SIMULATION OF AIR FLOWS IN VENTILATION SHELTERS
K. I. Logachev,
I. V. Kryukov,
and O. A. Averkova
Translated from Novye Ogneupory, No. 8, pp. 57–62, August, 2015.
Original article submitted February 5, 2015.
The process of recirculation of air in a feeding channel – bypass chamber system installed at the inlet to a ven
tilation shelter is simulated with the use of a numerical and a field experiment.
Keywords: ventilation shelter, recycling, bypassing.
The use of ventilation shelters is the most reliable,
though energy-intensive, method of localization of dust
emission 1, 2]. In order to reduce the energy intensity of ven-
tilation shelters it is necessary to reduce the volume of venti-
lation, which is composed of the volume of expelled air
[3 – 6] and the volume of air entering through leakages
[7 – 15]. One method of reducing the volume of expelled air
is through bypassing, a technique that utilizes the phenome
non of recirculation of air.
The objective of the present study is to investigate the in
fluence of the phenomenon of air recirculation in the case of
frontal leakage of air in a feeding channel — bypass chamber
system installed at the inlet to a ventilation shelter.
The experimental plant consists of a lower container
made of wood-fiber boards with upper container made of
cardboard, a feeding pipe made of polyvinylchloride, and a
cylindrical bypass chamber twisted from sheet laminate of
polyethylene terephthalate. A vertical partition that divides
the cavity of the container into a receiving and a ventilation
cavity is installed in the lower container. The feeding pipe
and the bypass chamber connect the lower and upper con
tainers of the shelter. The feeding pipe is secured to the lower
container by means of a bolt that passes through the cavity of
the container. A round opening with diameter equal to the di-
ameter of the bypass chamber is created in the upper cover of
the lower container. The bypass chamber rests on the bolt.
The upper parts of the bypass chamber and the feeding pipe
are connected by a bolt, which does not allow the feeding
pipe to fall while it maintains it coaxial with the bypass
chamber. The upper container, which is provided with a
round opening, is encased in the bypass chamber. An axial
ventilator, which simulates the flow of expelled air, is found
at the center of the feeding pipe. An axial ventilator that re
moves air from the container is mounted on the lateral wall
of the lower container (ventilated part). The slots in the con
nections are insulated. A diagram of the experimental plant is
presented in Figs. 1 and 2. Smoke that is fed through a small
pipe into the bypass chamber is used to display the dynamics
of the air flows.
The smoke rises upwards in the case of a diameter of the
bypass chamber of 0.2 m when the discharge ventilator is
functioning (Fig. 3). Consequently, a discharging process is
created in the upper container and along the entire length of
the bypass chamber. With the combined action of both venti
lators (Fig. 4) the smoke also travels upwards, but spreads
over the lateral wall of the bypass chamber (the spreading
could also occur due to strong feeding of the smoke). Mea
surements of the speed of the air performed by a hot-wire an
emometer with joint action of the ventilators demonstrated
that the speed of the air from the wall of the feeding pipe to
the wall of the bypass chamber grows. When the exhaust
Refractories and Industrial Ceramics Vol. 56, No. 4, November, 2015
1083-4877/15/05604-0428 © 2015 Springer Science+Business Media New York
FGAOU VPO Shukhov Ural State Technological University, Bel