一、引言 进气道的地面状态性能是进气道各种状态下的重要性能之一.大家知道,设计点取在高空高速状态下的进气道,当在地面状态工作时,进气道性能严重恶化.斯贝发动机对地面工作状态下规定的指标较高,它要求进气道的总压恢复系数σ达0.905,周向总压畸变指数DC_(60)为-0.25.为了使本进气道与斯贝发动机 I. INTRODUCTION The ground state performance of the air intake is one of the important performance under various conditions of the air intake.As we all know, the air intake at the high-altitude and high-speed design point is taken into account. When working in the ground state, The performance is seriously deteriorated.Spyer engine on the ground under the conditions of the work of a higher target, which requires the inlet pressure recovery coefficient sigma of 0.905, the circumferential total pressure distortion index DC_ (60) is -0.25 In order to make this Airway and Spey engine