In order to investigate the effects of fuel distribution on the operation of two-phase pulse detonation engine (PDE), a series of cold flow and multicycle PDE experiments was carried out with 9 mixing schemes. Homogeneity degree with fuel distribution considered in terms of space and time was proposed to quantitatively evaluate the mixing of liquid fuel and air by particle image velocimetry (PIV) in cold flow experiments. Operation stability of multicycle PDE was presented by statistical analysis of peak pressure at the outlet of a detonation tube. The relationship between operation stability and homogeneity degree was quantitatively elaborated. These experimental results indicated that not only using mixing reinforcement devices (such as pore plate and reed valve) was fuel distribution improved but also the effect of inlet ways on the homogeneity degree was weakened. The homogeneity degree of fuel distribution was a critical value for stable working of multicycle PDE. When homogeneity degree was lower than 0.72, stable state was not maintained and detonation wave in some cycles was not established due to poor fuel distribution. Therefore, it is necessary to hold homogeneity degree larger than 0.72 to achieve stable operation of PDE. These results contribute to enhancing the operation stability and offering guidelines for the design of PDE’s mixing scheme.

中文翻译：

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两相不均匀混合脉冲爆震发动机的实验研究

为了研究燃料分配对两相脉冲爆震发动机（PDE）运行的影响，使用9种混合方案进行了一系列冷流和多循环PDE实验。提出了在空间和时间上考虑燃料分布的均匀度，以在冷流实验中通过粒子图像测速法（PIV）定量评估液体燃料和空气的混合情况。通过对爆轰管出口的峰值压力进行统计分析，得出多周期PDE的操作稳定性。定量阐述了操作稳定性与均匀度之间的关系。这些实验结果表明，不仅使用混合增强装置（例如孔板和簧片阀）改善了燃料分配，而且削弱了进气道对均匀度的影响。燃油分配均匀度对于多周期PDE的稳定工作而言，这是一个关键价值。当均匀度低于0.72时，由于燃料分配不良，不能保持稳定状态，并且在某些循环中没有建立起爆波。因此，必须保持均一度大于0.72才能实现PDE的稳定运行。这些结果有助于提高操作稳定性，并为PDE混合方案的设计提供指导。