Based on the one-step chemical reaction Euler equations, the high resolution hybrid Roe/ HLL scheme and the adaptive mesh refinement (AMR) method were employed to numerically investigate the process of detonation induced by the collision of the diffracted shock waves inside a square tube with a cube mounted at the axis. And the effects of the tube blockage ratios were discussed on the detonation formation. Numerical results show that when the weak shock waves pass around the square obstruct, both the up and down weak shock wave diffractions occur, and they collide with each other behind the obstruct after a period of expansion, a high pressure and temperature point can be generated during the collision, which can ignite the combustible gases and accelerate the formation of detonation. However, with a large blockage ratio, as the shock wave is too weak during the collision, the detonation cannot be initiated.%基于单步化学反应的Euler方程和对激波(爆轰波)、接触间断具有良好捕捉效果的Roe/HLL混合格式以及自适应网格技术,模拟了激波在方形管中与方块障碍物相互作用,并发生绕射碰撞来诱导爆轰的过程.结果表明,弱激波在绕经方块时,形成上、下绕射激波并在方块尾部发生碰撞,生成局部高温高压点,可加快爆轰的形成；而当管内阻塞比超过一定值时,由于碰撞激波太弱则不能触发爆轰.
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