In order to inquire into the inner velocity field of ducted propeller, the windows were set inside the duct of a ducted propeller, which allowed optical access for LDV measurements.

• 摘要为了探讨导管内流场，通过在导管壁上开窗口，使用LDV激光穿过窗口方案来测量导管螺旋桨的内流场。