【摘要】 本文研究了喷口上游气流受到扰动后对喷注噪声产生的影响。通过实验证明这种影响主要是上游湍流噪声辐射到喷口外部而产生的,并且观察到上下游之间存在微弱的非线性相互作用。在这个基础上进一步考察了小孔消声器对上游噪声的抑制作用,提出小孔消声器对这一部分噪声消声量的经验公式。更多还原

【Abstract】 In the paper, the effect of upstream disturbance on jet noise is studied. By the experiments, It is found that the effect is mainly due to the upstream noise radiated through the nozzle exit. The weak nonlinear interaction between upstream noise and downstream turbulence is supposed. An empirical formula about the "excess noise" reduced by the micropore muffler is set up, according to experiments.更多还原