Fuel/Air Mixing in Reacting and Non-reacting Flows within a Dual-mode Combustor

IF 0.7 4区工程技术 Q4 ENGINEERING, AEROSPACE Transactions of the Japan Society for Aeronautical and Space Sciences Pub Date : 2021-01-01 DOI:10.2322/TJSASS.64.71

T. Arakawa, Kiyoshi Nojima, Kan Kobayashi, S. Tomioka

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Abstract

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 air ﬂ ow, fuel (H 2 or C 2 H 4 ) or inert gas (He, N 2 or Ar) were perpendicularity injected from plural circular ori ﬁ ces into high- or room-temperature M2.5 air ﬂ ows decelerated through pseudo-shockwave systems. Under similar dynamic pressure ratios, fuel mass ﬂ ux contours downstream of the injector were similar between the H 2 and C 2 H 4 reacting cases. However, fuel mass ﬂ ux contours were di ﬀ erent between the C 2 H 4 reacting and Ar non-reacting cases due to the heat-release e ﬀ ect during local mixing. On the other hand, heat-release e ﬀ ect on mixing e ﬃ ciency was found to be minor in bulk-scale mixing evaluation. It was found that C 2 H 4 mixing e ﬃ ciency 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.

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双模燃烧室中反应流和非反应流中的燃料/空气混合

对双模燃烧室内燃料与空气的混合特性进行了实验研究。为了确定燃料与气流混合特性的主要参数，将燃料(h2或c2h2)或惰性气体(He, n2或Ar)从复数圆形喷嘴垂直注入通过伪冲击波系统减速的高温或室温M2.5气流中。在相似的动压比下，h2和c2h2反应情况下喷油器下游的燃油质量流量曲线相似。然而，由于局部混合过程中的放热效应，甲烷反应和氩气不反应情况下的燃料质量通量曲线有所不同。另一方面，在大规模混合评价中，热释放对混合效率的影响较小。结果表明，在相似的动压比和峰压条件下，当量比为1.6的碳氢混合效率与氩混合结果的预测误差在几个百分点以内。

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