Direct connected experimental research on hydrocarbon-fueled rotating detonation
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摘要: 以乙烯和常温煤油为燃料开展了旋转爆震直连试验，模拟飞行马赫数5.0，隔离段入口马赫数2.5，采用起爆管进行起爆。研究结果表明，乙烯当量比在0.43～0.99范围内，旋转爆震波均可稳定自持传播，传播频率为5.32～6.42 kHz，传播周期为0.157～0.188 ms。高频压力和壁面压力测量结果表明：旋转爆震波传播频率和燃烧室压力均随当量比增大而线性升高；爆震波高频压力平均峰值随当量比增大先升高后降低；隔离段出口压力随当量比增大逐渐升高，但隔离段入口气流始终未受影响，马赫数保持为2.5。常温煤油当量比为0.70时，也实现了旋转爆震波的稳定传播。Abstract: Direct connected tests of rotating detonation were performed with ethylene and room-temperature kerosene adopted as fuel. The corresponding flight Mach number is 5.0, and the Mach number is 2.5 at the isolator entrance. Results show that the rotating detonation wave was sustained after initiation with the equivalent ratio of ethylene ranging from 0.43 to 0.99. The propagation frequency of detonation waves is 5.32–6.42 kHz, with a propagation cycle of 0.156–0.188 ms. As the equivalent ratio increases, the propagation velocity of the detonation wave and the pressure in the detonation combustor increase almost linearly. While the averaged pressure peaks of the dynamic pressure（PCB pressure sensor） first increase and then decrease. The pressure at the isolator exit also increases under a higher equivalent ratio, but the velocity remains unchanged at Ma=2.5. When the equivalent ratio of kerosene was about 0.70, the rotating detonation wave was also sustained.
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Key words:
- rotating detonation /
- ramjet /
- hydrocarbon fuel /
- isolator
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图 2 加热器室压与总温测量结果
Figure 2. Measured results of total pressure and total temperature of air heater
图 6 4#试验旋转爆震波传播频率
Figure 6. Rotating detonation propagation frequency results of test 4#
图 7 不同当量比下的旋转爆震波传播主频及燃烧室和隔离段压力
Figure 7. Rotating detonation propagation frequency，and pressure in the combustor and isolator under different equivalent ratios
图 8 不同当量比下的爆震波高频压力平均峰值
Figure 8. Averaged detonation wave pressure peaks under different equivalent ratios
图 9 隔离段和燃烧室沿程压力计算结果与试验结果对比
Figure 9. Comparison of computational and experimental results of pressure distribution in the isolator and combustor
表 1 试验工况
Table 1. Experiment condition
No. Ф $\overline f $/kHz Fuel 1# 0.43 5.32 C2H4 2# 0.51 5.61 C2H4 3# 0.64 5.98 C2H4 4# 0.72 6.07 C2H4 5# 0.87 6.11 C2H4 6# 0.92 6.42 C2H4 7# 0.99 6.36 C2H4 8# 0.70 3.97 Kerosene 
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