Numerical Simulation in the Air-Curtain Installed Subway Tunnel for the Indoor Air Quality
The Platform Screen Doors improve Indoor Air Quality
(IAQ) in the subway station; however, and the air quality is degraded
in the subway tunnel. CO2 concentration and indoor particulate matter
value are high in the tunnel. The IAQ level in subway tunnel degrades
by increasing the train movements. Air-curtain installation reduces
dusts, particles and moving toxic smokes and permits traffic by
generating virtual wall. The ventilation systems of the subway tunnel
need improvements to have better air-quality. Numerical analyses
might be effective tools analyze the flowfield inside the air-curtain
installed subway tunnel. The ANSYS CFX software is used for steady
computations of the airflow inside the tunnel. The single-track subway
tunnel has the natural shaft, the mechanical shaft, and the PSDs
installed stations. The height and width of the tunnel are 6.0 m and 4.0
m respectively. The tunnel is 400 m long and the air-curtain is installed
at the top of the tunnel. The thickness and the width of the air-curtain
are 0.08 m and 4 m respectively. The velocity of the air-curtain
changes between 20 - 30 m/s. Three cases are analyzed depending on
the installing location of the air-curtain. The discharged-air through
the natural shafts increases as the velocity of the air-curtain increases
when the air-curtain is installed between the mechanical and the
natural shafts. The pollutant-air is exhausted by the mechanical and the
natural shafts and remained air is pushed toward tunnel end. The
discharged-air through the natural shaft is low when the air-curtain
installed before the natural shaft. The mass flow rate decreases in the
tunnel after the mechanical shaft as the air-curtain velocity increases.
The computational results of the air-curtain installed tunnel become
basis for the optimum design study. The air-curtain installing location
is chosen between the mechanical and the natural shafts. The velocity
of the air-curtain is fixed as 25 m/s. The thickness and the blowing
angles of the air-curtain are the design variables for the optimum
design study. The object function of the design optimization is
maximizing the discharged air through the natural shaft.
[1] J. H. Lee, and M. D. Oh, 1998, "Train Wind in the Subway Tunnel", The
Magazine of the Society of Air-Conditioning and Refrigerating Engineers
of Korea, vol.27, pp. 109~114 (in Korean).
[2] J. Song, H. Lee, S. Kim, and D. Kim, 2008, "How about the IAQ in
subway environment and its management?" Asian Journal of
Atmospheric Environment, vol.2-1, pp. 60-67.
[3] Roberson P., and Shaw BH., 1978, "The linear air curtain as a particulate
barrier", Journal of Environmental Science, vol.21, pp.32-33
[4] H. L. Karlsson, L. Nilsson, and L. Moller, 2005, "Subway particle are
more genotoxic than street particles and induce oxidative stress in
cultured human lung cells", Chem. Res. Toxicol, vol. 18, pp. 19-23.
[5] Gupta, S., Pavageau, M., and Elicer-Cortes, J.C., 2006, "Cellular
confinement of tunnel sections between two air curtains", Building and
Environment, vol. 42, pp.3352-3365
[6] ANSYS CFX, 2009, ANSYS Workbench, ICEM-CFD, CFX-Pre,
CFX-Solver, CFX-Post User-s Manual.
[7] Guyonnaud, L, Solliec, C, Dufresne de Virel, M and Rey, C, 2000,
"Design of air curtains used for area confinement in tunnels",
Experiments in Fluids, vol. 28, pp.377-384
[8] F.R. Menter, 1994, "Two-equation eddy-viscosity turbulence models for
engineering applications" AIAA-Journal., vol.32, pp. 269-289.
[9] S. Tokarek, and A. Bernis, 2006, "An example of particle concentration
reduction in Parisian subway stations by electrostatic precipitation",
Environmental Technology, vol.27, pp. 1279-1287.
[10] Y. D. Huang, W. Gao, and C. N. Kim, 2010, "A numerical study of the
train-induced unsteady airflow in a subway tunnel with natural
ventilation ducts using the dynamic layering method", Journal of
Hydrodynamics, vol. 22, pp.164-172.
[11] J. Modic, 2003, "Fire simulation in road tunnels", Tunnelling and
Underground Space Technology", vol. 18, pp. 525-530.
[1] J. H. Lee, and M. D. Oh, 1998, "Train Wind in the Subway Tunnel", The
Magazine of the Society of Air-Conditioning and Refrigerating Engineers
of Korea, vol.27, pp. 109~114 (in Korean).
[2] J. Song, H. Lee, S. Kim, and D. Kim, 2008, "How about the IAQ in
subway environment and its management?" Asian Journal of
Atmospheric Environment, vol.2-1, pp. 60-67.
[3] Roberson P., and Shaw BH., 1978, "The linear air curtain as a particulate
barrier", Journal of Environmental Science, vol.21, pp.32-33
[4] H. L. Karlsson, L. Nilsson, and L. Moller, 2005, "Subway particle are
more genotoxic than street particles and induce oxidative stress in
cultured human lung cells", Chem. Res. Toxicol, vol. 18, pp. 19-23.
[5] Gupta, S., Pavageau, M., and Elicer-Cortes, J.C., 2006, "Cellular
confinement of tunnel sections between two air curtains", Building and
Environment, vol. 42, pp.3352-3365
[6] ANSYS CFX, 2009, ANSYS Workbench, ICEM-CFD, CFX-Pre,
CFX-Solver, CFX-Post User-s Manual.
[7] Guyonnaud, L, Solliec, C, Dufresne de Virel, M and Rey, C, 2000,
"Design of air curtains used for area confinement in tunnels",
Experiments in Fluids, vol. 28, pp.377-384
[8] F.R. Menter, 1994, "Two-equation eddy-viscosity turbulence models for
engineering applications" AIAA-Journal., vol.32, pp. 269-289.
[9] S. Tokarek, and A. Bernis, 2006, "An example of particle concentration
reduction in Parisian subway stations by electrostatic precipitation",
Environmental Technology, vol.27, pp. 1279-1287.
[10] Y. D. Huang, W. Gao, and C. N. Kim, 2010, "A numerical study of the
train-induced unsteady airflow in a subway tunnel with natural
ventilation ducts using the dynamic layering method", Journal of
Hydrodynamics, vol. 22, pp.164-172.
[11] J. Modic, 2003, "Fire simulation in road tunnels", Tunnelling and
Underground Space Technology", vol. 18, pp. 525-530.
@article{"International Journal of Mechanical, Industrial and Aerospace Sciences:52097", author = "Kyung Jin Ryu and Makhsuda Juraeva and Sang-Hyun Jeong and Dong Joo Song", title = "Numerical Simulation in the Air-Curtain Installed Subway Tunnel for the Indoor Air Quality", abstract = "The Platform Screen Doors improve Indoor Air Quality
(IAQ) in the subway station; however, and the air quality is degraded
in the subway tunnel. CO2 concentration and indoor particulate matter
value are high in the tunnel. The IAQ level in subway tunnel degrades
by increasing the train movements. Air-curtain installation reduces
dusts, particles and moving toxic smokes and permits traffic by
generating virtual wall. The ventilation systems of the subway tunnel
need improvements to have better air-quality. Numerical analyses
might be effective tools analyze the flowfield inside the air-curtain
installed subway tunnel. The ANSYS CFX software is used for steady
computations of the airflow inside the tunnel. The single-track subway
tunnel has the natural shaft, the mechanical shaft, and the PSDs
installed stations. The height and width of the tunnel are 6.0 m and 4.0
m respectively. The tunnel is 400 m long and the air-curtain is installed
at the top of the tunnel. The thickness and the width of the air-curtain
are 0.08 m and 4 m respectively. The velocity of the air-curtain
changes between 20 - 30 m/s. Three cases are analyzed depending on
the installing location of the air-curtain. The discharged-air through
the natural shafts increases as the velocity of the air-curtain increases
when the air-curtain is installed between the mechanical and the
natural shafts. The pollutant-air is exhausted by the mechanical and the
natural shafts and remained air is pushed toward tunnel end. The
discharged-air through the natural shaft is low when the air-curtain
installed before the natural shaft. The mass flow rate decreases in the
tunnel after the mechanical shaft as the air-curtain velocity increases.
The computational results of the air-curtain installed tunnel become
basis for the optimum design study. The air-curtain installing location
is chosen between the mechanical and the natural shafts. The velocity
of the air-curtain is fixed as 25 m/s. The thickness and the blowing
angles of the air-curtain are the design variables for the optimum
design study. The object function of the design optimization is
maximizing the discharged air through the natural shaft.", keywords = "air-curtain, indoor air quality, single-track subway
tunnel", volume = "6", number = "3", pages = "586-5", }