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

3. Experimental setups
3.1 The laminar flame speed setup
The laminar flame speed for a range of fuels was investigated, to
obtain a better understanding of how well different fuels burn (Table
3.1). The experimental methodology for measuring the flame speed was
based on the half-angle method [33]. This method uses the measured
half-angle of the flame (Figure 3.1) to calculate the flame speed (3.1).
S L = u sin α, (3.1)
The flame angle was obtained by locating the flame edge using a Schlieren
Figure 3.1: Flame half-angles before correction for camera misalignment
[30].
set up. The Schlieren measurement technique is described in Chapter 5.
The burner used in the experiments was of Bunsen-burner type, where
the fuel and air was mixed before entering the bottom of a 500 mm tube.
The tube converged to the exit diameter. The exit of the burner was
adjustable, by use of three different exit nozzles, to ensure stable combustion
and to avoid flashback. The exit diameters used were 13 mm,
10 mm and 4 mm. The larger diameter was needed to measure lower lam-
18