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4.2. The Inlet System and the Mixing Chamber
The details given in the following chapter only apply to VKL 10!
Figure 4.1. shows a cross-section of the dilution stage. Particle-free air with a volume flow
rate V
determined by the pre-pressure P, flows through an annular slit around the inlet
r
nozzle. The resulting under-pressure dP
sucked in and to be mixed homogeneously with clean air in the mixing chamber. If the clean
air flow rate is increased, the flow speed within the annular nozzle increases
correspondingly. This causes according to Bernoulli (s. below) the under-pressure dP
inlet nozzle to increase, and the flow rate V
through the underpressure, and equally depend on it. Consequently, the ratio of the flow
rates remains constant for different pre-pressures, P.
Bernoulli formula:
dP = 1/2 * rho * v²
dP:
pressure drop at a nozzle (here: under-pressure)
rho:
gas density
v:
gas velocity through the nozzle
compressed air
V
r
with pre-pressure P
V
in
inlet nozzle
annular nozzle
mixing chamber
Fig. 4.1.: Cross section of dilution stage
V
V005-06-2020
ERSION
causes the aerosol which is to be diluted, to be
0
increases, too. Both flow rates are connected
an
dP
0
excess air outlet
O
M
VKL 10 /100
PERATION
ANUAL
0
V
out
outlet nozzle
excess air
tube connector
at the
9
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