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为了诊断瞬态高速喷流的结构特征,开展了基于分子滤波瑞利散射(FRS)技术的可视化研究.介绍了FRS技术的基本原理,分析了散射光的多普勒频移对诊断的影响.针对瞬态高速喷流特点,建立了FRS诊断系统,设计了两种不同的激光入射方式.采用与流场方向垂直的激光入射方式,获得了喷流与空气作用的湍流结构.而采用与流场轴向平行的激光入射方式,则获得了喷流自身的结构.FRS技术对瞬态高速喷流的可视化研究,对研究超声速湍流混合层流场具有重要指导意义.
In order to diagnose the structural characteristics of transient high-speed jet, a visualization research based on molecular filtering Rayleigh scattering (FRS) is carried out.The basic principle of FRS is introduced and the influence of Doppler shift of scattered light on the diagnosis is analyzed. Aiming at the characteristics of transient high-speed jet, an FRS diagnostic system was established and two different laser incidence modes were designed. The turbulent structure of jet and air was obtained by using the laser incident mode perpendicular to the flow field. The field-parallel axial laser incident mode obtains the jet’s own structure.The visualization of transient high-speed jet by FRS technology is of great guiding significance for studying the supersonic turbulent mixed-layer flow field.