为了预估带壳炸药在有限水域内的爆炸能量输出特性，采用物理试验、仿真模拟相结合的手段开展PBX-2炸药在水中爆炸数值模拟。首先利用Φ50 mm圆筒试验确定了PBX-2炸药的爆轰产物JWL状态方程（Jones-Wilkins-Lee equation of state）参数，并在ANSYS AUTODYN程序内建立了相应的计算模型，该模型考虑了静水压力梯度和包括自由面、侧壁和水底在内的边界条件。对带壳炸药在Φ12 m×9.5 m爆炸水池内的水中爆炸过程进行了数值模拟，获取冲击波峰值压力、冲击波能和气泡脉动周期等重要参数。结果表明，入射冲击波的峰值压力、比冲击波能的计算值与试验值最大误差值分别为6.5%、2.1%，仿真结果与试验结果基本吻合。因此，基于圆筒试验获取JWL状态方程参数创建的仿真模型可以准确预估带壳炸药在有限水域中的爆炸参数，该方法对于水中兵器用炸药的能量设计具有应用价值。

In order to study the energy output character of shelled explosive in confined water area, a combination of physical experiments and simulation modeling was used to carry out numerical simulation of the underwater explosion of PBX-2explosive. First, aΦ50 mm cylinder test was used to obtain the JWL(Jones-Wilkins-Lee) equation of state parameters of the explosive PBX-2. Then a numerical model was constructed in commercial software ANSYS AUTODYN, which considers the hydrostatic pressure gradient and boundary conditions including free surface, side wall and water bottom were all considered. Underwater explosion of PBX-2 explosive in water pool of Φ12 m × 9.5 m were calculated by using the model above, and also the underwater explosion test was done. The results show that the error between the simulation results and empirical formula of shock wave peak pressure, shock wave energy are less than 6.5% and 2.1%. Therefore, the simulation results are almost in accordance with the empirical results, and the relative error can meet the practical requirement. So the simulation model based on the parameters of JWL equation of state obtained by cylinder test can accurately predict the explosion parameters of shell explosive in limited water, which is valuable for the explosive energy design of underwater weapon.