FOX⁃7/NC/NG在快速热刺激下的自着火行为

Auto⁃ignition Behaviors of FOX⁃7/NC/NG Under a Rapid Thermal Stimulus

在快速压缩机实验平台中利用高速成像及动态压力采集手段研究了FOX⁃7/NC/NG快速热刺激下的自着火行为。结果表明样品在快速压缩机上止点热力条件为3.0 MPa,598.1 K,环境平均热加载速率约为1.2×10^(4) K·s^(-1)时,未发生自着火;保持压力不变,提高温度至913.1 K,平均热加载速率升高至2.5×10^(4) K·s^(-1)时,样品发生自着火。对样品在3.0 MPa,913 K下的自着火过程进行多次重复实验,发现其着火延迟时间(IDTI)误差小于20%,燃烧持续期误差小于5%;FOX⁃7/NC/NG样品在不同热加载速率下的实验表明,热加载速率越高,自着火越快,燃烧持续期越短。

In this work,the auto⁃ignition behaviors of FOX⁃7/NC/NG powder were investigated by using rapid compression ma⁃chine(RCM)under a high temperature environment.High speed images and pressure evolutions were used to record the re⁃sponses of FOX⁃7/NC/NG samples under high temperature and pressure conditions.Results show that the samples were not able to ignite at 3.0 MPa and 598.1 K,with the heating rate of about 1.2×10^(4) K·s^(-1).With the temperature increasing to 913.1 K(the heating rate is about 2.5×10^(4) K·s^(-1)),the auto⁃ignition was observed.In addition,the validated tests of FOX⁃7/NC/NG samples were conducted.Results show that the experiment has a good repeatability.The uncertainties of ignition delay times(IDTI)and burning duration are less than 20%and 5%,respectively.Lastly,the auto⁃ignition behaviors of FOX⁃7/NC/NG samples were studied at different thermal loading rates.It was found that the higher thermal loading rate,the faster ignition and the shorter burning duration.