INVESTIGATION OF A QUASI-3D METHOD FOR OPTIMIZING AERODYNAMIC PERFORMANCE OF GAS TURBINE AIRFOILS
Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Over the past few decades the performance of gas turbine airfoils has been improved continually by creating advanced aerodynamic and thermal designs.
Today often-times optimisation methods are used to handle the increased complexity of such a design, where possible efficiency performance increase is in the order of a fraction of a percentage point. However, optimisation is expensive when performed based on 3D CFD calculations. Therefore, an optimisation strategy based on simpler, less expensive analysis methods is desirable.
In this thesis a quasi-3D optimization approach to reduce blade profile losses is investigated. The presented quasi-3D setup uses several blade sections that are evaluated with a computationally inexpensive 2D CFD code. The results obtained with the code are then combined to get the overall blade performance, neglecting 3D flow features than are not captured by the 2D calculations. 3D blade design features, such as bow, lean or sweep, are not investigated.
In the work presented, three test case s are set up and investigated: a second stage stator vane, a fourth stage stator vane and a third stage rotor blade. First, results obtained with the quasi-3D method are compared to results obtained by full 3D CFD calculations in a correlation study.
Next, quasi-3D optimization is performed for the three test cases and the results of the optimization are evaluated by means of a full 3D CFD calculation and compared to the quasi-3D predictions.
The results indicate that the method is suitable for optimization and application concepts are presented.
Place, publisher, year, edition, pages
IdentifiersURN: urn:nbn:se:kth:diva-104296OAI: oai:DiVA.org:kth-104296DiVA: diva2:563728
Master of Science - Turbomachinery Aeromechanic University Training
2012-09-05, M263, Brinellvägen 68, 100 44 Stockholm, 13:00 (English)
Vogt, Damian, Dr
Vogt, Damian, Dr