Ventilation control of unidirectional urban tunnels with on- and off- ramps

S. Abe, T. Matsumoto, I. Nakahori, A. E. Vardy

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

A new control system is presented for ventilation systems in road tunnels with on-ramps and off-ramps. It is assumed that each limb of the tunnel has unidirectional traffic and that the ventilation system is longitudinal, based on point extract though a ventilation shaft and groups of jet fans in the main tunnel limbs. The overall objective is to find the fan settings that require the minimum power necessary to maintain acceptable air quality in the tunnel and to minimize the escape of pollutants through tunnel portals. Two control methods are described, both of which utilize a simulator to predict future conditions based on input information that can be readily available in tunnels. The simpler one, based on quasi-steady approximations, is already in practical use. The more powerful one extends the simpler method to include (i) a feed-back module that responds to differences between predicted and actual airflow velocities and pollution concentrations and (ii) a feed forward module based on a traffic simulator. The performance of both control methods is assessed using a virtual tunnel and the new method is shown to have worthwhile advantages over the quasi-steady method.

Original languageEnglish
Title of host publication17th International Symposium on Aerodynamics, Ventilation and Fire in Tunnels 2017, ISAVFT 2017
Place of PublicationUnited States
PublisherBHR Group Limited
Pages149-165
Number of pages17
ISBN (Print)9781510851665
Publication statusPublished - Dec 2017
Event17th International Symposium on Aerodynamics, Ventilation and Fire in Tunnels 2017, ISAVFT 2017 - Lyon, France
Duration: 13 Sep 201715 Sep 2017

Conference

Conference17th International Symposium on Aerodynamics, Ventilation and Fire in Tunnels 2017, ISAVFT 2017
CountryFrance
CityLyon
Period13/09/1715/09/17

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  • Cite this

    Abe, S., Matsumoto, T., Nakahori, I., & Vardy, A. E. (2017). Ventilation control of unidirectional urban tunnels with on- and off- ramps. In 17th International Symposium on Aerodynamics, Ventilation and Fire in Tunnels 2017, ISAVFT 2017 (pp. 149-165). BHR Group Limited.