基于单步与多步 H₂/Air 机理的爆震波模拟网格尺度研究

In order to efficiently simplify the process of mechanism selection and resolution studies for detonation propulsion simulation，a series of detonation wave propagation simulations were conducted in a field with an aspect ratio of 20 using both the single-step and the multi-step H₂/Air mechanisms，all 7 sizes of grid were considered，including 0.5，0.4，0.2，0.1，0.08，0.04，0.02 mm. The cellular structure and the characteristic parameters of a detonation wave were obtained. The study showed that the cellular structure can be obtained when the grid size was smaller than a critical one， which was 0.1 mm and 0.4 mm for the single-step and multi-step mechanism，respectively. And the cellular structure was easier to be obtained when utilizing a smaller grid size. It was found that the averaged cell width was proportional to the grid size. Larger size of grid can enlarge the static pressure and temperature near the detonation peak，while the pressure plateau was weakly affected by both grid size and mechanism. Compared with the multi-step mechanism，the shorter ignition delay characteristics of the single-step mechanism contributed to a more clear edge of cellular structure，making it easier to obtain the self-sustained propagation of detonation wave.