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Atomization and hypergolic reactions of impinging streams of monomethylhydrazine and dinitrogen tetroxide

机译:一甲基肼和四氧化二氮撞击流的雾化和高声反应

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Impinging liquid jets of monomethylhydrazine (MMH) and MON3 (i.e. dinitrogen tetroxide containing 3 wt% NO) were observed with high-speed cameras in order to explore fluid and flame behaviors in the impinging region. At the beginning of the impingement, a portion of the fluids that turned yellow in the impinging region was considered the NO2 and N2O4 vapors or chemical condensate, while the white fogs were regarded mainly as the spreading MMH vapor. Auto-ignition occurred less than 5 ms after impingement, followed by the propagation of orange flames. Due to hypergolicity, orange and blue white flames were held near the rim of the liquid sheet of the impinging jets. The orange flames tended to exist near the MON3 jets, while the blue-white flames spread on the side of the MMH jets. When atomization was so weak that a long liquid sheet was formed, the MMH and MON3 jets were separated by the orange flames. The atomization performance significantly affected the ignition delay time, as well as combustion efficiency and stability. However, even under strong atomization conditions, the liquid MMH and MON3 jets at a steady state are regarded as the impinging immiscible fluid jets. (C) 2017 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译:用高速照相机观察了单甲基肼(MMH)和MON3(即四氧化二氮中含有3 wt%NO)的撞击液体喷射器,以探索撞击区域的流体和火焰行为。在撞击开始时,一部分在撞击区域变成黄色的流体被视为NO2和N2O4蒸气或化学冷凝物,而白色雾主要被视为传播的MMH蒸气。撞击后不到5毫秒发生自燃,随后橙色火焰蔓延。由于极高的清爽性,橙色和蓝色白色的火焰在撞击射流的液体层边缘附近保持着。 MON3喷气机附近倾向于存在橙色火焰,而MMH喷气机的侧面则蔓延着蓝白色火焰。当雾化太弱而无法形成较长的液体片时,MMH和MON3喷嘴会被橙色火焰分开。雾化性能显着影响点火延迟时间以及燃烧效率和稳定性。但是,即使在强雾化条件下,处于稳态的液态MMH和MON3射流也被视为撞击的不混溶流体射流。 (C)2017燃烧研究所。由Elsevier Inc.出版。保留所有权利。

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