甲烷/氧化亚氮绿色推进剂自着火特性实验及动力学  

Experimental and kinetic studies for the ignition characteristic of the green propellant of methane/nitrous oxide

作　　者：杨猛 丁晓倩 余涛 刘畅[1] 汤成龙[1] 黄佐华[1] YANG Meng;DING Xiaoqian;YU Tao;LIU Chang;TANG Chenglong;HUANG Zuohua(College of Energy and Power Engineering,Xi’an Jiaotong University,Xi’an 710049,Shaanxi,China;Engineering Workshop,Xi’an Jiaotong University,Xi’an 710049,Shaanxi,China)

机构地区：[1]西安交通大学能源与动力工程学院,陕西西安710049 [2]西安交通大学工程坊,陕西西安710049

出　　处：《化工学报》2025年第3期1221-1229,共9页CIESC Journal

基　　金：国家自然科学基金项目(52306161,52236001);中国博士后基金项目(BX20220250,2022M722520)。

摘　　要：利用加热的快速压缩机研究了氩气稀释下甲烷/氧化亚氮(CH_(4)/N_(2)O/Ar)推进剂的自着火特性,使用压力传感器和光信号采集系统同步获得了推进剂自着火过程压力及光信号强度;实验观察到了区分着火和不着火现象的临界着火条件,使用着火延迟期对推进剂的反应活性进行了分析;利用动力学模型对CH_(4)/N_(2)O/Ar在中低温下的着火微观反应过程进行模拟和分析。结果表明:CH_(4)/N_(2)O/Ar混合气临界着火温度随着压力和推进剂浓度的增加而降低;CH_(4)/N_(2)O/Ar混合气的着火延迟期随着温度及压力的增加而缩短。杨模型能够在全温度压力范围内对混合气的着火延迟期进行较好的预测。其着火过程中CH_(4)主要通过H提取反应消耗,而N_(2)O主要通过分解反应及N_(2)O+H=====N_(2)+OH反应消耗。Nitrous oxide and fuel blend(NOFBX)has been considered as potential hydrazine replacement due to their advantages of non-toxic,high-performance,and low-cost as monopropellant.The methane and nitrous oxide(CH_(4)/N_(2)O),a typical NOFBX combination,provides significant benefits for meeting propulsion performances and has become a focus of increased research in recent years.In addition,N_(2)O and CH_(4)can be stored in one premixed tank,which would increase the risk of ignition of premixed fuel and oxidizer at high self-pressurized condition.However,limited data has been published on the ignition safety and ignition delay time(IDT)of CH_(4)/N_(2)O at high pressure,resulting in unclear understanding of the ignition hazards and mechanisms.In this work,the ignition behaviors of Ar diluted CH_(4)/N_(2)O were experimentally investigated firstly in a heated rapid compression machine(RCM)by detecting the pressure and light emission traces at temperatures and pressures ranging from 1125—1450 K and 10—40 bar.The critical ignition temperature which separates the non-ignition and ignition cases was determined.The results show that the critical ignition temperature decreases with the increases of pressure and fuel/oxidizer concentration.For the successful ignition cases,the ignition delay times were measured and used to validate several recently developed kinetic mechanisms.The results show that the IDT predictions from Yang model have good agreement with the measured IDTs.During the ignition process,CH_(4)is mainly consumed by H extraction reaction,while N_(2)O is mainly consumed by decomposition reaction and reaction N_(2)O+H=====N_(2)+OH.

关 键 词：氧化亚氮 碳氢化合物 快速压缩机 临界着火条件 着火延迟期 反应动力学 

分 类 号：V11[航空宇航科学与技术—人机与环境工程]