Fuel/Air Mixing in Reacting and Non-reacting Flows within a Dual-mode Combustor
2021 年 64 巻 2 号 p. 71-81
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2021 年 64 巻 2 号 p. 71-81
An experimental investigation on fuel and air mixing characteristics within a dual-mode combustor is presented. To determine the dominant parameters of mixing characteristics of fuel with airflow, fuel (H2 or C2H4) or inert gas (He, N2 or Ar) were perpendicularity injected from plural circular orifices into high- or room-temperature M2.5 airflows decelerated through pseudo-shockwave systems. Under similar dynamic pressure ratios, fuel mass flux contours downstream of the injector were similar between the H2 and C2H4 reacting cases. However, fuel mass flux contours were different between the C2H4 reacting and Ar non-reacting cases due to the heat-release effect during local mixing. On the other hand, heat-release effect on mixing efficiency was found to be minor in bulk-scale mixing evaluation. It was found that C2H4 mixing efficiency with an equivalence ratio of 1.6 could be predicted within an error of a few percent from Ar mixing results under similar dynamic pressure ratio and similar peak pressure.
