新型高温空气产生系统压力波动与可行性分析

Feasibility and pressure dynamics of novel system for generating high temperature air

对一种新型往复式热循环多孔介质燃烧高温空气产生系统进行了冷态试验研究.介绍了系统的工作原理及实验流程,分析了一次风量、二次风比及多孔介质结构参数组合对系统压力波动特性、高温空气模拟气流产生的可行性和产生量的影响.结果表明,一次风量和二次风比对系统压力波动影响较大;一次风量增加有利于高温空气模拟气流产生,当二次风比大于等于1时,模拟气流产生可行,且值越大,可行性越好;一次风量和二次风比增大,高温空气模拟气流量绝对值增加,但从分流比分析,高温空气模拟气流受一次风量影响较小,随二次风比增大而逐渐减小.在空隙率相同的情况下,多孔介质孔径变化对系统压力波动、高温空气模拟气流产生和产生量影响较小.通过比较4种多孔介质结构组合,表明燃烧器内采用渐变型多孔介质燃烧器更有利于增大分流比.

A cold mode experiment was conducted to analyze the feasibility and pressure dynamics of a novel reciprocal porous media combustion system with heat recirculation for generating high temperature air. The influence of primary air, secondary air ratio, and porous media structure on the pressure dynamic and the producing characteristics of simulating high temperature air was investigated. Results show that the primary air and secondary air ratio have more influence on the pressure dynamic of the system than the diameter of porous media. When the secondary air ratio is no less than 1, the simulating high temperature air can be obtained. The increase in primary air and secondary air ratio conduces to the producing of simulating high temperature air and increases the absolute amount of simulating high temperature air. But the split ratio is little influenced by primary air and decreases with increasing of the secondary air ratio. The diameter of the porous media has little influence on the split ratio, producing of simulating high temperature air and pressure dynamics at certain porosity. The gradually-varied porous media in the combustor is benefit to increase the split ratio than the other structure combinations.