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Título
A Discussion on the Effective Ventilation Distance in Dead-End Tunnels
Autor
Facultad/Centro
Área de conocimiento
Título de la revista
Energies
Número de la revista
17
Cita Bibliográfica
Pereiras, B.; Sierra Fernández, C. M.; Miguel González, C.; García Díaz, M. (2019). A Discussion on the Effective Ventilation Distance in Dead-End Tunnels. Energies, 12(17), https://doi.org/10.3390/EN12173352
Editorial
MDPI
Fecha
2019
Resumen
[EN] Forcing ventilation is the most widely used system to remove noxious gases from a working
face during tunnel construction. This system creates a region near the face (dead zone), in which
ventilation takes place by natural diffusion, rather than being directly swept by the air current. Despite
the extensive use of this system, there is still a lack of parametrical studies discerning the main
parameters affecting its formation as well as a correlation indicating their interrelation. With this aim
in mind, computational fluid dynamics (CFDs) models were used to define the dead zone based on
the airflow field patterns. The formation of counter vortices, which although maintain the movement
of air hinder its renewal, allowed us to discuss the old paradigm of defining the dead zone as a very
low air velocity zone. Moreover, further simulations using a model of air mixed with NO2 offered an
idea of NO2 concentrations over time and distance to the face, allowing us to derive at a more realistic
equation for the effective distance. The results given here confirm the degree of conservativism of
present-day regulations and may assist engineers to improve ventilation efficiency in tunnels by
modifying the duct end-to-face distance
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