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CYCLE DESIGN PARAMETRIC STUDY GasTurb 12 – Tutorial 2 Copyright © Joachim Kurzke

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

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We Need Some Data Copyright © Joachim Kurzke

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Input Data Page Copyright © Joachim Kurzke First we run a single cycle

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Single Cycle Output Copyright © Joachim Kurzke This is a cycle for a business jet engine. Cruise flight condition is 11000m @ 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.

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Turbofan Station Designation Copyright © Joachim Kurzke These are the locations of the thermodynamic stations and the secondary air system paths

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Parametric Study Copyright © Joachim Kurzke Now we go for a Parametric study.

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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. 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.

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Graphical Output Picture Definition Copyright © Joachim Kurzke 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)

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Single Parameter Plot With a Single Y-Axis Copyright © Joachim Kurzke 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

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Single Parameter A Plot With Several Y-Axes Copyright © Joachim Kurzke 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!

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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.

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Parameter Selection Adding a Second Parameter Copyright © Joachim Kurzke 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

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The Default Plot No Contour Lines Copyright © Joachim Kurzke 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

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Getting the Detailed Output for any Parameter Combination Copyright © Joachim Kurzke 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

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Contour Parameter Selection Copyright © Joachim Kurzke An option: Click to sort the property names alphabetically

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Plot with Contours Copyright © Joachim Kurzke

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Editing Contours Copyright © Joachim Kurzke Edit the numbers: Lowest Contour Value = 0.435 Step Size = 0.005 Edit the numbers: Lowest Contour Value = 0.435 Step Size = 0.005 Click to apply the new settings

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The Customized Plot Copyright © Joachim Kurzke 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.

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Showing Design Limits Example: Add a Boundary for T45>1200K Copyright © Joachim Kurzke Upper or lower limit

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Showing Design Limits Copyright © Joachim Kurzke Next we go for another New Picture Next we go for another New Picture

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Specific Fuel Consumption (SFC) as a Function of HPT Pressure Ratio Copyright © Joachim Kurzke 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

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Specific Fuel Consumption (SFC) as a Function of Ideal Jet Velocity Ratio V18/V8 Copyright © Joachim Kurzke 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

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Go for Iterations Copyright © Joachim Kurzke

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Define the Iteration Copyright © Joachim Kurzke How to define an iteration is shown in the Single Cycle Tutorial How to define an iteration is shown in the Single Cycle Tutorial

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Re-Run the Parametric Study Copyright © Joachim Kurzke

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No Change in this Window Copyright © Joachim Kurzke

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Outer Fan Pressure Ratio is Optimized Copyright © Joachim Kurzke

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GasTurb Copy to Clipboard, Pasted into Power Point and Re-Sized Copyright © Joachim Kurzke

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De-Activating the Iteration Copyright © Joachim Kurzke Click to de-activate the iteration Now run the Parametric study again

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Outer Fan Pressure Ratio = 1.8 Iteration is De-Activated Copyright © Joachim Kurzke Adjust the scales to make the picture comparable to the picture with the optimized Outer Fan Pressure Ratio.

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Outer Fan Pressure Ratio = 1.8 Copyright © Joachim Kurzke Repeat clicking this button until no parameter values are shown

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Outer Fan Pressure Ratio = 1.8 Copyright © Joachim Kurzke Select a color

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The Overlay on the Clipboard Copyright © Joachim Kurzke

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Pasted on the Other Picture Copyright © Joachim Kurzke This slide ends the Cycle Design Parametric Tutorial This slide ends the Cycle Design Parametric Tutorial

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