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为探索不同填充系数下气液两相脉冲爆轰发动机爆轰噪声特点,搭建了能够准确调节气液两相脉冲爆轰发动机填充系数的噪声测试实验系统,对800 mm和3000 mm处不同角度下脉冲爆轰发动机爆轰噪声特性进行了研究。结果表明,随着填充系数的增加,冲击噪声幅值与射流噪声幅值随之增大,但射流噪声幅值与冲击噪声幅值的比值降低;在爆燃与爆轰的转折点,冲击噪声幅值与射流噪声幅值显著增加;爆燃阶段下的冲击噪声幅值与射流噪声幅值增加速率小于爆轰阶段;随着距离的增加,填充系数对冲击噪声与射流噪声的增强作用有所减弱,冲击噪声的衰减速度快于射流噪声;随着填充系数的增加,当距离较小时指向性明显,当距离较大时指向性不明显。
In order to explore the characteristics of detonation noise of gas-liquid two-phase pulse detonation engine with different filling factors, a noise test experimental system capable of accurately adjusting the filling factor of a gas-liquid two-phase pulse detonation engine was built. For different angles of 800 mm and 3000 mm The detonation noise characteristics of pulse detonation engine were studied. The results show that the impact noise amplitude and the jet noise amplitude increase with the increase of the filling factor, but the ratio of the jet noise amplitude and the impact noise amplitude decreases. At the turning point of the deflagration and detonation, the impact noise amplitude And the amplitude of jet noise increased significantly. The amplitude of impulsive noise and the increase of jet noise amplitude in deflagration stage were less than those in detonation stage. With the increase of distance, the filling coefficient had less effect on the enhancement of impulse noise and jet noise, The decay speed of noise is faster than that of jet noise. With the increase of filling factor, the directivity is obvious when the distance is small, and the directivity is not obvious when the distance is large.