往复式热循环多孔介质燃烧系统压力波动特性

Pressure Dynamic Distribution in Reciprocal Porous Media Combustion System with Heat Recirculation

对一种新型往复式热循环多孔介质燃烧系统压力动态特性进行了冷态试验研究,包括换向半周期、空截面流速、二次风比以及多孔介质结构参数对系统内部压力波动特性的变化规律.结果表明,随系统周期性的运行,系统内部各点压力动态分布呈现周期性拟矩形波变化;系统存在一个最小换向稳定时间;压力波动幅值随空截面流速和二次风比的增加而增大;多孔介质结构参数变化(孔径)对系统压力波动影响较小。

The characteristic of dynamic pressure wave in a novel reciprocal porous media combustion system with heat recirculation was studied experimentally. The effects of half-cycle, superficial velocities, secondary air ratio and porous medium structure on pressure dynamic distribution were investigated. The results show that the superficial velocities and secondary air ratio had greater influence on the pressure dynamic profiles than the half-cycle and structure factors. It was found that the dynamic pressure in the recirculation system periodically varied with rectangle waves when the system was operated steadily and periodically. These findings provide a good reference for the design, operation of the reciprocal porous media combustion system with heat recirculation.