On the Formation of Nitrogen Oxides During the Combustion of ...

3.2 Measurement Techniques and Data Acquisition
3.2.6 Experiment Sequence and Operational Parameters
In order to perform an experiment run, a droplet array is generated by the
droplet array generation system at an ambient temperature T ∞ of 300 to 315K
(Fig. 3.18). The droplets are suspended onto the droplet array holder by a
fuel pump through fine glass tubes. Each droplet is suspended at the intersection
of a pair of X-shaped 14µm SiC fibers, which imparts lowest residual
motion and highest sphericity (Chap. 3.1.2) [282]. The shutter at the bottom
of the combustion chamber is opened and the droplet array holder with the
droplet array is lifted into the preheated combustion chamber by the droplet
lifting system. Pre-vaporization of the droplets is performed at an elevated
temperature level of T Ψ . Depending on the predefined degree of vaporization
Ψ, an ignition wire ignites one end of the droplet array to initiate com-
Preparation activities
Droplet generation and
quality check of droplet array
Time t
−700
0
600
ms
Opening of combustion chamber shutter and
lift-up of droplet array holder
Ignition
650 ms: backlit LED off
Combustion
µg
4740
Exhaust gas sampling
Moving down of droplet array holder and
closing of combustion chamber shutter
Figure 3.18: Experiment Sequence of TEXNOX Drop Tower Campaign.
starts at t = 0 s and lasts for 4.74s (not to scale here) [104].
Microgravity time
99