Flow and wind pressure of cross flow fanIssuing time:2020-07-08 08:27
Two important parameters of the aerodynamic performance of cross-flow fans are: flow rate and wind pressure flow Also called air volume, it is usually measured by the volume of gas flowing through the fan per unit time. The numerical value needs to be obtained through the aerodynamic performance test. Common units of engineering are cubic meters per minute (CMM) and cubic feet per minute (CFM), 1CMM=35.35CFM.
pressure Also known as wind pressure, it refers to the pressure increase value of the gas in the fan, or the difference between the gas pressure at the inlet and outlet of the fan. Its common unit is Pascal (Pa), which has static pressure, dynamic pressure and total pressure. Minute: Static pressure Ps: The pressure at which the ventilator overcomes the resistance of the ventilation, which is the pressure of the gas acting on the surface of the object parallel to the airflow, which is measured through the hole perpendicular to its surface. Dynamic pressure Pd: Dynamic pressure refers to the amount of kinetic energy per unit volume of fluid. Total pressure: the algebraic sum of dynamic pressure and static pressure Generally, the fan only uses the fan static pressure characteristic curve (Ps-Q), which is a series of measured wind pressure Ps and air volume Q value by changing the wind resistance of the fan multiple times. |
