Cross-flow Instability Analysis and Transition Prediction of Swept Wing

The stability and transition of swept wing boundary layers have important reference value to the design and optimization of airfoil. The cross-flow instability is one of the key parameters for boundary layer transition. Based on the NLF(2)-0415 airfoil profile, the mean flow of the swept-wing boundary layer was calculated by numerically solving the three-dimensional compressible Navier-Stocks equation with γ-Re_θt transition model. Considering the original transition model could only predict the transition along streamwise, cross-flow intermittency factor was established to the original transition model to conduct the numerical simulation of cross-flow instabilities transition for complex configuration. The numerical results show that the improved transition model could predict the location of cross-flow instability transition of swept wing which is in good agreement with the test data. Therefore, improved transition model is reasonable and practical.