The total or total pressure is the sum of the dynamic and static pressures. Dynamic pressure refers to the kinetic energy obtained by the gas flowing through the blades. The static pressure of the China induced draft fan is different from the static pressure usually mentioned. The static pressure here is due to the pressure difference between the impeller and the fluid before the back of the blade. related to the speed of the blade. It is also related to the geometric dimensions of the blade inlet and outlet pipes, which can be understood as the change of pressure energy caused by the change of the section. Of course, the ratio of static pressure and dynamic pressure to the total pressure is also related to the type of blade.

It is often said that the static pressure of the fan should refer to the total pressure. But in practical considerations, static pressure is generally thought of. Because the pressure difference energy head obtained in this part is the most favorable, and try to avoid the conversion of velocity energy into pressure energy.

What is the difference between the static pressure and the dynamic pressure of the China centrifugal fan.

1. The static pressure of the gas is the pressure Pst on the surface of the object parallel to the direction of the gas.

2. The dynamic pressure of the gas converts the energy of the gas due to the flow velocity C (m/s) into the pressure rise without loss. Pd=ρ*C*C/2ρ---the density of the gas flow, kg /m^3

3. The total pressure P of the gas is the sum of the static pressure and the dynamic pressure of the gas at the same position. P=Pst+Pd

4. Fan full pressure P

The total pressure of the fan refers to the difference between the total pressure of the gas on the outlet and inlet sections of the fan. Charles law (Charles law) French scientist Charles (1746--1823) discovered through experiments. Charles' law states that for a certain mass of gas, when its volume is constant, its pressure is proportional to its thermodynamic temperature. That is, P1/P2=T1/T2 or pt=P'0 (1+t/273) where P'0 is the pressure of the gas at 0°C, and t is the temperature in Celsius. The pressure p and temperature of a gas are easily measured with manometers and thermometers. If the experimentally measured P-T graph is a straight line passing through the coordinate origin, or the P-t graph is a straight line and intersects with the t-axis at -273°C, the law is verified.