Velocity Diagram
Transcript of Velocity Diagram
-
7/27/2019 Velocity Diagram
1/33
-
7/27/2019 Velocity Diagram
2/33
-
7/27/2019 Velocity Diagram
3/33
Cascade view
-
7/27/2019 Velocity Diagram
4/33
-
7/27/2019 Velocity Diagram
5/33
Meridional view
-
7/27/2019 Velocity Diagram
6/33
-
7/27/2019 Velocity Diagram
7/33
Velocity Triangle for a turbine stage
-
7/27/2019 Velocity Diagram
8/33
Triangle at section 3
-
7/27/2019 Velocity Diagram
9/33
Equation of fluid motion
Conservation of mass
-
7/27/2019 Velocity Diagram
10/33
Conservation to momentum
-
7/27/2019 Velocity Diagram
11/33
-
7/27/2019 Velocity Diagram
12/33
Rothalpy in stators and rotors
Stators:
Rotors:
-
7/27/2019 Velocity Diagram
13/33
Relative stagnation enthalpy
Efficiency and Reaction
-
7/27/2019 Velocity Diagram
14/33
-
7/27/2019 Velocity Diagram
15/33
-
7/27/2019 Velocity Diagram
16/33
Coefficients for axial machines
Flow coefficient
Stage loading coefficients or work coefficients
Efficiency
Reaction
-
7/27/2019 Velocity Diagram
17/33
-
7/27/2019 Velocity Diagram
18/33
Reaction for repeating stage
-
7/27/2019 Velocity Diagram
19/33
Impulse and 50% Reaction
-
7/27/2019 Velocity Diagram
20/33
Impulse
R=0
50% Reaction
-
7/27/2019 Velocity Diagram
21/33
Loading and Efficiency Variation with reaction
Impulse
-
7/27/2019 Velocity Diagram
22/33
50% Reaction
-
7/27/2019 Velocity Diagram
23/33
Stage efficiency in impulse and reaction
Entropy generation
1.
Viscous friction in either boundary or free shear layers.2. Heat transfer across a finite temperature difference
3. Non-equilibrium processes such as occur in shock waves.
-
7/27/2019 Velocity Diagram
24/33
-
7/27/2019 Velocity Diagram
25/33
-
7/27/2019 Velocity Diagram
26/33
-
7/27/2019 Velocity Diagram
27/33
Number of stages in a turbine section
Available energy per stage depends on the stage
reaction, rotor mean diameter and rotor speed:
Impulse Stage:
-
7/27/2019 Velocity Diagram
28/33
50% Reaction:
-
7/27/2019 Velocity Diagram
29/33
-
7/27/2019 Velocity Diagram
30/33
Fluid Flow
-
7/27/2019 Velocity Diagram
31/33
-
7/27/2019 Velocity Diagram
32/33
Flow Function
-
7/27/2019 Velocity Diagram
33/33
Critical pressure ratio
= Superheated steam (0.546)
= Saturated Steam(0.577)
LP Turbine exit velocity :1300-1400 ft/sec(396-
426m/s)
HP Inlet 1000F(537C) 1800-3500PSI(125-241bar):
2100-2200 ft/sec(640-670 m/s)