Opposing jets for heat flux reduction and uncertainty analysis on a V-shaped blunt leading edge

Abstract

With the development of three-dimensional inward-turning inlets, the V-shaped blunt leading edge model has attracted increasing attention. In the current study, an approach of using opposing jets for heat flux reduction on the V-shaped blunt leading edge is put forward. The flow structures of the V-shaped model and the model with opposing jets are further analyzed. The mechanism of heat flux generation and heat flux reduction are pointed out. By utilizing the point-collocation non-intrusive polynomial chaos (NIPC) method, the uncertainty quantification and sensitivity analysis are carried out for the parameters of the freestream and opposing jet. When calculating the uncertainty intervals, it is recommended to use the Monto Carlo method to generate massive samples for the surrogate model instead of directly using the general confidence interval. Results show that the uncertainty for heat flux is much more severe than pressure. The most contributions of the input parameters come from the freestream Mach number Ma∞ and the freestream temperature Tinf. The heat flux reduction approach proposed in this work proves to be effective for heat flux reduction and has potential application for engineering practices.