2相多循环脉冲爆震发动机燃烧噪声辐射特性试验研究

对内径为60 mm的2相多循环脉冲爆震发动机燃烧噪声辐射特性,在其测量位置处和一定试验频率范围内进行了试验研究。经研究发现:在一定低频范围内,噪声辐射频谱由气流脉冲的基频(即爆震频率)和谐频组成;脉冲噪声是1个或多个持续时间小于1s的猝发声组成的噪声;距离发动机喷口方向越近,噪声的声压级越强;反之,噪声衰减的速度越快。

Experimental Investigation on Combustion Engine Noise Radiation Characteristics for Two-Phase Multi-Cycle Pulse Detonation

The combustion noise radiation characteristics of two-phase multi-cycle pulse detonation engine with the inner diameter 60 mm were experimentally investigated under several operating frequencies at measure location.It is found that the combustion noise radiation frequency spectrum of the engine are composed of harmony frequency and base frequency（It is detonation frequency）by the air stream air at some low frequency range.The impulse noise is constituted of the burst noise of duration one or more less than 1s.The colser the engine spout,the stronger the sound pressure level of the noise.The farther the engine spout,The faster the attenuation speed of the noise.