Controlling Buffet through Local Mechanical Action and Heat Addition near a Lambda-Shaped Shock

摘要

Unsteady transonic flow past a two-dimensional airfoil with heat and momentum addition is numerically investigated. The flow analysis is based on the solution of the unsteady Reynolds equations closed by the k-ω SST turbulence model. The equations are integrated using the finite volume method. Several positions and shapes of the heat and momentum addition zones are considered for the purpose of determining an optimal means for controlling buffet. It is established that the most considerable variations in the buffet parameters are achieved when heat addition and mechanical action are realized on the upper wing surface. The thermal energy supply always increases the buffet frequency, while the mechanical action can both increase and reduce it.