The relationship between the fluctuating drag and lift pressures in the turbulent area within a flowduct is given.
在管道通风系统中的湍流区内，震荡波动的阻力气压与推力气压之间的关系已被阐述。
2
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。
3
Through hydrodynamic similitude experiments, coefficients hindering flow of the gel in duct is calculated.