火箭强噪声模拟装置结构对电声转换效率影响分析

The Characteristic Analysis of Electro-acoustic Efficiency of Rocket Strong Noise Simulation Device Structure

建立了火箭强噪声装置单元工作特性参数计算模型。仿真分析了单元结构中谐振小孔数量和声道扩张角变化对单元内声场特性的影响。结果表明谐振小孔对声压和电声转换效率有着重要影响。当小孔数量减少时,谐振频率降低,喉部声压增大,电声转换效率呈现先升高后降低的趋势;声道扩张角增大时,喉部声压级降低,出口质点速度变小。

The computing models of parameters characteristic of acoustic radiation section with Diversion-Cone in the rocket strong noise unit device have been created.The effects of the quantities of small holes and the expanding angle of sound track to the interior sound field of unit have been simulated.It shows that the syntonic holes play an important role to the sound pressure and electro-acoustic efficiency.With the descending of the quantities of synotonic holes,the synotonic frequency begins to decrease,the sound pressure increases and the electro-acoustic eficiency increases at first and then decreases.The throat pressures and the particle velocities decrease with the increasing of expanding angle of sound track.