Studies on injection and mixing characteristics of high pressure hydrogen and oxygen jet in argon atmosphere
Studies on injection and mixing characteristics of high pressure hydrogen and oxygen jet in argon atmosphere
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氩气氛下高压氢氧射流喷射混合特性研究
DOI：
10.1016/j.fuel.2018.04.038
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发表时间：
2018-08-15
期刊：
影响因子：
7.4
通讯作者：
Li, Liguang
中科院分区：
文献类型：
--
作者：
Deng, Jun;Zhong, Huiping;Li, Liguang
氩循环氢发动机用氩气代替大气中的氮气，提高了发动机效率，避免了NOx的生成。由于喷射气体和环境气体分子量的差异，该发动机提出了两种喷射策略。本文利用纹影法测量了Ar气氛中H2和O2非反应射流的特性。实验结果表明，注射压力的增加或环境压力的降低导致针入度的增加。O-2的射流穿透长度比H-2略低0- 6%。气体射流的扩散角随喷射压力和环境压力的增大而略有增大。在所有实验压力边界条件下，氢射流的扩散角在31 ° ~ 36 °之间，氧射流的扩散角在22 ° ~ 28 °之间。气体射流的卷吸率随喷射压力、环境压力和喷射时间的增加而增加。由于O-2射流的体积流量较低，O-2射流的卷吸率是H-2射流的2.43-2.98倍。H-2射流具有较大的穿透角和弥散角，因而携带的氩气总量较大。实际发动机更喜欢使用氢喷射策略。
Ar-circulated hydrogen engine replaces atmospheric nitrogen with Ar so as to increase engine efficiency and avoid NOx forming. Due to the differences in gas molecular weight of injection gas and ambient gas, two injection strategies were proposed for this engine. This study aims at measuring the characteristics of non-reactive H-2 and O-2 jets in Ar atmosphere by Schlieren method. The experimental results demonstrate that the increase of injection pressure or the decrease of ambient pressure leads to an increase of penetration. Jet penetration length of O-2 is slightly lower than H-2 by 0-6%. The dispersion angle of gas jet increases slightly with the increase of injection pressure and ambient pressure. Under all the experimental pressure boundary conditions, the dispersion angles of H-2 jets are between 31 degrees and 36 degrees and the dispersion angles of O-2 jets are between 22 degrees and 28 degrees. The entrainment rate of gas jet increases with the increase of injection pressure, ambient pressure and injection time. Jet entrainment rate of O-2 is 2.43-2.98 times that of H-2 jet because of the lower volume flow rate of O-2 jet. H-2 jet entrains more total argon volume for its higher penetration and dispersion angle. The actual engine prefers to use the hydrogen injection strategy.