Annular gaps width effecting on performance of rotating detonation engine
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摘要: 为研究环缝宽度对旋转爆震发动机（rotating detonation engine, RDE）工作特性的影响，在非预混RDE中进行实验，同时采用高频压力传感器、离子探针和高速摄影等测量设备，在同一入口质量流率的条件下，改变空气进气环缝宽度和燃烧室环缝宽度。获得了单波、双波、四波对撞及混合传播模态；当燃烧室环缝宽6 mm时，增加空气进气环缝宽度，爆震波由四波对撞转变为同向双波，最终以单波形式传播；而燃烧室环缝宽10或15 mm时，空气进气环缝宽度对爆震波传播模态的影响较小；此外，四波对撞模态下，爆震波压力峰值和离子信号峰值低于单波和双波模态时的值。Abstract: In order to investigate the propagation mode of rotating detonation wave in rotating detonation engine (RDE) with different annular gap width, the experiment was conducted on non-premixed RDE. During the experiment, high-frequency pressure transducers, ion probes and high-speed photography were used simultaneously. Under the condition of the same inlet mass flow rate, the annular gap width of air inlet and detonation chamber were changed. As a result, the propagation mode including the single wave, double wave, four wave collision and mixed mode were obtained. By analyzing the experimental results, it was found that when the detonation chamber width was 6 mm, the detonation wave was changed from four wave collision to double wave, and finally to the single wave as the air inlet width was increased. When the detonation chamber width were 10 and 15 mm, the air inlet width had little influence on detonation wave propagation mode. In addition, under the four wave collision mode, both of the pressure peak and ion signal peak were lower than that of the single wave and double wave modes.
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图 3 单波、双波、四波对撞模态示意图
Figure 3. The diagram of single wave (SW), double wave (DW) and four wave collision (FWC)
表 1 实验参数及结果
Table 1. Experimental parameters and results
工况 δ/mm w/mm Φ/(g·s−1·mm−2) p(H2)/MPa p(air)/MPa 传播状态 fd/Hz pc/MPa 1 1.0 6 0.118 1.010 0.498 四波对撞 4 699 0.056 2 1.5 6 0.118 1.010 0.234 同向双波 5 057 0.058 3 2.0 6 0.118 1.010 0.111 单波 2 989 0.047 4 1.0 10 0.072 1.010 0.368 同向双波/对撞 4 829/3 671 0.027 5 1.5 10 0.072 1.034 0.185 单双波交替/对撞 3 427/4 477 0.036 6 2.0 10 0.072 1.010 0.094 单双波交替/对撞 3 319/4 373 0.033 7 1.0 15 0.049 1.010 0.366 四波对撞 4 658 0.020 8 1.5 15 0.049 1.010 0.156 四波对撞 4 518 0.016 9 2.0 15 0.049 1.010 0.073 四波对撞 4 580 0.024 
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