【摘要】 对脉冲爆震发动机模型机在不同爆震频率下的噪声辐射特性进行研究。通过试验测量和数据处理,发现其噪声辐射呈现间歇性和周期性的特点,主要由单极子源和四极子源组成;噪声辐射的频谱为宽频带谱,其能量主要集中在低频部分(0~5 000 H z),由气流脉动的基频(即爆震频率)和谐频组成;峰值声压级与爆震频率无关,脉冲声压级、声功率级、声功率随爆震频率的提高而提高。更多还原

【Abstract】 The noise radiation characteristics of a pulse detonation engine model were investigated under several operation frequencies.By experimental measurement and data processing,it is found that the noise radiation characteristics are intermittent and periodic.Pulse detonation engine jet noise are mainly consisted of annuploe source and quardrupole source.The frequency spectrum of the noise is very broad,and it’s radiation energy is mainly concentrate in the frequency range of 0-5 kHz,composed of principal frequency(namely the detonation frequency) caused by the pulsed jet and harmonic frequencies.The peak sound level is independent of the detonation frequency.Impulse sound pressure level and sound power level and sound power increase along with the increasing of detonation frequency.更多还原