Semi-valveless pulse detonation cycle at a kilohertz-scale operating frequency
Semi-valveless pulse detonation cycle at a kilohertz-scale operating frequency
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DOI：
10.1016/j.combustflame.2019.04.035
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发表时间：
2019-07
影响因子：
4.4
通讯作者：
K. Matsuoka;H. Taki;A. Kawasaki;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;H. Taki;A. Kawasaki;J. Kasahara;H. Watanabe;A. Matsuo;T. Endo
脉冲爆震发动机需要高的工作频率以增加推力-发动机重量比或推力密度。Matsuoka等人（2017）提出的半无阀脉冲爆震循环（PDC）可以实现超过几千赫兹的高工作频率。为了实现接近气体动力学上限的更高工作频率，有必要尽量减少施加缓冲层的过程，以避免可引爆混合物的自燃。进行了实验，并开发了一个一维的数值模型，以调查的缓冲层的最小厚度和稳定的PDC操作所需的持续时间。乙烯用作燃料，纯氧用作氧化剂。内径为10 mm的两个燃烧室的总长度为40 mm和80 mm。因此，对于稳定的PDC操作，建议缓冲层的厚度为约20 mm。该结果表明，需要一个PDC的持续时间的10%来防止自燃（SI）。在失败的PDC中，证实了早期和晚期SI。有趣的是，具有短燃烧室的高频PDC操作可以抑制后期SI，并且在相同的缓冲层厚度下导致更高的成功率。此外，一个稳定的PDC操作的1916赫兹与燃烧室的总长度为40毫米被证明。
A high operating frequency of a pulse detonation engine is required to increase the thrust-to-engine weight ratio or thrust density. The semi-valveless pulse detonation cycle (PDC) proposed by Matsuoka et al. (2017) can achieve a high operating frequency exceeding several kilohertz. For achieving a higher operating frequency close to the upper limit of gas dynamics, it is necessary to minimize the process in which the buffer layer is applied to avoid self-ignition of the detonable mixture. Experiments were conducted, and a one-dimensional numerical model was developed to investigate the minimum thickness of the buffer layer and the required duration for the stable PDC operation. Ethylene was used as a fuel and pure oxygen as an oxidizer. The total length of two combustors with an inner diameter of 10 mm was 40 and 80 mm. Therefore, the thickness of the buffer layer of approximately 20 mm was suggested for the stable PDC operation. This result indicated that 10% of the duration of one PDC was required to prevent self-ignition (SI). In the failed PDC, the early and late SI were confirmed. Interestingly, high-frequency PDC operation with a short combustor can suppress late SI and results in a higher success rate with the same thickness of the buffer layer. Furthermore, a stable PDC operation of a 1916 Hz with a combustor with a total length of 40 mm was demonstrated.