Follow me below to master the influencing factors and selection of the thrust of the jet fan, and I look forward to your assistance.
1.Vertical distance in the middle of a group of fans
If there is a sufficient distance between a group of fans in the tunnel, the gushing cyclone will slow down sufficiently. If the gushing cyclone is not completely slowed down, it will affect the working characteristics of the next level of fans. In general, the longitudinal interval in the middle of a group of fans is named 10 times or about 10 times the equivalent diameter of the hydroelectric power generation in the cross section of the tunnel. One tenth of the gas dynamic pressure (Pa) of the fan can also be used as the longitudinal interval (m ), The distance between the management center in the middle of the same group of fans is at least twice the diameter of the fan. The layout of the jet fans in the tunnel does not necessarily have the same interval. If there is sufficient longitudinal space in the middle of the fans, the fans can be located as close to the tunnel edge as possible. If the radial installation of the fan allows some skew, the fan The longitudinal distance in the middle can be reduced, which can increase the installation index.
Influencing factors and selection of jet fan thrust
2.Air velocity in the tunnel, the closeness of the environmental protection fan to the boundary layer and the vault
Fan thrust is measured on the basis of the change of the angular momentum of the fan under the gas stationary standard. If the gas at the fan inlet is in a state of fitness and exercise, the transition value of the angular momentum of the gas in the fan must be reduced. If the installation site of the jet fan is close to the tunnel boundary layer or the vault, the gas water jet and the boundary layer or between the vault must cause additional friction damage.
The ratio of the power consumption and thrust of the jet fan is related to the wind power at the outlet of the wind turbine. According to the given thrust regulations, the higher the wind power at the outlet, the greater the power consumption. Therefore, in order to reduce operating costs, fans with large diameters, low speed ratios, or small leaf angles should be selected as much as possible. According to the given wind turbine specifications, if the thrust is reduced, the total number of wind turbines will be increased, and the project investment of the wind turbines will be increased, but at this time, the wind power at the wind turbine outlet will also decrease, which will prompt the muffler to cancel or reduce its length.
4. Reversible operation fan
Comparing reversible fans with unilateral fans, the efficiency is slightly lower, and the noise is slightly higher, but this type of fans can make tunnels have a lot of selectivity. When it is very necessary, a unilateral tunnel can be operated as a dual operation. In the event of a fire, the fan can reverse the smoke exhaust system.