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CYCLE DESIGN PARAMETRIC STUDY GasTurb 12 – Tutorial 2 Copyright © GasTurb GmbH.

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Presentation on theme: "CYCLE DESIGN PARAMETRIC STUDY GasTurb 12 – Tutorial 2 Copyright © GasTurb GmbH."— Presentation transcript:

1 CYCLE DESIGN PARAMETRIC STUDY GasTurb 12 – Tutorial 2 Copyright © GasTurb GmbH

2 GasTurb 12 Main Window For this tutorial we will consider a 2 Spool Turbofan. Copyright © GasTurb GmbH

3 We Need Some Data Copyright © GasTurb GmbH

4 Input Data Page First we run a single cycle Copyright © GasTurb GmbH

5 Single Cycle Output 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. Copyright © GasTurb GmbH

6 Turbofan Station Designation These are the locations of the thermodynamic stations and the secondary air system paths Copyright © GasTurb GmbH

7 Parametric Study Now we go for a Parametric study. Copyright © GasTurb GmbH

8 Parameter Selection 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. 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 © GasTurb GmbH

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) 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 © GasTurb GmbH

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

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

12 Plot With Four Y-Axes 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 © GasTurb GmbH

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

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 Next have a look at all the data from a specific parameter combination. Click Detailed Output Copyright © GasTurb GmbH

15 Getting the Detailed Output for any Parameter Combination SELECT Double click (in GasTurb) to select T4=1425 and HPC Pressure Ratio = 9 Double click (in GasTurb) to select T4=1425 and HPC Pressure Ratio = 9 Now we will add more information to the picture. Click New Picture Now we will add more information to the picture. Click New Picture Copyright © GasTurb GmbH

16 Contour Parameter Selection An option: Click to sort the property names alphabetically Copyright © GasTurb GmbH

17 Plot with Contours Copyright © GasTurb GmbH

18 Editing Contours Edit the numbers: Lowest Contour Value = Step Size = Edit the numbers: Lowest Contour Value = Step Size = Click to apply the new settings Copyright © GasTurb GmbH

19 The Customized Plot Let us add now a design limit for T45 of 1200 K to the carpet. Let us add now a design limit for T45 of 1200 K to the carpet. Copyright © GasTurb GmbH

20 Showing Design Limits Example: Add a Boundary for T45>1200K Upper or lower limit Copyright © GasTurb GmbH

21 Showing Design Limits Next we go for another New Picture Next we go for another New Picture Copyright © GasTurb GmbH

22 Specific Fuel Consumption (SFC) as a Function of HPT Pressure Ratio Sometimes the lines are overlapping and the plot is difficult to read Changing the Layout resolves this problem 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. 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 We go for another New Picture Copyright © GasTurb GmbH

23 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. 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. Closing this window brings us back to the cycle design input window Copyright © GasTurb GmbH

24 Go for Iterations Copyright © GasTurb GmbH

25 Define the Iteration How to define an iteration is shown in the Single Cycle Tutorial How to define an iteration is shown in the Single Cycle Tutorial Copyright © GasTurb GmbH

26 Re-Run the Parametric Study Copyright © GasTurb GmbH

27 No Change in this Window Copyright © GasTurb GmbH

28 Outer Fan Pressure Ratio is Optimized Copyright © GasTurb GmbH

29 GasTurb Copy to Clipboard, Pasted into Power Point and Re-Sized Copyright © GasTurb GmbH

30 De-Activating the Iteration Click to de-activate the iteration Now run the Parametric study again Copyright © GasTurb GmbH

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. Copyright © GasTurb GmbH

32 Outer Fan Pressure Ratio = 1.8 Repeat clicking this button until no parameter values are shown Copyright © GasTurb GmbH

33 Outer Fan Pressure Ratio = 1.8 Select a color Copyright © GasTurb GmbH

34 The Overlay on the Clipboard Copyright © GasTurb GmbH

35 Pasted on the Other Picture This slide ends the Cycle Design Parametric Tutorial This slide ends the Cycle Design Parametric Tutorial Copyright © GasTurb GmbH


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