Abstract: To research aerodynamic characteristics of hypersonic vehicle with air-breathing inlet, a new measurement method of internal drag was proposed. Through the combination of DPIV and total pressure rake which were applied to measure velocity field and pitot pressure field of outlet flow,respectively,from scramjet nozzle, mean Mach number and mean static pressure can be computed indirectly, and internal drag measurement of hypersonic flow through model was achieved. The research results show that the new measurement method successfully measure internal drag of hypersonic flow through model. The particle images of DPIV can clearly display the interface between internal and external flow and the wakes of boundary layer. DPIV can supply accurate velocity fields which possess more information than measurement results of traditional test technique. 

Key words: Flight Vehicle; Flow through model; Hypersonic; Internal drag measurement

摘要： 为了研究吸气式高超声速飞行器的气动特性,提出一种新的内流阻力测量技术,即采用粒子图像测速技术和总压测量技术相结合,测量超燃发动机尾喷管流场速度矢量和皮托压力分布,间接获得内流出口处平均马赫数和内流出口处静压平均值,从而实现高超声速通气模型内流阻力测量。研究结果表明:粒子图像测速技术和总压测量技术相结合,成功地实现了内流阻力测量；试验获得的粒子图像,能够清楚地显示喷管出口位置内外流的分界面及边界层和边界层的尾迹；粒子图像测速试验获得的速度矢量场结果准确,精度高,能够提供远远超出传统测量技术所能提供的流场信息。 

关键词: 飞行器;通气模型;高超声速;内阻测量 