Experimental Investigation of Air and Methane Injection from In-Stream Fueling Pylons

Abstract

This paper covers experimental results for in-stream fuel injectors in a Mach number 1.95 air∞ow. Three fuel injection pylon conflgurations studied include a basic pylon, a ramp pylon, and an alternating wedge pylon. The flrst pylon is a baseline conflguration. The latter two introduce streamwise vorticity into the ∞ow to increase mixing action via their trailing edge geometries. A cold ∞ow study with fuel injection is accomplished to compare the three pylons mixing capabilities and pressure losses. Three experimental techniques are used: aerothermal probing, Raman spectroscopy, and nitric-oxide planar laser induced ∞uorescence (NO-PLIF). Aerothermal probing and NO-PLIF are accomplished with air injection from the pylons, while Raman spectroscopy is accomplished with methane injection. The ramp and alternating wedge pylons show decisive increases in mixing capability compared with the basic pylon. They also exhibit a slight increase in total pressure loss compared with the basic pylon.