investigation of a prototype industrial gas turbine combustor using ...

3. Experimental setups
Figure 3.2: The dual fan system with heaters and flow meters.
Before a vertical straight pipe leading to the burner, the Main and Pilot
air coming from the dual fan system takes a 90° bend. To minimize secondary
flow and to achieve a more even flow profile, the set up included
two 10 cm flow straighteners consisting of a square tube matrix. The flow
straighteners were placed both in the bottom pipe and in the connection
pipe leading up to the burner section. The vertical pipe section leading
to the burner was equipped with connections for temperature measurements,
pressure measurements and injectors for PIV particles. The seeding
injector air flow was controlled separately with a needle valve, and
measured using a Coriolis mass flow meter.
After the burner, three different alternative liners could be interchangeably
connected. The first liner, which was used for the atmospheric
emissions and lean blowout publications [21,22], was a 700 mm long stainless
steel pipe with a 85 mm diameter which contracted to a diameter of
50 mm at the end (Figure 3.3). After the contraction, a pipe extended a
20