伴随I型边缘局域模（ELM）的高约束模（H模）具备良好的粒子和能量约束，是国际热核聚变实验堆（ITER）的基本运行方案。近年来，国际国内托卡马克装置上开展了大量弹丸缓解ELM 的实验探索，以解决将来ITER装置上ELM释放能量超过偏滤器负载的问题。实验已经证实，通过重复注入弹丸可以触发高频ELM，从而降低ELM导致的粒子和能量损失。本项目基于已有实验现象拟建立一个描述弹丸触发ELM的自洽模型，描述以下物理过程：热电子轰击固体弹丸导致弹丸消融、弹丸云膨胀与电离、剥离气球模湍流触发ELM崩塌等。在BOUT++代码体系下开发相应模块并开展弹丸触发ELM的模拟，通过跟踪等离子体的温度、密度、电流等参数扰动演化过程，揭示弹丸消融在ELM非线性崩塌过程中的作用，结合HL-2A装置的实验探讨弹丸注入深度、弹丸尺寸等参数对剥离气球模增长率以及ELM崩塌的影响。研究结果有助于控制ITER装置上的ELM崩塌。

The international thermonuclear experimental reactor (ITER) will be operated at H-mode with type I edge localized mode (ELM) due to the good energy and particle confinement. In recent years, many ELM mitigation experiments on the tokamaks around the world are implemented aiming at solving problem that the energy loss during ELM crash in ITER is too large for the diverter to take. The experiment results show that the energy loss of single ELM crash can be reduced by high repetition rate pellet injection. Therefore, it is necessary to develop a self consistent model of ELM crash triggered by pellet injection, and this model would include many physics processes, such as: the ablation of solid pellet due to thermal electron heat-flux, the expansion and ionization of the pellet ablation cloud, the ELM crash triggered by peeling-ballooning (PB) mode turbulence and so on. The module describing ELM triggered by pellet injection will be constructed using BOUT++ code. During the simulation of ELM triggered by pellet injection, the perturbation of plasma parameters, such as density, temperature, current density and so on, will be monitored to revel the role of pellet ablation in this process, and the affection of the pellet size, depth of injection and other pellet parameters on the PB mode growth rate and ELM crash will be discussed together with the experiment results on HL-2A. The research results will be useful with regard to controlling the ELM crash on ITER.