高超声速飞行器的阻力分解与气动特性OA

Drag is one of the most critical aerodynamic parameters for the performance of hypersonic vehicles,and thus accurately predicting drag and clarifying the physical processes for its generation are the main topics in the design and optimization of the vehicles.Currently,the mainstream methods for drag decomposition and prediction can be divided into near-field and far-field methods.In this paper,both the two types of methods are used to validate and analyze the aerodynamic characteristics of a waverider,and different forms of drag generation sources are investigated.With the near-field method,the contributions of wall pressure and skin friction are quantified,and their variations with the flight altitude,speed,and angle of attack are discussed.With the far-field method,the effects of shock waves and viscous shear in the flow field are quantified from the perspective of the thermodynamic entropy increase process.The wave drag and viscous drag are then calculated,as well as their dependence on the flight conditions.In the end,the integral terms of the wave drag are localized and split to identify the location of the main drag sources.