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PRELIMINARY ENGINE DESIGN

GasTurb 12

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GasTurb 12 Main Window

For this tutorial we will use a Turbojet

and the scopeMore…

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We Need Some Data

Select the engine model

Open the engine model

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Input Data Page

There are two more buttons

with this scope

Click onEdit Geometry

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General Arrangement

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Inlet Design Options (1)

Strut/Chord Height = 0.5

Strut/Chord Height = 1

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Inlet Design Options (2)

Strut/Chord Height = 0.5Cone Angle = 10°

Strut/Chord Height = 0.5Cone Angle = 30°

Number of Struts=0Cone Angle = 25°Cone Length/Radius = 0.1

Number of Struts=0Cone Angle = 35°Cone Length/Radius = 1.3

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Compressor Design Options

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Compressor Flow Annulus ShapeIn

let

Rad

ius

Rat

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Annulus Shape Descriptor = 1

Annulus Shape Descriptor = 0.5

Annulus Shape Descriptor = 0

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Compressor Length

Aspect Ratio = 1.5 Aspect Ratio = 2

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Interactive DesignSee how an input quantity affects the design

Click onSlider Control

Select a quantity

Choose quantity from the list

Adjust min and max value and

click OK

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Burner

The diffusor area ratio is an input on the HP compressor input page

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Burner Shape

Can Width/Length = 0.4Length/Inlet Radius = 1Exit/Inlet Radius = 1.1

Can Width/Length = 0.6

Length/Inlet Radius = 1.5Exit/Inlet Radius = 1.3

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Turbine Design

Shrouded Un-Shrouded

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Turbine Flow Annulus

Aspect Ratio (Span/Chord) = 1.2Inner Radius: R,exit/R,inlet = 0.97Inner Annulus Slope @ Inlet = 0°Inner Annulus Slope @ Exit = -10°

Inner Radius: R,exit/R,inlet = 0.9

Aspect Ratio = 1.5

Inner Annulus Slope @ Inlet = 10°

+10°

Inner Annulus Slope @ Exit= 10°

+10°

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Turbine Exhaust Chasing

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Turbine Exhaust Flow Annulus

Cone Angle = 19°Casing Length/Inlet Radius = 1Cone Length/Inlet Radius = 0.5

Cone Length/Inlet Radius = 1

Cone Angle = 30°

Cone Length/Inlet Radius = 0.95

Cone Length = 0

Cone ends in the exhaust duct

Cone continues in nozzle

A6

Casing outer exit radius moves because A6 is retained

A6

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Standard Convergent Nozzles

Turbine Exhaust Cone ends in nozzle

Turbine Exhaust Cone continues in nozzle

Petal angle is input on the Nozzle Calculation page (cycle design)

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Plug Nozzle

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Power Generation Exhaust

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Interduct

The inner contour of the flow annulus is described with a 3rd order polynominal with given slopes at the inlet and the exit of the duct.

The outer contour follows from a linear area change from the inlet to the exit of the duct.

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Bypass

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Bypass ShapeFlat Point Radius/Inlet Radius = 1,27

Flat Point Radius/Inlet Radius = 1,37

Flat Point Radius/Inlet Radius = 1,27Flat Point Position = 40% of Length

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Bypass with Struts

• Nozzle position is measured relative to inner bypass length

(Station 13 → Station 5)

• Strut position is measured relative to outer bypass length(Station 13 → Station 16)

Outer Bypass Length

Inner Bypass Length

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Disk Nomenclature

Web diskHyperbolic

disk

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Disk Design Data

Free disk input

Result

Calculated disk input

Input for minimum disk bore radius - applied to all disks

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Disk Design DataEqual to the temperature

difference from the platform to the center point of the disk.

Disk shape optimization options

Disk design criteria

Blades are modeled as plates

Material selection

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Blade Attachment

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Stress Adaptation OptionsOptimization Off

Adapt Bore Width = 0bore width is as given by input

Adapt Bore Width = 1bore width is adapted

to the target design stress margin

Adapt Bore Radius = 0 Adapt Bore Radius = 1 Adapt Bore Radius = 0 Adapt Bore Radius = 1

bore radius is as given by input

bore radius is adapted to the target design

stress margin

bore radius is as given by input

bore radius is set to its lower limit

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Stress Adaptation OptionsOptimization On

Adapt Bore Width = 0bore width is as given by input

Adapt Bore Width = 1bore width is an optimization variable

Adapt Bore Radius = 0 Adapt Bore Radius = 1 Adapt Bore Radius = 0 Adapt Bore Radius = 1

bore radius is as given by input

bore radius is an optimization variable

bore radius is as given by input

bore radius is an optimization variable

Figure of Merit = WeightConstraint = All Design Margins >= 0

  lower limit upper limit

Outer Rim Height/Rim Width 0.1 1

Web Width/Rim Width 0.15 1

Inner Rim Height/Rim Width 0.2 1

Optimization Variables

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Disk Calculation Options

Here you can control optimization of each disk

individually.

Overstressed disks are displayed yellow.

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Disk Stress DetailsAn Option in GasTurb Details 6

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Material Data Bank Editor A Feature of GasTurb Details 6