Details of the Thermal Distribution in the Combustion Vessel for Spray A
Figure 18.104.22.168 shows the average gas temperature at various positions in the “core” region of the vessel, relative to predictions based on a single relationship between Tcore and Tbulk (i.e., using only the measured pressure to predict Tcore). Along the axis of the spray, the gas temperature is uniform within 1%, except for a measurement point in the boundary layer only 1 mm in front of the injector tip. Temperature is also uniform along the same horizontal plane (y = 0, z = ±15 mm) outside of the spray. The most significant variation is in the vertical direction (y = ±15 mm, z = 0) where the temperature varies by ± 4% for a vertical change of ± 15 mm. This vertical stratification is obviously caused by buoyancy effects. Please see Meijer 2012 for more details.
Figure 22.214.171.124 Average gas temperature in the “core” region of the combustion vessel at Spray A conditions, 0% O2
Schlieren and broadband chemiluminescence movies of the premixed combustion and cooldown processes, along with temperature measurements throughout these events, are described in Pickett SAE 2010-01-2106 and Maes 2020 (in review).