Effect of inlet temperatures on pulse detonation combustion characteristics
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摘要:
为了获得进气温度对脉冲爆震燃烧特性影响规律，结合试验和理论分析的方法，在爆震点火频率为15～25 Hz、进气温度为300～450 K条件下，对爆震管内燃烧状态、沿程峰值压力、压力波及火焰传播速度进行了研究。研究结果表明：从试验和理论分析结果来看，峰值压力与进气温度呈现反比趋势；进气温度在300 K时，整体火焰传播速度较低，在350 K和400 K最快达到
2000 m/s，但400 K无法维持2000 m/s的火焰传播速度。提高进气温度对脉冲爆震燃烧的循环起爆性能具有较大影响，具体表现为在300 K进气温度下，15、20 Hz和25 Hz都能实现稳定起爆，而进气温度提高到350 K以后，15 Hz能稳定起爆，20 Hz出现掉帧现象，而25 Hz只能进行连续燃烧。综合来看，进气温度提高，会降低爆震峰值压力，显著提高连续燃烧概率。Abstract:In order to obtain the influence of inlet temperature on the pulse detonation combustion characteristics, the combustion state, peak pressure, pressure wave and flame propagation velocity in detonation tube were studied under the conditions of detonation ignition frequency of 15—25 Hz and inlet temperature of 300—450 K by means of experimental and theoretical analysis. The results showed that: from the experimental and theoretical analysis results, the peak pressure was inversely proportional to the inlet temperature; when the inlet temperature was 300 K, the overall flame propagation velocity was low, and the fastest reached
2000 m/s at 350 K and 400 K, but the flame propagation velocity of2000 m/s cannot be maintained at 400 K. Increasing the inlet temperature had a great influence on the cyclic initiation performance of pulse detonation combustion. Specifically, at the inlet temperature of 300 K, stable initiation can be achieved under 15, 20 Hz and 25 Hz. When the inlet temperature was increased to 350 K, stable initiation can be achieved under 15 Hz, a frame drop phenomenon was observed under 20 Hz, and continuous combustion was achieved under 25 Hz. On the whole, the increase of inlet temperature could reduce the peak pressure of detonation and significantly increase the probability of continuous combustion.-
Key words:
- pulse detonation /
- inlet temperature /
- combustion state /
- peak pressure /
- flame propagation velocity
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图 6 不同进气温度下15 Hz点火频率压力时序图
Figure 6. Different inlet temperature 15 Hz ignition frequency pressure sequence diagram
表 1 主要性能参数
Table 1. Main technical parameters
参数 数值 压力测量范围/kPa 3450 灵敏度/（mV/kPa） 1.45 采样频率/kHz ≥500 反应时间/µs ≤1.0 反应频率/Hz 0.01 温度范围/K 200～408 
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表 2 试验工况
Table 2. Experimental conditions
进气温度T1/K 点火频率/Hz 300 15 350 15 400 15 450 15 300 20 350 20 300 25 350 25
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表 3 试验设备精度
Table 3. Precision of experimental equipment
测量设备 范围 精度/% 压力传感器 （压力） 0.014～ 3450 kPa±0.1 压力传感器 （时间） 0～500 kHz ±0.005 离子探针 −10～10 V ±0.005
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表 4 物理量不确定度
Table 4. Uncertainty of physical quantity
物理量 不确定度/% 压力p/MPa 1.0 火焰传播速度vf /（m/s） 0.7 火焰持续时间tfire/ms 0.7
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表 5 CJ爆震波压力
Table 5. CJ detonation wave pressure
T1/K CJ爆震波压力/MPa 300 1.95 350 1.67 400 1.46 450 1.30
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表 6 计算结果
Table 6. Calculation results
T1/K vCJ/（m/s） 式（5） CEA 300 1853 1963 350 1874 1858 400 1894 1852 450 1914 1847
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