Reasons for affecting the thrust of the tunnel fan
(1) Reversible rotation of the fan.
The inverter fan has lower frequency and higher noise than the one-way fan, but this fan can make the tunnel operation more selective.If there are special needs, the one-way channel can be used to make the two roads run, when the fire, the fan reversible smoke exhaust.
In the wind tunnel, if there is a residual distance between each turbine, the wind jet will gradually accelerate, and if the cyclone acceleration is insufficient, it reflects the working performance of the downwind.The arrangement of the falling fan in the air tunnel need not be equal.If there is a remaining longitudinal distance between the fans, the fan can be arranged near the tunnel inlet as far as possible; If the axial installation position of the fan is offset, the longitudinal distance between the fans can be reduced to make the installation coefficient regression.What is the thrust of the roadheader?
(3) Flow rate of the tunnel ventilator.
If the atmosphere at the fan exit is active, the change value of the air momentum in the fan will inevitably decrease.The thrust of the fan is determined according to the change of the fan atmospheric momentum in the moving atmosphere.If the falling fan is installed close to the tunnel wall or vault, the downward airflow and the external force between the arch wall or vault will disappear.
The ratio of reduced power and thrust is related to the fan air inlet wind speed.Meet the thrust requirements, the larger the air inlet, the greater the power consumption.When the size of the fan is certain, the thrust increases, which will inevitably increase the fan unit, thus increasing the investment of the fan itself.However, at this time, the fan inlet wind speed will also increase, so that the quencher can not be used, the length is reduced.In order to improve the operation interest, the fan with large diameter, low speed and small blade position should be selected as far as possible