Discussion on the relationship between static pressure and dynamic pressure of axial flow fans in cooling towers
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Fan wind pressure is the force per unit area, with the unit being pascal = Newton/meter2. The wind pressure of a fan is divided into static pressure and dynamic pressure, and the sum of the two is the total pressure. Static pressure is used to overcome the resistance in the flow channel; only when the static pressure balances this resistance can the fluid flow. For example, the static pressure at the pipe outlet must be equal to the external atmospheric pressure for the gas to flow out; the static pressure does work to overcome resistance, thereby ensuring the flow of air. Dynamic pressure is the kinetic energy of a fluid with mass ρ; it is closely related to the flow velocity, and can be expressed as Pd=1/2(ρv2), with V=(2*Pd/ρ)1/2. Dynamic pressure is the basis for generating aerodynamic force; both drag and lift are related to it and are proportional to it. The above is an explanation from a theoretical perspective, but what is the actual situation inside the cooling tower? How can the balance point between dynamic pressure and static pressure be determined? What methods can be used to effectively increase static pressure and reduce dynamic pressure? What specific measures are there?
The fans in cooling towers often do not operate at their optimal operating points. Regarding your question about the actual operating conditions within cooling towers, these are quite complex; it is recommended that you visit the cooling tower technology forum at www.lqueta.cn, as it will be more helpful for you in resolving issues related to cooling towers.
To increase the static pressure and reduce the dynamic pressure, the key is to minimize resistance losses, which can be addressed by considering factors such as the internal structure, packing, and spray density