利用一维数值模拟分析解释了神光Ⅲ原型高中子产额内爆实验中核反应速率的双峰现象。双峰现象的出现是内爆中核反应区能量竞争的结果。在核反应期间反应区离子的增能机制主要是压缩做功，能量耗散机制主要是离子-电子的库仑碰撞。冲击波在DT燃料中的来回反射，使得核反应区的压缩做功出现强弱交替。压缩做功与库仑碰撞能耗的竞争导致反应区离子内能出现上下波动，使得核反应速率出现双峰现象。实验测量的核反应速率峰值时间与数值模拟结果相一致。

The double-peak fusion rate of capsules for high yield implosion experiments on Shenguang Ⅲ prototype laser is studied by numerical simulation. The competition of energy gain and loss in the fusion region causes the double-peak phenomenon in fusion rate. During the time of fusion, the ions in fusion region obtain energy mainly due to compression, and lose energy mainly by the Coulomb collision with electrons. The shock wave moves back and forth in the DT fuel because of the reflections in the center and at the inner surface of glass, which causes the fluctuation in compression power. The competition between the compression work and Coulomb collision fluctuates the internal energy of ions, resulting in the double-peak fusion rate. The simulations of bangtime are in good agreement with experiments.