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为了探索各频率下管壁温度随时间的变化趋势及爆震管外壁面的温度分布规律,对爆震室内径68mm,长2 000mm,以汽油为燃料、空气为氧化剂的吸气式脉冲爆震发动机进行试验,用热成像仪对稳定工作在10Hz,20Hz,40Hz下的管壁温度进行了监测。结果表明:同一频率下随时间的增加壁面温度增加速度减小;热平衡时壁面温度随频率的增加而增长,10Hz,20Hz,40Hz热平衡时外壁面最高温度分别在726℃,1011.5℃,1159.5℃以上;热平衡前管壁温度的增长速度随频率的增加而增加,管壁温度的增长速度跟频率约成正比;爆震室上沿着压缩波叠加至形成爆震的方向,温度在外壁面上递增分布,在爆震形成区温度最高,从爆震形成区到发动机出口处,温度在外壁面上逐渐降低;各频率下最高温度区位置基本不变,距点火位置1 350mm左右;同一轴向位置上的外壁面温度随频率的增加而增加,温度的增长幅度随频率的增加而减小。
In order to explore the trend of tube wall temperature with time and the temperature distribution of the outer wall of the detonation tube at various frequencies, the pulse-to-pulse detonation with an inner diameter of 68mm and a length of 2000mm on the detonation chamber with air as the oxidant The engine was tested using a thermal imager to monitor tube wall temperature for stable operation at 10 Hz, 20 Hz, 40 Hz. The results show that the increase of wall temperature decreases with the increase of time at the same frequency. The wall temperature increases with the increase of frequency at the same frequency. The maximum temperature of the outer wall at 10Hz, 20Hz and 40Hz heat balance is 726 ℃, 1011.5 ℃ and 1159.5 ℃ respectively ; The growth rate of tube wall temperature increases with the increase of frequency before thermal equilibrium, and the growth rate of tube wall temperature is approximately proportional to the frequency; the detonation chamber is superposed with the compressional wave to form the direction of detonation, and the temperature is distributed on the outer wall , The highest temperature in the detonation zone, from the detonation zone to the engine exit, the temperature gradually decreased on the outer wall surface; the maximum temperature zone at each frequency is basically the same position, from the ignition position about 1 350mm; the same axial position The temperature of outer wall increased with the increase of frequency, and the increase of temperature decreased with the increase of frequency.