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利用基于多循环吸气式脉冲爆震发动机的实验获得了沿爆震室轴向9个位置的实时压力数据,经过对数据进行时域和频域的分析处理后,利用MATLAB软件的GRIDDATA函数拟合出了6个工作频率下某个循环时爆震室内压力随轴向位置及时间变化的三维图形。通过对拟合后的数据从不同角度进行分析,发现采用爆燃向爆震转捩(DDT)方式起爆会在爆震波形成前生成一个局部爆轰区、爆震波形成后平均速度维持在1000m/s左右,且峰值压力升高、随机性增大。该实验的研究结果为爆震室的结构强度研究提供了依据。
The real-time pressure data along the axial direction of the detonation chamber was obtained by experiments based on multi-cycle aspirated pulse detonation engine. After analyzing the data in time domain and frequency domain, the GRIDDATA function of MATLAB software was used to simulate the real- The three-dimensional graph of detonation chamber pressure with axial position and time at a certain cycle under six operating frequencies was obtained. By analyzing the fitted data from different angles, it is found that detonation to knock detonation (DDT) detonation will produce a local detonation zone before the detonation wave is formed. The average velocity of the detonation wave after formation is maintained at 1000 m / s Or so, and the peak pressure increases, the randomness increases. The experimental results provide the basis for the study of structural strength of detonation chamber.