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首页> 外文期刊>Combustion and Flame >Laminar burning velocities of C_2H_4/N_2O flames: Experimental study and its chemical kinetics mechanism
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Laminar burning velocities of C_2H_4/N_2O flames: Experimental study and its chemical kinetics mechanism

机译：C_2H_4 / N_2O火焰的层流燃烧速度：实验研究及其化学动力学机理

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Nitrous oxide fuel blend propellants have great potential to be used in rocket engine, and investigations on the fundamental combustion characteristics of such propellants are therefore necessary to control flashback and develop their chemical kinetics mechanism. Laminar burning velocities (LBVs) of C2H4/N2O flames are measured by using spherical expansion flames in this paper at 0.5-2.0 atm and 280 K. The present method for upper and lower limits of effective flame radius is reasonable for the experimental stretched flame speeds can be fitted very well with the flame stretch rates. The LBVs of C2H4/N2O flames are smaller than those of C2H4/N-2/O-2 flames (same N/O ratio as N2O) at conditions near stoichiometric ratio, while they are larger than those at other conditions especially at fuel-rich side. The LBVs of C2H4/N2O flames are not sensitive to the pressure in the measured range. Two kinds of sub-mechanisms are applied for detailed chemical kinetics mechanisms of C2H4/N2O reactions, which are USC Mech II-2 for hydrocarbon reactions as well as GRI 3.0 mechanism and San Diego mechanism for nitrogen oxide reactions respectively. Eight key elementary reactions are chosen based on the sensitivity analysis, and the effects of their available rate constants from literatures on the LBVs are tested. Modified mechanisms for C2H4/N2O reactions are therefore proposed by replacing the rate constants of these key elementary reactions, which predicts well for LBVs of hydrocarbon/N2O flames. Sensitivity analyses are performed for C2H4/N2O flames at different equivalence ratios, it is found that the N2O decomposition is a dominant reaction in conditions near stoichiometric ratio, while it is the codominant and nondominant reaction in fuel-lean and fuel-rich conditions respectively. Furthermore, the reaction pathways of oxidizers consumption in C2H4/N2O flames and C2H4/N-2/O-2 flames are analyzed, and the observations on the LBVs of these two flames in the experiment can be well explained through the reaction pathways and their relative changes under fuel-lean, stoichiometric and fuel-rich conditions. (C) 2019 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译：一氧化二氮燃料混合推进剂具有用于火箭发动机的巨大潜力，因此有必要对此类推进剂的基本燃烧特性进行研究，以控制回火并发展其化学动力学机理。本文使用球形膨胀火焰在0.5-2.0 atm和280 K的条件下测量C2H4 / N2O火焰的层流燃烧速度（LBVs）。有效火焰半径的上限和下限的本方法对于实验拉伸火焰速度是合理的可以很好地适应火焰拉伸速率。在接近化学计量比的条件下，C2H4 / N2O火焰的LBV小于C2H4 / N-2 / O-2火焰的LBV（N / O比与N2O相同），但比其他条件下的LBV更大，尤其是在燃料条件下。丰富的一面。 C2H4 / N2O火焰的LBV对测量范围内的压力不敏感。 C2H4 / N2O反应的详细化学动力学机理应用了两种子机理，分别是用于烃反应的USC Mech II-2以及用于氮氧化物反应的GRI 3.0机理和San Diego机理。基于敏感性分析，选择了八个关键的基本反应，并测试了文献中可用的速率常数对LBV的影响。因此，通过替代这些关键元素反应的速率常数，提出了用于C2H4 / N2O反应的改进机理，这对于烃/ N2O火焰的LBV预测良好。对不同当量比的C2H4 / N2O火焰进行了敏感性分析，发现N2O分解是在接近化学计量比的条件下的主要反应，而在稀燃和富油条件下分别是显性和非显性反应。此外，分析了C2H4 / N2O火焰和C2H4 / N-2 / O-2火焰中氧化剂消耗的反应途径，并通过反应途径及其反应可以很好地解释实验中这两种火焰的LBV的观察结果。贫油，化学计量和富油条件下的相对变化。 （C）2019燃烧研究所。由Elsevier Inc.出版。保留所有权利。

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