duct velocity profile 管内流速分布图 ; 管内速度分布图
high-velocity duct 高速管道
low velocity duct 低速通风管
high-velocity duct system 高速风道系统
velocity method duct sizing 速度法
velocity reduction method duct sizing 速度递减法风道计算
The SPRD is used on zone systems when the automatic closing of various zone dampers can create an excessive increase in air pressure and velocity throughout the duct system.
SPRD旁通阀是当各种区域风门自动关闭时用在区域系统中，可以在管道系统中增加空气压力盒速度。
Finally, we give as an example the calculation of complex velocity potential for a twisted duct with square cross-section.
最后给出了一个方形扭曲管的复速度势计算实例。
The SPRD will automatically open as the air pressure in the duct system increases, in order to prevent the reduction of air flow and excessive noise and velocity through the duct system.
当管道系统空气压力增加时，SPRD会自动开启，以防止管道系统中空气流动的减少和过度噪音和速度。
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