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1·Finally, in view of vortex sheet, the formula of virtual mass has been re-derived.

最后，本文从涡层的角度重新推导了翼型虚拟质量计算公式。

2·A modified trailing vortex wake model of propeller is introduced to describe the distortion and separation of the trailing vortex sheet.

采用了一个修正的螺旋桨尾涡模型，来模拟导管螺旋桨尾涡片的扭曲变形及分离现象。

3·Wenling city DingSheng vacuum apparatus Co. , lLtd. lies in Wenling city south of the town , it is an enterprise which specializes in producing the vortex sheet type vacuum pump and vacuum apparatus.

温岭市鼎盛真空设备有限公司位于温岭市城南镇，是一家专业生产旋片式真空泵及真空设备的企业。

4·A vortex member is arranged on the vortex net board. The vortex member is a spiral twist sheet with a spiral Angle. The axial shape of the spiral twist sheet is circular.

所述旋流构件为一段带螺旋角的螺旋扭片，所述螺旋扭片的轴向形状为圆形。