Investigation of fluid motion in valveless pulse detonation combustor with high-frequency operation
Investigation of fluid motion in valveless pulse detonation combustor with high-frequency operation
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DOI：
10.1016/j.proci.2016.07.069
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
K. Matsuoka;K. Muto;J. Kasahara;H. Watanabe;A. Matsuo;T. Endo
中科院分区：
文献类型：
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作者：
K. Matsuoka;K. Muto;J. Kasahara;H. Watanabe;A. Matsuo;T. Endo
采用氧化剂进料线内径等于燃烧室内径(内径= 10 mm)的新型无阀脉冲爆震燃烧室，研究了工作频率为500 Hz的无阀脉冲爆震燃烧室中流体的运动。气态氧以无阀模式供应给PDC。相反，超临界乙烯以垂直于PDC轴的方向注入PDC。利用安装在侧壁上的12个离子探头测量了火焰传播速度和燃烧气体的回流。在所有燃烧试验中测得的火焰传播速度为10~7 ± ，为Chapman-Jouguet爆速的4%。并将实验结果与一维数值计算结果进行了比较。在燃油喷射停止时间与点火时间相同的条件下，回流燃烧气体的轨迹与实验结果一致，在7%以内。研究发现，缩短燃烧气体回流过程对于获得更高的工作频率至关重要。
The motion of a fluid in a valveless pulse detonation combustor (PDC) at an operating frequency of 500 Hz was investigated using a novel PDC, in which the inner diameter of the oxidizer feed line was equal to that of the combustor (inner diameter = 10 mm). Gaseous oxygen was supplied to the PDC in a valveless mode. In contrast, supercritical ethylene was injected into the PDC in a direction perpendicular to its axis. The flame propagation speed and backflow of the burned gas were measured using 12 ion probes installed on the side wall. The measured flame propagation speeds in all the combustion tests were 107 ± 4% of the Chapman–Jouguet detonation speed. In addition, the experimental results were compared with those of a one-dimensional numerical calculation. Under the condition that the stop time of the fuel injection was equal to the spark time, the trajectory of the backflowing burned gas was identical to the experimental results, within 7%. Shortening the burned-gas backflow process was found to be essential to achieve a higher operating frequency.