一、引言 众所周知,钝头翼型的头部区域对均匀来流的扰动不再是小量,该处流动不符合小扰动假设。因此,由跨音速小扰动方程得出的解在头部区域失效。本文将流场分为外部解区,内外解区及头部附近的内内解区(见图1)。我们着重分析了内内解区的绕流,首次给出了适于该区域的速位渐近展开式,一级近似 I. INTRODUCTION As we all know, the bluff-headed airfoil’s head area is no longer perturbed to a uniform flow, where the flow does not fit the hypothesis of small disturbance. Therefore, the solution derived from the transonic small perturbation equation fails in the head region. In this paper, the flow field is divided into external solution area, inner and outer solution area and the inner solution area near the head (see Figure 1). We focus on the analysis of the flow around the Nei Nei Jie area, for the first time is given for the region asymptotic expansion rate asymptotic, an approximation