Jet fans play a crucial role in transverse ventilation systems for road tunnels. Transverse ventilation systems are designed to create a lateral airflow pattern across the tunnel's cross-section, perpendicular to the traffic flow direction. Jet fans are specially designed axial flow fans installed in the tunnel ceiling or walls at regular intervals to induce and control the lateral airflow. Let's delve into their function and design:
1. Function of Jet Fans in Transverse Ventilation:
* Airflow Induction: Jet fans induce lateral airflow across the tunnel by creating a high-velocity jet of air. This jet of air extends from the fan and spreads laterally across the tunnel's cross-section.
* Mixing and Dilution: The induced airflow mixes with the tunnel's ambient air, diluting pollutants and ensuring uniform air distribution throughout the tunnel's width.
* Smoke Control: In case of a fire incident, jet fans help control the lateral spread of smoke, preventing it from descending to the roadway and maintaining visibility for safe evacuation.
* Temperature Control: Jet fans facilitate heat dissipation, ensuring that excessive heat generated during fire incidents or hot....
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