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为研究RB‑2X（2，4‑二硝基苯甲醚（DNAN）/奥克托今（HMX）/铝（Al）/黏结剂）和RM‑2X（DNAN/HMX/3‑硝基‑1，2，4‑三唑‑5‑酮（NTO）/Al/黏结剂）两种新型DNAN基含铝炸药热响应特性，开展RB‑2X炸药在1.0 K·min-1、RM‑2X炸药在1.0 K·min-1和0.5 K·min-1加热速率下烤燃实验，测量炸药中心温度变化。建立烤燃弹数值模拟计算模型，采用多组元网格单元计算方法，考虑熔铸炸药冷却收缩形成空气间隙的影响，分析炸药热响应特性。数值模拟点火时间与实验结果对比显示，RB‑2X炸药点火时间偏差为1.13%，RM‑2X炸药点火时间最大偏差为5.63%。在此基础上，分析熔铸炸药壳体壁面与炸药之间的空气间隙对炸药点火时间的影响，结果显示延迟时间随间隙宽度增大而缓慢增大，当空气间隙扩大到0.75 mm后，延迟时间稳定在90 s，表明空气间隙对炸药点火时间的影响明显。预测装填RM‑2X大尺寸弹药热响应过程，结果表明弹药尺寸和加热速率的增大会明显降低点火时中心温度，DNAN熔化状态从全部熔化变为固液共存。“,”To study the thermal response of two new DNAN‑based aluminized explosives RB‑2X（DNAN/HMX/Al/binder） and RM‑2X（DNAN/HMX/NTO/Al/binder）， small‑scale cook‑off experiments and simulations of RB‑2X at a heating rate of 1.0 K·min-1 and RB‑2X at heating rates of 1.0 K·min-1 and 0.5 K·min-1 were conducted. The numerical simulation used multi‑component grid cell calculation method and considered the air gap formed by cooling and contraction of fused cast explosive. The thermal response of explosives were analyzed. The comparisons of ignition time between simulation and experiment show that the ignition time deviation of RB‑2X explosive is 1.13%， and the maximum deviation of RM‑2X explosive is 5.63%. The influence of the air gap between the explosive and the inner wall of the bomb on ignition time was also analyzed. The results show that the delay time increases gradually with the increase of gap width， and when the air gap expands to 0.75 mm， the delay time is stable at 90 s， indicating that the air gap has a significant influence on the explosive ignition time. The thermal response of large‑scale cook‑off bomb with RM‑2X explosive was predicted. The results show that the temperature at center point can be significantly reduced at ignition by increasing of ammunition size and heating rate. The state of DNAN changes from total melting to solid‑liquid coexistence.