Temperature, Mach Number, and Velocity Changes with Blade Height in Gas Turbines, Slides of Physics

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Presentation Lay Out

1

• Design data
• Pro E modeling
• Air foil construction
• Cascaded 3D modeling
• Meshing Independency
• CFD analysis for 8 blades with axial velocity

Presentation Lay Out

2

• CFD analysis of 6 blades with axial velocity
• Mesh Independency and Results
  • CFD analysis of 4 blades with axial velocity
  • Mesh Independency Results
• CFD analysis of 8 blades with relative velocity
• Results

 To study the effect of blade height variation on Velocity sum of gas turbine

 To study the effect of blade height variation on Mach number of gas turbine

 To study the effect of blade height variation on Temperature of gas turbine

 To study the effect of blade height variation on Pressure of gas turbine

4

Objective

5

Data Velocity diagram

Design Calculation

Inlet Temperature(To 1 ) 900K Atam Temperature(To 3 ) 288K Inlet Pressure(Po 1 ) 2bar Mass flow rate(mdot) 1kg/s Nozzle loss coefficient(λN) 0. Rotational speed(N) 6000rpm Flow coefficient(φ) 0. Swirl angle(α 3 ) 150 Blade velocity(U) 60m/s Isentropic stage efficiency(η) 0. Temperature drop(ΔT) 5K

 Draw two parallel lines such that their distance between them is equal to axial chord

 Take 3 points on lower line such that the distance between the 2 extreme points is equal to pitch of blade

19

Pro E Modeling

 Take “s” from extreme left point at distance of 0.1cm

 Draw an arc taking “s” is center point and radius equal to e=13.76cm

 Draw another arc taking “p” is centre and radius equal to e+o.

20

Pro E Modeling Cont..

 Draw a line from “o” such that line makes an angle of 34^0 with y-axis

 Then draw circles such that these circles are tangent to arcs drawn from point “s” and “p”

22

Pro E Modeling Cont..

 Locate points on all these intersection points

 Pass a spline through these points

23

Pro E Modeling Cont..

 ANSYS is opened and the following options are checked

 IGES import option is not defeaturing

 Merge coincident key points option is checked as Yes

25

Import IGES to ANSYS

 Create solid if applicable option is checked as Yes

 Delete small area option is checked as Yes

26

Import IGES to ANSYS Cont..

 NL refers to number of required line

 RATIO refers to 0- 1,default is 0.

 NK1 refers to number assigned to keypoint

28

Generation of keypoints Cont..

 GUI Method

 Main Menu>preprocessor>

Modeling>create

keypoints>on line OR w/ratio

 Listing the keypoints

 Utility menu>list>keypoints>co ordinates only 29

Keypoints Generation Cont..

 Copy command is used to generate eight airfoil

 AGEN,8,1, , ,.

 AGEN creates area

 5 refers to number of area generated

 1 refers to area to be copied

 0.0344 is blade pitch

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Area generation Cont..

 K,1000,-.03,-.

 k,1001,0.02,0.

 K,1002,-.03,0.

 K,1003,0.20,0.

 K,1006,0.24,0.

 K,1007,0.2,-.

32

Flow channel modeling