The ignition characteristic of solid propellant is the main content in internal ballisticresearch. In this study, the factors which may have an impact on ignition delay time ofNitrate Ester Plasticized Polyether Propellant (NEPE) are analyzed by a CO_2 laser radiationexperiment. Using high-speed camera, the ignition process of NEPE propellant is recordedunder different environmental conditions. Results show that the ignition delay timedecreases with the increase of laser heat flux, ambient pressure and initial temperature ofNEPE propellant. At the same time, with the increase of laser heat flux, the influences ofambient pressure and initial temperature on the ignition delay time decrease. Besides, theeffect of oxygen concentration on the ignition delay time is confirmed that the oxygencontent has little effect on the ignition delay time when the oxygen content of the ambientgas is less than that of the propellant pyrolysis product.
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