Why Does the Airflow of Tunnel Fans Decrease During Operation?

Tunnel fans are fans used in tunnels, as they are commonly employed in tunnels located at places such as hydroelectric dams, railways, subways, highways, and more. Therefore, the airflow they deliver must be uniform. However, it has been reported by many that the fans they use experience a significant drop in airflow after reaching a certain point during material transportation. Why is that? What causes the airflow of tunnel fans to decrease during use?

The tunnel fan is currently in the delivery process, passing through the wind tube and ducts, where the uneven tightness of the wind tubes and ducts poses a significant barrier to the vortex. Factors such as gas volume and density also contribute to the size of the barriers encountered as the wind progresses.

Why would the air volume of tunnel fans decrease during operation? It could be due to irregular placement within the tunnel, or damage to the air duct, such as leaks or breaks.

③ The tunnel fan, a normal adoption of the centrifugal axial flow fan, utilizes a dual-generator type. This results in a significantly higher pressure response compared to a single-generator model. Once the fan is activated, the stability of the external voltage provides the generator with satisfactory speed, allowing for adjustments in the fan's response to increase or decrease.