航煤裂解气低温自点火特性与等离子体助燃研究

Investigation of Low-Temperature Auto-Ignition Chararcteristics of Cracked Gas of Aviation Kerosene and Plasma-Assisted Ignition

关键词:  航空煤油  裂解  快速压缩机  点火  等离子体  活性粒子

Key words:  Aviation kerosene  Crack  Rapid compressor  Ignition  Plasma  Active particles

摘要:

为获得燃料低温自点火特性以及等离子体对燃料点火的促进作用，基于快速压缩机实验系统，研究了52%He稀释、当量比1.0、压力3.4MPa、温度877.7~915.9K条件下，航煤裂解气（29.4%CH₄/30.8%C₂H₆/21.3%C₂H₄/18.5%C₃H₆）的自点火特性，并获得其点火延迟时间。在此基础上，采用放电与化学反应动力学解耦方法，研究了非平衡等离子体对航煤裂解气点火的促进作用。结果表明：随着初始温度从877.7K升高至915.9K，裂解气点火延迟时间从65.5ms缩短至8.1ms，且实验测量结果与修正后的USC-II机理预测结果基本一致。同时研究得出：在不同温度下，等离子体放电对裂解气点火有不同程度的促进作用，在低温下促进效果更加明显。

Abstract:

In order to obtain the low-temperature auto-ignition characteristics of fuel and the promotion effect of the plasma-assisted ignition， based on the rapid compression machine system in the paper， the auto-ignition characteristics of cracked gas of aviation kerosene（29.4%CH₄/30.8%C₂H₆/21.3%C₂H₄/18.5%C₃H₆）are experimentally investigated at equivalence ratio 1.0， pressure 3.4MPa and temperature range 877.7~915.9K，and the ignition delay times are obtained.Furthermore， by decoupling of discharge and chemical kinetics， the promotion of non-equilibrium plasma on the cacked gas ignition is studied. The results show that with the increasing of initial temperature from 877.7 to 915.9K， the ignition delay times of cracked gas are shortened from 65.5ms to 8.1ms. And the measured results are basically consistent with the predicted results by revised USC-II mechanism.At the same time， the study shows that the plasma discharge has different degrees of promoting effect on the self-ignition of cracked gas at different temperatures， and the promoting effect is more obvious at low temperature.