Etude de la combustion de gaz de synthèse issus d'un processus de ...

Chapter 3
nair
4.76( f φ)
P = P =
P
n a + b + c + d + e + 4.76 ( f φ)
air m m
m
(3.7)
Where φ is the equivalence ratio. The syngas-air mixture was prepared within the
combustion chamber. The initial conditions were strictly controlled in the experiments to
realize the same initial pressure and temperature. For avoiding the influence of wall
temperature on mixture temperature, an enough interval between two experiments is
set, providing enough time for wall to cool down to the room temperature.
3.1.2 Rectangular chamber
tel-00623090, version 1 - 13 Sep 2011
The static rectangular combustion chamber shown in figure 3.1 has two transparent
sides in ordinary glass (BK7) providing large enough optical access to schlieren
photography. The inside size of the rectangular chamber is 70 mm width, 58 mm length
and 120 mm height. The material of the chamber is duraluminum (AU4G).
Electrode
Injector
Exhaust
valve
Figure 3.1 – Rectangular combustion chamber
The pressure is recorded by a dynamic sensor Kistler 601A installed in the bottom side
of the chamber with resolution of 0.1 mbar. The chamber has an admission/exhaustion
valve for mixture admission and combustion gases exhaustion.
The Synerjet-Orbital injector installed on the top surface of the chamber was conceived
by Malheiro, (2002). This chamber is able to embrace the ignition electrode in three
different positions. This type of electrodes conception allows the possibility to change
the spark position in the combustion chamber and also allows the variation of the
electrode gap. Such as Malheiro, (2002), the electrode gap employed in the
experiments was 2.0 mm.
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