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建立了弯尾管Helmholtz型无阀自激脉动燃烧器实验系统,研究了燃烧室内的压力振荡特性,分析了尾管结构参数、热负荷和过量空气系数对燃烧室内压力振幅的影响.结果表明:所设计的弯尾管脉动燃烧器能产生稳定的脉动燃烧,脉动压力振幅较大、频率较低,压力振荡波形接近正弦曲线;压力均值和压力振幅沿90°弯尾管展开长度方向减小,弯尾管内的压力分布与1/4波形管分布接近;燃烧室内的压力振幅随尾管弯曲角度的增大而减小,弯曲位置在尾管出口处时的压力振幅较在尾管入口处时小;在不改变燃烧器结构参数的条件下,压力振幅随热负荷和过量空气系数的增大而增大,实验结果与理论预测值定性一致.
The experimental system of Helmholtz valve-free self-excited pulsating combustor was established, the pressure oscillation in the combustion chamber was studied, and the influence of the structure parameters of the tail pipe, the heat load and the excess air ratio on the pressure amplitude in the combustion chamber was analyzed. The designed tail-pipe pulsating combustor can generate steady pulsating combustion with large amplitude and low frequency of pulsating pressure and close to sinusoidal waveform of pressure oscillation. The pressure average and pressure amplitude decrease along the length of 90 ° curved tube expansion, The pressure distribution in the tail pipe is close to that of the 1/4 corrugated pipe. The pressure amplitude in the combustion chamber decreases with the increase of the tail pipe bending angle. The pressure amplitude of the bending position at the exit of the tail pipe is higher than that at the tail pipe inlet The pressure amplitude increases with the increase of heat load and excess air coefficient without changing the structural parameters of the burner. The experimental results are qualitatively consistent with the theoretical predictions.