FOX‑7/NC/NG在快速热刺激下的自着火行为

In this work, the auto‑ignition behaviors of FOX‑7/NC/NG powder were investigated by using rapid compression machine (RCM) under a high temperature environment. High speed images and pressure evolutions were used to record the responses 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 1.2×10⁴ K·s^-1. With the temperature increasing to 913.1 K (the heating rate is about 2.5×10⁴ 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 (IDT_I) 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.