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本文介绍在暂冲式三声速风洞中实现了非定常流动的多片光蒸汽屏显示技术和测力技术，并用这两项技术研究了亚声速时７０°后掠三角翼模型俯仰振动的非定常流动现象，探讨了由于三角翼模型俯仰振动产生的涡结构与纵向气动力特性之间的相关关系
In this paper, we introduce the multi-sheet vapor-vapor display technology and force measurement technology in the transient-type three-speed wind tunnel, and use the two techniques to study the non-steady-state sounding of the 70 ° sweepback delta wing model The phenomenon of steady flow and the relationship between the vortical structure and the longitudinal aerodynamic characteristics due to the pitch vibration of the delta wing model