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Unsteady 3D CFD analysis of a 11=2-stage turbine with focus on heat transfer validation
KTH, School of Engineering Sciences (SCI), Mechanics.
2014 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The turbine mid-structure is a component located downstream of the high-pressure turbine in modern turbo-fan engines. It is exposed to high gas temperatures. It is therefore of intererst to predict heat transfer in this component. In this thesis unsteady and steady computational uid dynamics (CFD) simulations carried out with ANSYS CFX are used to predict heat transfer in the turbine mid-structure. Experimental data is used for validation of the results. In one of the unsteady simulations a 90 degree sector of the turbine is used. The other unsteady simulation uses a Transient Blade Row model and a smaller sector of the turbine. At 50% span the simulations underpredict the heat transfer on the pressure side and on the leading edge of the turbine mid-structure vane compared to measurements. On the suction side the agreement with measurements is better. The 90 degree sector simulation does not match the measurements much better than the results of the Time Transformation method and the steady simulation. Further unsteady simulations may advantageously be of the Time Transformation type due to its smaller computational cost.

Place, publisher, year, edition, pages
2014. , 46 p.
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-170783OAI: diva2:839877
Educational program
Master of Science - Engineering Mechanics
Available from: 2015-08-04 Created: 2015-07-06 Last updated: 2015-08-04Bibliographically approved

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