The geometry of a jet nozzle has a direct effect on the noise of spherical tuyeres. The addition of a serrated structure to the trailing edge of a spherical tuyere is proposed to reduce the jet noise. A full-scale test bed is built to verify the jet velocity distribution of the spherical tuyere, and the tuyere jet noise prediction is verified through analogy experiments. The large eddy simulation (LES) model and Ffowcs Williams–Hawkings (FW–H) equation are used to predict the jet flow field and jet noise, respectively. The results show that the serrated trailing edge reduces the velocity attenuation and turbulent kinetic energy (TKE) on the downstream axis of the jet, and the radiated noise is significantly reduced at 10–60 Hz. However, when the serration width is excessively large, the serration increases the radiated sound pressure level (SPL) of the tuyere. In addition, optimal serration parameters can be used to reduce the effect of tuyere radiation noise on the standing and sitting postures of residents. The maximum radiated overall SPL can be reduced by 3.78 dB at the sitting height. The simulation data and analysis results can provide reference for the low-noise optimization design of spherical tuyeres.

喷嘴的几何形状对球形风口的噪音有直接影响。建议在球形风口的后缘增加锯齿状结构以降低喷射噪声。搭建全尺寸试验台验证球形风口射流速度分布，并通过类比实验验证风口射流噪声预测。大涡模拟 (LES) 模型和 Ffowcs Williams-Hawkings (FW-H) 方程分别用于预测射流流场和射流噪声。结果表明，锯齿状后缘降低了射流下游轴上的速度衰减和湍动能（TKE），辐射噪声在 10-60 Hz 时显着降低。但是，当锯齿宽度过大时，锯齿会增加风口的辐射声压级 (SPL)。此外，可以通过优化锯齿参数来降低风口辐射噪声对居民站立和坐姿的影响。在坐高处，最大辐射整体 SPL 可降低 3.78 dB。仿真数据和分析结果可为球形风口的低噪声优化设计提供参考。