ABSTRACT

A rectangular inlet generally exceeds a circular inlet in separation performance. However, there still lacks detailed information that can appropriately determine the height-to-width ratio of the rectangular inlet. For this reason, this study investigated the effect of the height-to-width ratio of the rectangular inlet on the separation performance of hydrocyclone with a diameter of 75 mm through numerical analysis. The numerical results fitted well with the experimental data and thus validated the effectiveness of the present method. The appropriate height-to-width ratio was determined by overall analyzing the pressure field, the velocity field, the air column, the turbulence field in the hydrocyclone and the separation efficiency. Based on the present research results, as the height-to-width ratio increased, both the pressure drop and tangential velocity first increased and then decreased, while the turbulence energy first decreased and then increased. At a height-to-width ratio of 3, the short-circuit flow rate and the turbulence energy were lowest and the separation precision was highest, suggesting favorable product quality. Conclusively, for the hydrocyclone with a diameter of 75 mm, the optimal height-to-width ratio of the rectangular inlet should be within the range of 3~4. This finding can provide insightful foundation for designing a reasonable inlet.

摘要

矩形入口的分离性能通常超过圆形入口。但是，仍然缺乏可以适当确定矩形入口的高宽比的详细信息。为此，本研究通过数值分析研究了矩形进口高宽比对直径为75 mm的旋流器分离性能的影响。数值结果与实验数据吻合较好，验证了本方法的有效性。通过对水力旋流器中的压力场、速度场、气柱、湍流场和分离效率的综合分析，确定了合适的高宽比。根据目前的研究结果，随着高宽比的增加，压力降和切向速度均先增大后减小，湍流能量先减小后增大。在高宽比为3时，短路流量和湍流能量最低，分离精度最高，表明产品质量良好。综上所述，对于直径为 75 mm 的水力旋流器，矩形进口的最佳高宽比应在 3~4 范围内。这一发现可以为设计合理的入口提供有见地的基础。综上所述，对于直径为 75 mm 的水力旋流器，矩形进口的最佳高宽比应在 3~4 范围内。这一发现可以为设计合理的入口提供有见地的基础。综上所述，对于直径为 75 mm 的水力旋流器，矩形进口的最佳高宽比应在 3~4 范围内。这一发现可以为设计合理的入口提供有见地的基础。