Scarfing applications cause severe noise pollution in metallurgical engineering. To determine the noise characteristics generated by parallel multiple impinging jets in the slab scarfing process, a physical experiment is performed, and a 3D mathematical model is established. Mutual attraction of the parallel multiple jets is recorded, and its influence on the acoustic properties is revealed. The effects of impact height, impact angle, and Reynolds number on the multi‐jet impingement are analyzed. The results indicate that the parallel multiple jets combine in pairs in the upstream. The multi‐jet impingement increases the magnitude of dipole acoustic source, and the noise directivity presents two peaks above the impacted surface. As the impact height increases, the noise intensity first increases to later decrease, and the noise propagation is deflected along the axial direction. As the impact angle decreases, the noise intensity gradually increases, and the spectrum shifts toward higher frequencies. The jet Reynolds number only affects the noise intensity, but has little influence on the spectrum and directivity. The results of this research may provide a theoretical basis for the formulation of guidelines to reduce noise pollution in slab scarfing processes.

中文翻译：

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平行多喷口斜向撞击在平板钢坯中的实验与数值分析

刮擦的应用会在冶金工程中造成严重的噪声污染。为了确定在平板刮除过程中由平行的多次冲击射流产生的噪声特性，进行了物理实验，并建立了3D数学模型。记录平行的多个射流的相互吸引，并揭示其对声学特性的影响。分析了撞击高度，撞击角度和雷诺数对多喷嘴撞击的影响。结果表明，平行的多个射流在上游成对结合。多喷流撞击增加了偶极声源的强度，并且噪声方向性在受灾表面上方出现了两个峰值。随着撞击高度的增加，噪声强度会先增加后降低。噪声传播沿轴向偏转。随着冲击角的减小，噪声强度逐渐增加，并且频谱向更高的频率偏移。雷诺数仅影响噪声强度，而对频谱和方向性影响很小。这项研究的结果可为制定准则以减少板坯刮除过程中的噪声污染提供理论依据。