【摘要】 针对爆震波在无内壁约束环形通道内的传播过程，采用乙烯、氧气和氮气预混气，开展了环形通道内径(r_i)、预混气氮气稀释比对爆震波传播特性影响的数值模拟研究，获得了不同因素对爆震波传播特性的影响．结果表明，环形通道内径减小，预混气氮气稀释比升高，均会使爆震波传播稳定性下降．在环形通道内稳定传播时，爆震波会在外壁面处形成马赫反射或规则反射两种反射模式．爆震波能否在半封闭环形通道内稳定传播主要决定于环形通道内径r_i和平均胞格尺寸λ_a的比值．当无量纲内径r_i/λ_a>17.5时，爆震波在环形通道维持稳定传播；当9.5<r_i/λ_a≤17.5时，为弱不稳定模态；当r_i/λ_a≤9.5时，爆震波存在严重解耦现象，内壁面处法向传播速度小于理论C-J速度的60%，为强不稳定模态．更多还原

【Abstract】 In order to clarify the impact of channel curvature and dilution ratio on the propagation in a curved channel considering the lateral expansion on the inner side,this numerical study has been conducted utilizing a mixture of ethylene,oxygen,and nitrogen. The results indicate that either the decrease in channel curvature or the increase in dilution ratio will result in propagation instability. When the detonation wave propagates stably,two reflection modes,i.e.,Mach reflection and regular reflection,are obtained near the outer wall. Whether the detonation wave propagates stably in the semi-confined curved channel mainly depends on the ratio of the inner radius(r_i)to the average cell width λ_a. When the non-dimensional inner radius exceeds 17.5,i.e.,r_i/λ_a>17.5,the detonation wave maintains stable propagation. When 9.5<r_i/λ_a≤17.5,the detonation wave propagates in the weakly unstable mode. When r_i/λ_a≤9.5,severe decoupling of the detonation wave occurs,and the normal velocity near the inner wall is smaller than 60% of the C-J velocity,representing the highly unstable propagation mode.更多还原