Abstract Considering the available experimental investigations of auto-ignition behaviors of N2O-C2 hydrocarbons propellants are limited in high-temperature regime, in the work the ignition delay times for N2O-C2H4 propellants have been measured under the conditions of TC = 885–940 K, PC = 2.5–4.3 MPa, φ = 1.05 and 1.35 using the rapid compression machine experiments. Then the relational expression between ignition delay time and condition factors is derived as l g τ i g = 11.78 1000 / T c - 0.26 P c - 0.83 φ - 9.41 by linear fitting. The expression can be used to predict ignition delay times of N2O-C2H4 propellants in practice. Moreover, the calculated ignition delay times by three kinetic models are compared with experimental data. The results show that these models can well predict ignition behaviors at high temperature regime, but fail at low-temperature regime. Through temperature sensitivity analysis, at high-temperature regime the N2O decomposition reaction has the highest sensitivity coefficient and dominated the overall reaction. While at low-temperature regime, the oxidation reactions of N2O and hydrocarbons become more important steps. For better prediction of low-temperature ignition behaviors, the low-temperature oxidation mechanism of N2O and hydrocarbons needs further development, and the kinetic parameters of the highly sensitive reactions should be improved.

中文翻译：

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快速压缩机中环氧乙烷推进剂自燃的实验研究

摘要 考虑到现有的 N2O-C2 烃类推进剂自燃行为实验研究受限于高温环境，在工作中测量了 N2O-C2H4 推进剂在 TC = 885-940 K 条件下的点火延迟时间, PC = 2.5–4.3 MPa, φ = 1.05 和 1.35 使用快速压缩机实验。然后通过线性拟合推导出点火延迟时间与条件因子的关系式为lg τ ig = 11.78 1000 / T c - 0.26 P c - 0.83 φ - 9.41。该表达式可用于预测实际中 N2O-C2H4 推进剂的点火延迟时间。此外，通过三个动力学模型计算出的点火延迟时间与实验数据进行了比较。结果表明，这些模型可以很好地预测高温状态下的点火行为，但在低温状态下失效。通过温度敏感性分析，在高温状态下，N2O分解反应的敏感性系数最高，并在整个反应中占主导地位。而在低温状态下，N2O 和碳氢化合物的氧化反应成为更重要的步骤。为了更好地预测低温点火行为，N2O 和碳氢化合物的低温氧化机制需要进一步发展，高敏感反应的动力学参数需要改进。