Project in jet engine OGV aerodynamics - Vane design

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Project in jet engine OGV aerodynamics- Vane
design
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About me

• Working at the department of aerothermodynamics
  at Volvo Aero in Trollhättan.
• Studied at Chalmers, Master of science in
  chemistry and physics spring 2006.
• Master thesis about optimisation of a outlet
  nozzle using response surface methodology at
  Volvo.

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Objective

• Introduce Outlet Guide Vane (OGV)
• Give introduction to vane design fundamentals

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What is an OGV?

• The OGV is situated behind the LPT.
• It is a part of the rear structure.

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Functions

• Turn the flow to axial.
• Load carrier since the rear engine mount is
  situated in the rear structure.
• Oil pipes through some vanes implies constraints
  on their thickness.

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Design goal

• High engine thrust (low pressure loss)
• Larger swirl angle out of the LPT gt
• Higher efficency in the LPT
• Lighter engine because one stage in the LPT can
  be taken away.
• gt large flow turning in the OGV

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Designing an OGV
1.

• Design cases
• On-design, Cruise
• Off-design, 10 degrees
• In off-design conditions separation may occur
  which leads to increased pressure losses.
• Most problematic area is the suction side,
  especially near the end-walls.

2.
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Designing an OGV

• Start by designing a 2D vane at the midspan using
  given criterias such as
• tmax (oil pipes)
• inlet boundary conditions (from the turbine)
• inlet velocity
• inlet angle
• inlet pressure
• pitch
• span

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Designing an OGV today
Geometry generator
Mesh in Gambit
CFD calculations in Fluent
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Designing an OGV

• Check no separation at off-design
• Make a 3D model and check the criterias.

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The design process

• CFD
• Mesh and calculate the nine OGV
• Optimisation
• Find the best OGV from the ones you get
• Experiment
• Design a 3D model of the OGV including pressure
  taps
• Manufacture
• Validation

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CFD-data

• Given data for CFD calculations
• Inlet angle 30 degrees (on design)
• Inlet velocity 20 m/s
• Outlet pressure 101330 Pa

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The designed test-facility
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The designed test-facility
Test rigg
Vane
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Thank you and good luck!