Gaseous detonation propagation of 2H2/O2/Ar mixture in an annular tube was experimentally and numerically investigated. Detonation cellular patterns were recorded by smoked foils. The second-order additive semi-implicit Runge-Kutta (ASIRK) method and the fifth-order weighted essentially non-oscillatory (WENO) scheme were used to discretize the time term and the spatial derivatives, respectively. A detailed chemical reaction mechanism model was applied to describe the processes of detonation chemical reactions. Numerical cellular patterns and detonation flow field were obtained. Experimental and numerical results show that while detonation propagates in the annular tube, due to the convergence of the outer wall and the divergence of the inner wall, the detonation intensity along the inner wall is lower than that along the outer wall, and the cell size is much larger. The distribution region of OH along the inner wall is also wider than that along the outer wall, and the concentration is smaller. Just because of the character of a rotating detonation, the detonation waves can rotate around an axis at a steady angular velocity.%对爆轰波在环形圆管(预混气体为2H2/02/Ar)内的传播分别进行了实验和数值研究.实验研究采用烟迹板记录了环形圆管内爆轰波的胞格结构.数值计算利用二阶附加半隐的Runge-Kutta法和五阶WENO格式分别离散欧拉方程的时间和空间导数项,采用基元反应简化模型描述化学反应过程,得到了旋转爆轰的流场及数值胞格结构.实验和数值模拟结果表明:爆轰波在圆环管中传播时,由于圆环的内壁发散、外壁收敛,圆环内侧爆轰强度小于外侧,胞格尺寸较大；内侧OH的分布区域大于外侧,浓度较低.旋转爆轰的这种性质,使爆轰波能以稳定的角速度绕轴旋转.
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