| Summary: | 碩士 === 國立成功大學 === 航空太空工程學系 === 106 === Nowadays, the numerical simulation is a mature technology due to the advancement of science and technology. Numerical analysis has also become the mainstream tool for designing gas turbines. However, how to choose an appropriate numerical method becomes a very important issue. In this thesis, the performance of three different turbulence models, namely SST, low-Re, and v2f models, in some 2D and 3D compressor-blade flows has been investigated. These compressor-blade flows are: 2D DCA and CD blades, and a 3D NASA stage 37. The results of DCA and CD blades indicate that v2f models can return more accurate prediction at both design and off-design conditions. In particular, many complicated flows, such as separation bubbles, transition and separation, can be captured. In 3D NASA stage 37, the prediction by the SST and v2f model is much better than low-Re model, and their results are very similar. However, without considering hub leakage flow, magnitudes of pressure and temperature are overestimated. Other comparisons like pressure ratio and adiabatic efficiency characteristic map, SST model can predict reasonably well, with maximum error being 5.8%.
|
|---|
