Project in jet engine OGV aerodynamics - Vane design 2018-11-23 Company, Department, Name day month year
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. 2018-11-23, Slide 2 7161, Sofia Ore
Objective Introduce Outlet Guide Vane (OGV) Give introduction to vane design fundamentals 7161, Sofia Ore 2018-11-23, Slide 3 Company, Department, Name day month year
What is an OGV? The OGV is situated behind the LPT. It is a part of the rear structure. 2018-11-23, Slide 4 7161, Sofia Ore
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. 2018-11-23, Slide 5 7161, Sofia Ore
Design goal High engine thrust (low pressure loss) Larger swirl angle out of the LPT => Higher efficency in the LPT Lighter engine because one stage in the LPT can be taken away. => large flow turning in the OGV 2018-11-23, Slide 6 7161, Sofia Ore
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. 7161, Sofia Ore 2018-11-23, Slide 7
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 Hub Shroud 7161, Sofia Ore 2018-11-23, Slide 8
Designing an OGV today Geometry generator Mesh in Gambit CFD calculations in Fluent 2018-11-23, Slide 9 7161, Sofia Ore
Designing an OGV Check no separation at off-design Make a 3D model and check the criterias. 2018-11-23, Slide 10 7161, Sofia Ore
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 2018-11-23, Slide 11 7161, Sofia Ore
CFD-data Given data for CFD calculations: Inlet angle = 30 degrees (on design) Inlet velocity = 20 m/s Outlet pressure = 101330 Pa 2018-11-23, Slide 12 7161, Sofia Ore
The designed test-facility 2018-11-23, Slide 13 7161, Sofia Ore
The designed test-facility Test rigg Vane 7161, Sofia Ore 2018-11-23, Slide 14
Thank you and good luck! 2018-11-23, Slide 15 7161, Sofia Ore