【摘要】 建立了湍流预混火焰实验系统并实现了驻定火焰。无条件示踪条件下的研究结果表明,火焰区的速度分布呈现 双峰分布,初步证实火焰区湍流度峰值的存在是由于火焰脉动导致速度测值分散,最终由统计得到表观湍流度的增大。条 件示踪测量结果表明,在火焰区反应物来流的湍流度与上游的测值并没有明显的变化,进一步证实了这一结论。更多还原

【Abstract】 Experimental system for study on turbulent premixed combustion was erected and stagnant flam was realized in the paper. The reacting flow field was diagnosed with Laser Doppler Anemometry (LDA). The results demonstrate that the turbulence peak at the flame zone measured with solid powder is statistical results of alternatively detected velocities of low-speed incident reactant flow and highspeed products flow, respectively. The "turbulence" peak indicates neither the turbulence of reactants nor that of products, and merely a result of statistical process.更多还原