关键词: 兵器科学与技术, 脉冲爆轰发动机, 噪声辐射, 指向性, 喷管

Abstract: As an effective approach to improve the thrust performance, the nozzle plays an important role in the control of formation and propagation of pulse detonation engine noise. The experimental system of pulse detonation engine is set up to investigate the formation and control method of detonation noise. The detonation noise characteristic of pulse detonation engine with three nozzles is studied. The results show that the convergent-divergent nozzle has the most significant influence on pulse detonation engine noise to reduce the noise amplitude by 77.13% in 0 ° direction and at 3 000 mm. Large convergence angle would lead to obvious directivity for convergent nozzles. The obvious directivity would be also obtained by divergent and convergent-divergent nozzles with small exit area. The convergent-divergent nozzle with 48 mm throat diameter and the divergent nozzles with 280 and 320 mm exit diameters have the significant impact on reference radius which is reduced from 1 600 mm to 800 mm . The results are of great significance for studying the mechanism of detonation noise and expediting the process of the engineering application.

Key words: ordnance science and technology, pulse detonation engine, noise radiation, directivity, nozzle