1. Cycle Design Parametric Study
GasTurb 12 – Tutorial 2
Cycle Design Parametric Study
Copyright © Joachim Kurzke

2. For this tutorial we will consider a 2 Spool Turbofan.
GasTurb 12 Main Window
For this tutorial we will consider a 2 Spool Turbofan.
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3. We Need Some Data
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4. First we run a single cycle
Input Data Page
First we run a single cycle
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5. Single Cycle Output Copyright © Joachim Kurzke
This is a cycle for a business jet engine. Cruise flight condition is Mach 0.8. The overall pressure ratio is rather low (P3/P2=17.33), burner exit temperature is 1450K and the bypass ratio is 6.

6. Turbofan Station Designation
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These are the locations of the thermodynamic stations and the secondary air system paths

7. Now we go for a Parametric study.
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Now we go for a Parametric study.

8. Parameter Selection Copyright © Joachim Kurzke
Click here to run all cases
This is the HP Compressor Pressure Ratio of the Single Cycle calculated before this parametric study.
Choose a property from the list, double click or drag it to the parameter page on the right. You can also click the arrow for moving a parameter from left to right.
We employ
HP Compressor Pressure Ratio
as the only parameter for now.
Copyright © Joachim Kurzke

9. Graphical Output Picture Definition
The result of a parametric study is presented graphically.
Sp. Fuel Consumption and Net Thrust
are the default plot parameters.
To employ Overall Pressure Ratio P3/P2
as x-axis, drag it to the box below the schematic picture. Then click Draw y=f(x)
Copyright © Joachim Kurzke

10. Single Parameter Plot With a Single Y-Axis
This black square marks the Cycle calculated before beginning the Parametric study
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We go back to the previous window and select a new view (New Picture) of the data created in the Parametric Study

11. Single Parameter A Plot With Several Y-Axes
Select the number of y-axes first!
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We will employ several y-axes
Drag four parameters to the respective y-axis boxes. Then click Draw y=f(x)

12. Plot With Four Y-Axes Copyright © Joachim Kurzke
On each y-axis there is a different symbol.
This line belongs to the LPT Pressure Ratio axis – the symbols on the line and on the axis are the same.
Close this window to go for a new Parametric study.
Copyright © Joachim Kurzke

13. Parameter Selection Adding a Second Parameter
Click this tab for specifying the second parameter
Use these numbers
Click here to run all cases
This is the Burner Exit Temperature of the cycle calculated before this Parametric study.
Copyright © Joachim Kurzke
We employ Burner Exit Temperature as the second parameter

14. The Default Plot No Contour Lines
This little black square marks the cycle calculated before beginning the Parametric study
Next have a look at all the data from a specific parameter combination.
Click
Detailed Output
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15. Getting the Detailed Output for any Parameter Combination
Now we will add more information to the picture. Click
New Picture
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SELECT
Double click (in GasTurb) to select T4=1425 and
HPC Pressure Ratio = 9

16. Contour Parameter Selection
An option: Click to sort the property names alphabetically
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17. Plot with Contours
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18. Click to apply the new settings
Editing Contours
Edit the numbers:
Lowest Contour Value = 0.435
Step Size = 0.005
Click to apply the new settings
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19. Let us add now a design limit for T45 of 1200 K
The Customized Plot
Let us add now a design limit for T45 of 1200 K
to the carpet.
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20. Showing Design Limits Example: Add a Boundary for T45>1200K
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Upper or lower limit

21. Showing Design Limits Copyright © Joachim Kurzke
Next we go for another
New Picture
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22. Specific Fuel Consumption (SFC) as a Function of HPT Pressure Ratio
The disadvantage of this plot is that there is no information about
HPT Pressure Ratio anymore.
To correct for that we add contour lines for HPT Pressure Ratio.
We go for another
New Picture
Sometimes the lines are overlapping and the plot is difficult to read
Changing the Layout resolves this problem
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23. Closing this window brings us back to the cycle design input window
Specific Fuel Consumption (SFC) as a Function of Ideal Jet Velocity Ratio V18/V8
For each HP Compressor Pressure Ratio the best SFC is achieved if the Ideal Jet Velocity Ratio V18/V8 is approximately 0.8. This relation between the bypass nozzle velocity V18 and the core nozzle velocity V8 can be achieved by choosing the right Outer Fan Pressure Ratio.
In the next parametric study we will iterate Outer Fan Pressure Ratio in such a way that the Ideal Jet Velocity Ratio V18/V8 is equal to 0.8. Thus all the cycles are optimized for Specific Fuel Consumption SFC .
Copyright © Joachim Kurzke
Closing this window brings us back to the cycle design input window

24. Go for Iterations
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25. How to define an iteration is shown in the
Define the Iteration
How to define an iteration is shown in the
Single Cycle Tutorial
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26. Re-Run the Parametric Study
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27. No Change in this Window
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28. Outer Fan Pressure Ratio is Optimized
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29. GasTurb Copy to Clipboard, Pasted into Power Point and Re-Sized
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30. De-Activating the Iteration
Click to de-activate the iteration
Now run the Parametric study again
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31. Outer Fan Pressure Ratio = 1.8 Iteration is De-Activated
Adjust the scales to make the picture comparable to the picture with the optimized Outer Fan Pressure Ratio.
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32. Outer Fan Pressure Ratio = 1.8
Repeat clicking this button until no parameter values are shown
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33. Outer Fan Pressure Ratio = 1.8
Select a color
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34. The Overlay on the Clipboard
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35. Pasted on the Other Picture
This slide ends the
Cycle Design Parametric Tutorial
Copyright © Joachim Kurzke