Multidimensional unsteady numerical simulations were carried out to explore the influence of thermal radiation on the propagation and structure of layered coal dust explosions. The simulation solved the reactive compressible Navier-Stokes equations coupled to an Eulerian kinetic-theory-based granular multiphase model. The radiation heat transfer is modeled by solving the radiation transfer equation using the third-order filtered spherical harmonics approximation. The radiation was assumed to be gray and all boundaries of the domain are black at 300 K. The reaction mechanism is based on global irreversible reactions for each physical process including devolatilization, char burning, moisture vaporization, and methane combustion. The governing equations were solved using a high-order Godunov method. Several simulation configurations were considered: layer volume fractions of 47% and 1%, channel lengths of 10 m and 40 m, and radiative and non-radiative cases. The results show that gray radiation has a significant influence on the propagation and structure of a layered dust explosion. However, radiation can have opposite effects on different scenarios. For example, radiation promotes the propagation of the dust flame when the layer volume fraction was 1% and in the short-channel cases where reflected shock-flame interactions are important. However, radiation enhances quenching for the 47% volume fraction dust layer in the longer channel.

进行了多维非稳态数值模拟，以探讨热辐射对层状粉尘爆炸传播和结构的影响。该仿真解决了反应性可压缩的Navier-Stokes方程，并耦合了基于欧拉动力学理论的颗粒多相模型。通过使用三阶滤波球谐函数近似求解辐射传递方程来对辐射传热建模。假定辐射为灰色，并且在300 K时，畴的所有边界均为黑色。反应机理是基于每个物理过程的整体不可逆反应，包括脱挥发分，焦炭燃烧，湿气蒸发和甲烷燃烧。控制方程使用高阶Godunov方法求解。考虑了几种模拟配置：层体积分数分别为47％和1％，通道长度为10 m和40 m，以及辐射和非辐射情况。结果表明，灰色辐射对粉尘分层爆炸的传播和结构有重大影响。但是，辐射可能对不同的情况产生相反的影响。例如，当层体积分数为1％时，辐射会促进粉尘火焰的传播，而在短通道情况下，反射的冲击-火焰相互作用非常重要。但是，对于较长通道中47％体积分数的粉尘层，辐射增强了淬灭作用。辐射在不同情况下可能产生相反的影响。例如，当层体积分数为1％时，辐射会促进粉尘火焰的传播，而在短通道情况下，反射的冲击-火焰相互作用非常重要。但是，对于较长通道中47％体积分数的粉尘层，辐射增强了淬灭作用。辐射在不同情况下可能产生相反的影响。例如，当层的体积分数为1％时，辐射会促进粉尘火焰的传播；在短通道情况下，反射的冲击-火焰相互作用非常重要。但是，对于较长通道中47％体积分数的粉尘层，辐射增强了淬灭作用。