr1 Va1 Vr2 Va2 b1 a1 a2 b2 For impulse blading with inviscid flow For blading with frictional flow

12 U Vr1 Va1 Vr2 Va2 b1 a1 a2 b2

13 For a given shape of the blade, the efficiency is a strong function of U/Va1, called blade speed ratio, f

14 Condition for maximum efficiency:
Vr1 Va1 Vr2 Va2 b1 a1 a2 b2

15 Availability of Steam for Condenser Temperature of 450C
Turbine Inlet : 3500 kJ/kg Turbine Exit Specific Available Jet Velocity Pressure Temp Enthalpy Work MPa C kJ/kg m/s 1 509.9 2464 1036 1439 2 5 528.4 2232 1268 1592 3 10 549.6 2135 1365 1652 4 15 569 2080 1420 1685 20 586.7 2041 1459 1708 6 25 602.9 2012 1488 1725 7 30 617.7 1989 1511 1738 8 35 631.3 1969 1531 1750

16 de Laval Turbine : The First Design for Steam Turbine
de Laval turbine is an impulse turbine : An enormous velocity (30,000 revolutions per minute in the 5 H. P. size) is requisite for high efficiency, and the machine has therefore to be geared down to be of practical use.

17 Creation of Wonderful Concept with Deep Fluid Dynamics & it is Still Valid?!?!?!
The creator had a long term vision in Developing a Sustainable & Economically Viable Non-biological Beast……

18 An Invention that Made abundance of Electricity at Very Cheap
The modern steam turbine was invented in 1884 by the Englishman Sir Charles Parsons. The first model was connected to a dynamo that generated 7.5 kW (10 hp) of electricity. The invention of Parson's steam turbine made cheap and plentiful electricity possible and revolutionized marine transport and naval warfare. His patent was licensed and the turbine scaled-up shortly after by an American, George Westinghouse. The Parson's turbine also turned out to be easy to scale up.

19 A Device Easy to Scale up
Parsons had the satisfaction of seeing his invention adopted for all major world power stations, and the size of generators had increased from his first 7.5 kW set up to units of 50,000 kW capacity. Within Parson's lifetime the generating capacity of a unit was scaled up by about 10,000 times. The total output from turbo-generators constructed by his firm C. A. Parsons and Company and by their licensees, for land purposes alone, had exceeded thirty million horse-power.

20 Classification of Steam Turbines

21 The most powerful steam turbine-generator in the world at the time of it's construction:1903
Built in 1903, the 5,000-kilowatt Curtis steam turbine-generator was the most powerful in the world. It stood just 25 feet high, much shorter than the 60 feet reciprocating engine-generator of a similar capacity

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