A high pressure experimental and numerical study of methane ignition
A high pressure experimental and numerical study of methane ignition
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DOI：
10.1016/j.fuel.2016.03.016
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发表时间：
2016-08
期刊：
影响因子：
7.4
通讯作者：
H. E. Merhubi;A. Kéromnès;G. Catalano;B. Lefort;L. L. Moyne-L.
中科院分区：
文献类型：
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作者：
H. E. Merhubi;A. Kéromnès;G. Catalano;B. Lefort;L. L. Moyne-L.
设计并验证了一种高压激波管HPST，用于高温高压下的化学动力学研究。利用该装置，对甲烷在10、20和40 bar和1400 K至2000 K温度下的自燃进行了研究。本文研究了甲烷/氧气/氩气混合物在稀释条件下（氩气> 90%）的三种当量比（λ = 0.5，1和2）。实验数据与文献中常用的三种不同化学动力学模型（Aramco Mech 1.3，USC Mech II和GRI Mech 3.0）的先前文献测量和预测结果吻合良好，这证实了新高压激波管获得的实验数据的质量，并允许将点火延迟时间机制的验证范围扩展到更高的压力。为解释点火延迟时间预测所观察到的差异而进行的调查强调了USC机制预测对当量比的重要敏感性和对CH 3 + O2反应的重要敏感性。最后，压力和当量比对点火延迟时间的影响进行了评估，在一个广泛的范围内的压力（1-50巴）和当量比（λ = 0.2-3）。
A high pressure shock tube “HPST” has been designed and validated for the purpose of chemical kinetics studies at elevated pressures and temperatures. Using this facility, auto-ignition investigations are conducted for methane at 10, 20 and 40 bar and temperatures from 1400 K up to 2000 K. Three equivalence ratios (ϕ= 0.5, 1 and 2) for a methane/oxygen/argon mixture were studied in this paper under diluted conditions (argon > 90%). Experimental data showed good agreement with previous literature measurements and predictions from three different chemical kinetic models (Aramco Mech 1.3, USC Mech II and GRI Mech 3.0) commonly used in the literature, which confirms the quality of the experimental data obtained with the new high pressure shock tube and allows the expansion of the validation range of the mechanisms for ignition delay times to higher pressures. The investigations performed to explain the differences observed for ignition delay times predictions highlighted an important sensitivity of the USC mechanism predictions to equivalence ratio and an important sensitivity to CH3+ O2reactions. Finally, the impact of pressure and equivalence ratio on ignition delay time is evaluated over a broad range of pressure (1–50 bar) and equivalence ratio (ϕ= 0.2–3).